Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records
Area code 406 prefixes
754 of the 786 possible NXX blocks are assigned in area code 406 (95.9% of capacity), spread across 260 rate centers and 63 holders. The largest holders are QWEST CORPORATION (132 blocks, 17.5%), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (119 blocks, 15.8%), NEW CINGULAR WIRELESS PCS, LLC (74 blocks, 9.8%). Grouped by brand, Lumen accounts for 185 blocks; brand-attributable holders cover 65% of the code, and the rest are CLECs, VoIP wholesalers and regional carriers that trade under their own names. The assignment records here run from 2001-04-18 to 2026-06-05, with 18 blocks handed out in 2003 alone. 527 blocks (70%) are in thousands-block pooling, meaning the block is shared between carriers in 1,000-number lots rather than held whole – which is why a single NXX can serve several carriers at once. 64 were growth assignments – additional blocks to a carrier that had already filled its earlier ones.
754 assigned blocks of 786
260 rate centers
63 holders of record
70% in thousands-block pooling
Largest holders in 406
| Holder of record, as NANPA names it | Brand | Blocks | Share |
|---|---|---|---|
| QWEST CORPORATION | Lumen | 132 | 17.5% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | Verizon | 119 | 15.8% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 74 | 9.8% |
| ONVOY, LLC - MT | Onvoy | 43 | 5.7% |
| TRIANGLE TEL. COOP. ASSN., INC. | – | 39 | 5.2% |
| NEMONT TEL COOP INC | – | 33 | 4.4% |
| LEVEL 3 COMMUNICATIONS, LLC - MT | Lumen | 27 | 3.6% |
| MID-RIVERS TEL. COOP., INC. | – | 27 | 3.6% |
| 3 RIVERS TEL. COOP., INC. | – | 26 | 3.4% |
| CHARTER IP ENABLED SERVICES, LLC | Charter | 26 | 3.4% |
| BLACKFOOT TEL. COOP., INC. | – | 22 | 2.9% |
| CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK | Lumen | 21 | 2.8% |
Names are printed as they appear in the assignment records, which is the legal entity rather than the brand. Holding a block is not the same as serving the numbers in it: portability moves numbers between carriers and pooling splits a block between several.
Rate centers with their own page
Rate centers where at least three blocks are assigned, excluding the numbered metro zone codes. The remainder are in the full table below.
BILLINGS 72MISSOULA 47HELENA 38GREATFALLS 37BOZEMAN 32KALISPELL 25BUTTE 17MILES CITY 10SIDNEY 9LIVINGSTON 8LEWISTOWN 8HAMILTON 8HAVRE 7SHELBY 7DILLON 7HARDIN 7LIBBY 6COLUMBUS 6GLENDIVE 6RED LODGE 6LAUREL 6FORSYTH 5COLSTRIP 5CONRAD 5ANACONDA 5BOULDER 4GLASGOW 4CUT BANK 4TOWNSEND 4MANHATTAN 4POLSON 4ROUNDUP 4BELGRADE 4WHITEFISH 4W GLENDIVE 4BAKER 4SEELEYLAKE 3THOMPSNFLS 3ST REGIS 3PABLO 3EUREKARURL 3MALTA 3SUPERIOR 3SOUTHHAVRE 3DEER LODGE 3BIGFORK 3CULBERTSON 3RONAN 3TERRY 3WYELLOWSTN 3FROMBERG 3STIGNATIUS 3COLUMBIFLS 3BIG TIMBER 3BIG SKY 3
All 754 assigned blocks
One row per NXX. “Pooled” means carriers draw 1,000-number lots from the block rather than holding all 10,000, so a pooled prefix can belong to several carriers at once. “Not in service” means assigned but not yet open for calls – a caller ID from one of those is necessarily spoofed. The holder column gives the brand where the legal entity maps to one; the full legal names are in the holders table above, exactly as NANPA records them.
| Prefix | Holder of record | Rate center | Assigned | Pooled | In service |
|---|---|---|---|---|---|
| 406-200 | AT&T | BILLINGS | 2012-04-17 | yes | yes |
| 406-201 | AT&T | FORSYTH | 2003-01-21 | yes | yes |
| 406-202 | AT&T | HELENA | 2001-04-18 | yes | yes |
| 406-203 | Lumen | MISSOULA | – | yes | yes |
| 406-204 | Lumen | HELENA | – | yes | yes |
| 406-205 | Lumen | GREATFALLS | – | yes | yes |
| 406-206 | Lumen | BILLINGS | – | – | yes |
| 406-207 | AT&T | MISSOULA | 2001-04-18 | yes | yes |
| 406-208 | AT&T | BILLINGS | 2001-04-18 | yes | yes |
| 406-209 | AT&T | BOZEMAN | 2001-04-18 | yes | yes |
| 406-210 | Verizon | SEELEYLAKE | – | yes | yes |
| 406-212 | AT&T | KALISPELL | 2001-04-18 | yes | yes |
| 406-213 | Lumen | COLSTRIP | 2003-05-06 | yes | yes |
| 406-214 | Verizon | MISSOULA | – | yes | yes |
| 406-215 | SKYE TELECOM LLC DBA SKYETEL | MISSOULA | – | yes | yes |
| 406-216 | 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT | GREATFALLS | – | yes | yes |
| 406-217 | Verizon | GREATFALLS | – | yes | yes |
| 406-218 | T-Mobile | MISSOULA | 2004-08-03 | yes | yes |
| 406-219 | Bandwidth | BOZEMAN | 2003-02-13 | yes | yes |
| 406-220 | AT&T | LIVINGSTON | – | yes | yes |
| 406-221 | Onvoy | BUTTE | 2003-02-13 | yes | yes |
| 406-222 | Lumen | LIVINGSTON | – | – | yes |
| 406-223 | Verizon | LIVINGSTON | – | – | yes |
| 406-224 | Verizon | LIVINGSTON | – | yes | yes |
| 406-225 | Lumen | BOULDER | – | yes | yes |
| 406-226 | Lumen | EGLACIERPK | – | yes | yes |
| 406-227 | Lumen | HELENA | – | – | yes |
| 406-228 | NEMONT TEL COOP INC | GLASGOW | – | yes | yes |
| 406-229 | AT&T | CUT BANK | 2003-01-20 | yes | yes |
| 406-230 | Verizon | GLASGOW | – | yes | yes |
| 406-231 | AT&T | GREATFALLS | 2001-07-12 | yes | yes |
| 406-232 | Lumen | MILES CITY | – | – | yes |
| 406-233 | Lumen | MILES CITY | – | yes | yes |
| 406-234 | MID-RIVERS TELEPHONE COOPERATIVE, INC. | MILES CITY | – | – | yes |
| 406-235 | Lumen | WOLF CREEK | – | yes | yes |
| 406-236 | 3 RIVERS TEL. COOP., INC. | NEIHART | – | – | yes |
| 406-237 | Lumen | BILLINGS | – | – | yes |
| 406-238 | Lumen | BILLINGS | – | – | yes |
| 406-239 | AT&T | MISSOULA | – | yes | yes |
| 406-240 | AT&T | MISSOULA | – | – | yes |
| 406-241 | AT&T | MISSOULA | – | yes | yes |
| 406-242 | AT&T | THOMPSNFLS | 2003-03-18 | yes | yes |
| 406-243 | Lumen | MISSOULA | – | – | yes |
| 406-244 | BLACKFOOT TEL. COOP., INC. | POTOMAC | – | – | yes |
| 406-245 | Lumen | BILLINGS | – | – | yes |
| 406-246 | BLACKFOOT TEL. COOP., INC. | DIXON | – | – | yes |
| 406-247 | Lumen | BILLINGS | – | yes | yes |
| 406-248 | Lumen | BILLINGS | – | yes | yes |
| 406-249 | Verizon | KALISPELL | – | – | yes |
| 406-250 | Verizon | KALISPELL | – | – | yes |
| 406-251 | Lumen | MISSOULA | – | – | yes |
| 406-252 | Lumen | BILLINGS | – | – | yes |
| 406-253 | AT&T | KALISPELL | – | – | yes |
| 406-254 | Lumen | BILLINGS | – | – | yes |
| 406-255 | Lumen | BILLINGS | – | – | yes |
| 406-256 | Lumen | BILLINGS | – | – | yes |
| 406-257 | Lumen | KALISPELL | – | – | yes |
| 406-258 | Lumen | MISSOULA | – | yes | yes |
| 406-259 | Lumen | BILLINGS | – | – | yes |
| 406-260 | AT&T | KALISPELL | – | yes | yes |
| 406-261 | AT&T | KALISPELL | – | yes | yes |
| 406-262 | Lumen | HAVRE | – | yes | yes |
| 406-263 | SAGEBRUSH CELLULAR, INC. | GLASGOW | – | – | yes |
| 406-264 | 3 RIVERS TEL. COOP., INC. | FORT SHAW | – | – | yes |
| 406-265 | Lumen | HAVRE | – | – | yes |
| 406-266 | Lumen | TOWNSEND | – | yes | yes |
| 406-267 | SOUTHERN MONTANA TEL. CO. | DIVIDE | – | – | yes |
| 406-268 | Lumen | GREATFALLS | – | yes | yes |
| 406-269 | AT&T | ST REGIS | 2010-10-12 | yes | yes |
| 406-270 | Verizon | KALISPELL | – | – | yes |
| 406-271 | 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT | CONRAD | – | yes | yes |
| 406-272 | Onvoy | BILLINGS | – | yes | yes |
| 406-273 | Lumen | MISSOULA | – | yes | yes |
| 406-274 | AT&T | MISSOULA | – | yes | yes |
| 406-275 | RONAN TEL. CO. | PABLO | – | – | yes |
| 406-276 | 3 RIVERS TEL. COOP., INC. | LIMA | – | yes | yes |
| 406-277 | 3 RIVERS TEL. COOP., INC. | BELT | – | – | yes |
| 406-278 | Lumen | CONRAD | – | yes | yes |
| 406-279 | 3 RIVERS TEL. COOP., INC. | VALIER | – | – | yes |
| 406-280 | AT&T | ST REGIS | 2003-03-18 | yes | yes |
| 406-281 | AT&T | BILLINGS | – | yes | yes |
| 406-282 | Lumen | MANHATTAN | – | yes | yes |
| 406-283 | Ziply Fiber | LIBBY | – | yes | yes |
| 406-284 | Lumen | MANHATTAN | – | yes | yes |
| 406-285 | Lumen | THREEFORKS | – | yes | yes |
| 406-286 | NEMONT TEL COOP INC | RESERVE | – | yes | yes |
| 406-287 | Lumen | WHITEHALL | – | yes | yes |
| 406-288 | BLACKFOOT TEL. COOP., INC. | DRUMMOND | – | – | yes |
| 406-289 | AT&T | CONRAD | – | yes | yes |
| 406-290 | Onvoy | COLUMBUS | 2007-03-14 | yes | yes |
| 406-291 | Verizon | LIBBY | – | yes | yes |
| 406-292 | TRIANGLE TEL. COOP. ASSN., INC. | JOPLIN | – | yes | yes |
| 406-293 | Ziply Fiber | LIBBY | – | yes | yes |
| 406-294 | Allstream | BILLINGS | – | – | yes |
| 406-295 | Ziply Fiber | TROY | – | yes | yes |
| 406-296 | Ziply Fiber | EUREKA | – | yes | yes |
| 406-297 | INTERBEL TELEPHONE COOPERATIVE, INC. - MT | EUREKARURL | – | – | yes |
| 406-298 | Verizon | COLUMBUS | – | yes | yes |
| 406-299 | Lumen | BUTTE | 2003-01-23 | yes | yes |
| 406-300 | Charter | KALISPELL | 2013-07-17 | yes | yes |
| 406-301 | Verizon | MALTA | 2008-05-06 | yes | yes |
| 406-302 | Onvoy | WOLF CREEK | 2011-10-03 | yes | yes |
| 406-303 | AT&T | MISSOULA | 2012-04-17 | yes | yes |
| 406-304 | T-Mobile | MISSOULA | 2016-03-25 | yes | yes |
| 406-305 | AT&T | WHSLPHRSPG | 2010-10-20 | yes | yes |
| 406-306 | Onvoy | MANHATTAN | 2017-10-20 | yes | yes |
| 406-307 | Charter | CANYON CRK | 2025-03-18 | yes | yes |
| 406-308 | Verizon | CASCADE | 2017-09-05 | yes | yes |
| 406-309 | Charter | KALISPELL | 2011-07-01 | yes | yes |
| 406-310 | BLACKFOOT COMMUNICATIONS, INC. - MT | BUTTE | – | yes | yes |
| 406-312 | NUSO, LLC | BOZEMAN | – | yes | yes |
| 406-313 | Onvoy | BOULDER | 2012-11-16 | yes | yes |
| 406-314 | AT&T | KALISPELL | 2004-10-21 | yes | yes |
| 406-315 | SAGEBRUSH CELLULAR, INC. | GREATFALLS | – | yes | yes |
| 406-316 | Onvoy | BOULDER | 2019-07-12 | yes | yes |
| 406-317 | Telnyx | MISSOULA | – | yes | yes |
| 406-318 | Onvoy | BILLINGS | 2011-02-17 | yes | yes |
| 406-319 | Charter | POLSON | – | yes | yes |
| 406-320 | Verizon | ROUNDUP | – | yes | yes |
| 406-321 | AT&T | COLUMBUS | – | yes | yes |
| 406-322 | Lumen | COLUMBUS | – | yes | yes |
| 406-323 | MID-RIVERS TEL. COOP., INC. | ROUNDUP | – | yes | yes |
| 406-324 | Lumen | HELENA | – | yes | yes |
| 406-325 | NUSO, LLC | BILLINGS | – | yes | yes |
| 406-326 | TRIANGLE TEL. COOP. ASSN., INC. | REEDPOINT | – | – | yes |
| 406-327 | Lumen | MISSOULA | – | – | yes |
| 406-328 | PROJECT TEL. CO., INC. | ABSAROKEE | – | yes | yes |
| 406-329 | Lumen | MISSOULA | – | – | yes |
| 406-330 | Charter | CLINTON | – | yes | yes |
| 406-331 | Verizon | ROUNDUP | – | yes | yes |
| 406-332 | BLACKFOOT TEL. COOP., INC. | PABLO | – | yes | yes |
| 406-333 | Lumen | LIVINGSTON | – | yes | yes |
| 406-334 | AT&T | LIBBY | 2004-05-10 | yes | yes |
| 406-335 | NORTHERN TEL. COOP., INC. | SWEETGRASS | – | – | yes |
| 406-336 | NORTHERN TEL. COOP., INC. | NOCUT BANK | – | – | yes |
| 406-337 | NORTHERN TEL. COOP., INC. | KEVINOLMNT | – | – | yes |
| 406-338 | SIYEH COMMUNICATIONS | BROWNING | – | yes | yes |
| 406-339 | NORTHERN TEL. COOP., INC. | ETHRIDGE | – | – | yes |
| 406-340 | AT&T | LIMA | – | yes | yes |
| 406-341 | Onvoy | MANHATTAN | 2020-07-06 | yes | yes |
| 406-342 | RANGE TEL COOP INC | HYSHAM | – | yes | yes |
| 406-343 | PROJECT TEL. CO., INC. | WYOLA | – | yes | yes |
| 406-344 | Verizon | HAVRE | – | yes | yes |
| 406-345 | MID-RIVERS TELEPHONE COOPERATIVE, INC. | GLENDIVE | – | yes | yes |
| 406-346 | RANGE TELEPHONE COOPERATIVE, INC. - MT | FORSYTH | 2002-07-11 | yes | yes |
| 406-347 | RANGE TEL COOP INC | ROSEBUD | – | – | yes |
| 406-348 | PROJECT TEL. CO., INC. | HUNTLEY | – | yes | yes |
| 406-349 | BLACKFOOT TEL. COOP., INC. | ALTA | – | – | yes |
| 406-350 | AT&T | LEWISTOWN | – | yes | yes |
| 406-351 | Verizon | FORSYTH | – | yes | yes |
| 406-352 | TRIANGLE TEL. COOP. ASSN., INC. | BOX ELDER | – | – | yes |
| 406-353 | TRIANGLE TEL. COOP. ASSN., INC. | HARLEM | – | yes | yes |
| 406-354 | MID-RIVERS TEL. COOP., INC. | ROCK SPG | – | – | yes |
| 406-355 | TRIANGLE TEL. COOP. ASSN., INC. | RUDYARD | – | – | yes |
| 406-356 | Lumen | FORSYTH | – | yes | yes |
| 406-357 | TRIANGLE TEL. COOP. ASSN., INC. | CHINOOK | – | yes | yes |
| 406-358 | MID-RIVERS TEL. COOP., INC. | MELSTONE | – | – | yes |
| 406-359 | Lumen | GLENDIVE | – | yes | yes |
| 406-360 | Verizon | HAMILTON | – | – | yes |
| 406-361 | Verizon | HAMILTON | 2011-06-09 | yes | yes |
| 406-362 | LINCOLN TEL. CO., INC. | LINCOLN | – | – | yes |
| 406-363 | Lumen | HAMILTON | – | yes | yes |
| 406-364 | NEMONT TEL COOP INC | HINSDALE | – | – | yes |
| 406-365 | Lumen | GLENDIVE | – | yes | yes |
| 406-366 | Verizon | LEWISTOWN | – | yes | yes |
| 406-367 | NEMONT TEL COOP INC | NO GLASGOW | – | – | yes |
| 406-368 | LINCOLN TEL. CO., INC. | CANYON CRK | – | – | yes |
| 406-369 | AT&T | HAMILTON | – | yes | yes |
| 406-370 | Verizon | MISSOULA | – | – | yes |
| 406-371 | Verizon | BILLINGS | 2004-07-27 | yes | yes |
| 406-372 | TRIANGLE TEL. COOP. ASSN., INC. | KREMLIN | – | – | yes |
| 406-373 | Lumen | BILLINGS | – | yes | yes |
| 406-374 | TRIANGLE TEL. COOP. ASSN., INC. | MOORE | – | – | yes |
| 406-375 | Lumen | HAMILTON | – | yes | yes |
| 406-376 | TRIANGLE TEL. COOP. ASSN., INC. | GILDFORD | – | – | yes |
| 406-377 | MID-RIVERS TELEPHONE COOPERATIVE, INC. | GLENDIVE | – | – | yes |
| 406-378 | TRIANGLE TEL. COOP. ASSN., INC. | BIG SANDY | – | yes | yes |
| 406-379 | TRIANGLE TEL. COOP. ASSN., INC. | TURNER | – | – | yes |
| 406-380 | Verizon | LEWISTOWN | – | yes | yes |
| 406-381 | Verizon | HAMILTON | – | – | yes |
| 406-382 | AT&T | SUPERIOR | 2003-03-18 | yes | yes |
| 406-383 | TRIANGLE TEL. COOP. ASSN., INC. | DODSON | – | – | yes |
| 406-384 | Allstream | BILLINGS | – | yes | yes |
| 406-385 | NEMONT TEL COOP INC | WESTBY | – | yes | yes |
| 406-386 | TRIANGLE TEL. COOP. ASSN., INC. | HOPPILLIAD | – | – | yes |
| 406-387 | Lumen | HUNGRYHORS | – | yes | yes |
| 406-388 | Lumen | BELGRADE | – | – | yes |
| 406-389 | Lumen | HELENA | 2013-09-18 | yes | yes |
| 406-390 | Verizon | SOUTHHAVRE | – | yes | yes |
| 406-391 | AT&T | CUT BANK | – | yes | yes |
| 406-392 | NEMONT TEL COOP INC | NO WOLF PT | – | yes | yes |
| 406-393 | Charter | SOMERS | 2006-03-30 | yes | yes |
| 406-394 | TRIANGLE TEL. COOP. ASSN., INC. | NORTHHAVRE | – | yes | yes |
| 406-395 | TRIANGLE TEL. COOP. ASSN., INC. | SOUTHHAVRE | – | yes | yes |
| 406-396 | Verizon | MISSOULA | 2003-11-26 | – | yes |
| 406-397 | TRIANGLE TEL. COOP. ASSN., INC. | HINGHAM | – | – | yes |
| 406-398 | TRIANGLE TEL. COOP. ASSN., INC. | NORTHHAVRE | – | yes | yes |
| 406-399 | Verizon | SOUTHHAVRE | – | yes | yes |
| 406-400 | TRIANGLE COMMUNICATION SYSTEM, INC. - MT- | HAVRE | 2017-04-27 | yes | yes |
| 406-401 | CSC WIRELESS, LLC | GREATFALLS | 2019-05-29 | yes | yes |
| 406-402 | T-Mobile | GREATFALLS | 2017-08-04 | yes | yes |
| 406-403 | Onvoy | GREATFALLS | 2006-03-08 | yes | yes |
| 406-404 | Charter | BOZEMAN | 2012-04-03 | yes | yes |
| 406-405 | Onvoy | LIBBY | 2022-09-08 | yes | yes |
| 406-406 | LIVEWIRE TELECOM, LLC | MISSOULA | 2024-12-09 | yes | yes |
| 406-407 | Verizon | KALISPELL | 2010-08-16 | yes | yes |
| 406-408 | Verizon | HAYS | 2019-10-15 | yes | yes |
| 406-409 | CSC WIRELESS, LLC | BILLINGS | 2019-05-29 | yes | yes |
| 406-410 | Verizon | HELENA | – | yes | yes |
| 406-412 | Onvoy | BILLINGS | 2017-05-22 | yes | yes |
| 406-413 | Lumen | BILLINGS | 2015-05-12 | yes | yes |
| 406-414 | Lumen | BOZEMAN | 2011-12-07 | yes | yes |
| 406-415 | Charter | DEER LODGE | 2010-04-09 | yes | yes |
| 406-416 | Onvoy | FORSYTH | 2020-06-17 | yes | yes |
| 406-417 | AT&T | HELENA | 2008-05-28 | yes | yes |
| 406-418 | Onvoy | COOKE CITY | 2019-08-20 | yes | yes |
| 406-419 | Onvoy | VICTOR | 2019-07-12 | yes | yes |
| 406-420 | Charter | BIGFORK | 2006-02-28 | yes | yes |
| 406-421 | RANGE TEL COOP INC | SOMILES CY | – | yes | yes |
| 406-422 | Charter | HELENA | – | yes | yes |
| 406-423 | TRIANGLE TEL. COOP. ASSN., INC. | HOBSON | – | – | yes |
| 406-424 | 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT | SHELBY | 2001-11-12 | yes | yes |
| 406-425 | Verizon | RED LODGE | – | yes | yes |
| 406-426 | Verizon | RED LODGE | – | yes | yes |
| 406-427 | RANGE TEL COOP INC | SO BROADUS | – | – | yes |
| 406-428 | MID-RIVERS TEL. COOP., INC. | GRASSRANGE | – | yes | yes |
| 406-429 | MID-RIVERS TEL. COOP., INC. | WINNETT | – | yes | yes |
| 406-430 | Onvoy | HELENA | – | yes | yes |
| 406-431 | Verizon | HELENA | – | – | yes |
| 406-432 | NORTHERN TEL. COOP., INC. | DEVON | – | – | yes |
| 406-433 | MID-RIVERS TELEPHONE COOPERATIVE, INC. | SIDNEY | – | – | yes |
| 406-434 | Lumen | SHELBY | – | yes | yes |
| 406-435 | TDS | BILLINGS | – | yes | yes |
| 406-436 | RANGE TEL COOP INC | BROADUS | – | yes | yes |
| 406-437 | Verizon | HELENA | 2004-07-27 | yes | yes |
| 406-438 | Verizon | HELENA | 2014-02-06 | yes | yes |
| 406-439 | AT&T | HELENA | – | yes | yes |
| 406-440 | 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT | HELENA | 2005-07-01 | yes | yes |
| 406-441 | Lumen | HELENA | – | – | yes |
| 406-442 | Lumen | HELENA | – | – | yes |
| 406-443 | Lumen | HELENA | – | – | yes |
| 406-444 | Lumen | HELENA | – | – | yes |
| 406-445 | Lumen | RED LODGE | – | yes | yes |
| 406-446 | Lumen | RED LODGE | – | yes | yes |
| 406-447 | Lumen | HELENA | – | yes | yes |
| 406-448 | NEMONT TEL COOP INC | NO POPLAR | – | yes | yes |
| 406-449 | Lumen | HELENA | – | – | yes |
| 406-450 | Verizon | SHELBY | – | yes | yes |
| 406-451 | T-Mobile | BOZEMAN | 2004-08-04 | yes | yes |
| 406-452 | Lumen | GREATFALLS | – | – | yes |
| 406-453 | Lumen | GREATFALLS | – | – | yes |
| 406-454 | Lumen | GREATFALLS | – | – | yes |
| 406-455 | Lumen | GREATFALLS | – | yes | yes |
| 406-456 | TRIANGLE TEL. COOP. ASSN., INC. | SO CHESTER | – | – | yes |
| 406-457 | Lumen | HELENA | – | yes | yes |
| 406-458 | Lumen | HELENA | – | yes | yes |
| 406-459 | Verizon | HELENA | – | – | yes |
| 406-460 | AT&T | SHELBY | – | yes | yes |
| 406-461 | Verizon | HELENA | – | – | yes |
| 406-462 | TRIANGLE TEL. COOP. ASSN., INC. | WINIFRED | – | – | yes |
| 406-463 | 3 RIVERS TEL. COOP., INC. | POWER | – | – | yes |
| 406-464 | MID-RIVERS TEL. COOP., INC. | ROY | – | yes | yes |
| 406-465 | Verizon | HELENA | – | – | yes |
| 406-466 | 3 RIVERS TEL. COOP., INC. | CHOTEAU | – | yes | yes |
| 406-467 | 3 RIVERS TEL. COOP., INC. | FAIRFIELD | – | yes | yes |
| 406-468 | Lumen | CASCADE | – | yes | yes |
| 406-469 | 3 RIVERS TEL. COOP., INC. | PENDROY | – | – | yes |
| 406-470 | Verizon | SHELBY | – | yes | yes |
| 406-471 | Verizon | KALISPELL | 2005-06-01 | – | yes |
| 406-472 | 3 RIVERS TEL. COOP., INC. | DUPUYER | – | – | yes |
| 406-473 | TRIANGLE TEL. COOP. ASSN., INC. | JUDITH GAP | – | – | yes |
| 406-474 | NEMONT TEL COOP INC | FLAXVILLE | – | – | yes |
| 406-475 | Lumen | HELENA | – | yes | yes |
| 406-476 | Lumen | DUTTON | – | yes | yes |
| 406-477 | RANGE TEL COOP INC | LAME DEER | – | yes | yes |
| 406-478 | Verizon | SIDNEY | – | yes | yes |
| 406-479 | Verizon | BUTTE | 2013-10-03 | yes | yes |
| 406-480 | Verizon | SIDNEY | – | yes | yes |
| 406-481 | Verizon | MISSOULA | 2023-06-21 | yes | yes |
| 406-482 | Lumen | SIDNEY | – | yes | yes |
| 406-483 | NEMONT TEL COOP INC | DAGMAR | – | – | yes |
| 406-484 | TRI-COUNTY TEL. ASSN., INC. | CROOKEDCRK | – | yes | yes |
| 406-485 | MID-RIVERS TEL. COOP., INC. | CIRCLE | – | yes | yes |
| 406-486 | MID-RIVERS TEL. COOP., INC. | FALLON | – | – | yes |
| 406-487 | NEMONT TEL COOP INC | SCOBEY | – | yes | yes |
| 406-488 | MID-RIVERS TELEPHONE COOPERATIVE, INC. | SIDNEY | – | – | yes |
| 406-489 | AT&T | SIDNEY | – | yes | yes |
| 406-490 | Verizon | BUTTE | – | – | yes |
| 406-491 | AT&T | BUTTE | – | yes | yes |
| 406-492 | BLACKFOOT TEL. COOP., INC. | AVON | – | – | yes |
| 406-493 | Charter | MISSOULA | – | yes | yes |
| 406-494 | Lumen | BUTTE | – | – | yes |
| 406-495 | Lumen | HELENA | – | yes | yes |
| 406-496 | Lumen | BUTTE | – | yes | yes |
| 406-497 | Lumen | BUTTE | – | yes | yes |
| 406-498 | Verizon | BUTTE | – | – | yes |
| 406-499 | AT&T | SEELEYLAKE | 2003-03-18 | yes | yes |
| 406-500 | FRACTEL, LLC | BILLINGS | 2019-01-29 | yes | yes |
| 406-501 | Onvoy | WHITEHALL | 2019-08-20 | yes | yes |
| 406-502 | Charter | HELENA | 2012-04-03 | yes | yes |
| 406-503 | Comcast | BILLINGS | 2023-04-05 | yes | yes |
| 406-504 | Lumen | FAIRFIELD | 2021-02-12 | yes | yes |
| 406-505 | AT&T | CONRAD | 2010-10-14 | yes | yes |
| 406-506 | HD CARRIER LLC | BILLINGS | 2020-06-01 | yes | yes |
| 406-507 | Lumen | WHITEFISH | 2023-02-17 | yes | yes |
| 406-508 | Lumen | FRENCHTOWN | 2012-02-03 | yes | yes |
| 406-509 | EXIANT COMMUNICATIONS LLC | MISSOULA | 2026-06-05 | yes | yes |
| 406-510 | Onvoy | MISSOULA | 2017-03-22 | yes | yes |
| 406-512 | Lumen | BOULDER | 2023-02-22 | yes | yes |
| 406-513 | Charter | HELENA | 2008-04-08 | yes | yes |
| 406-514 | AT&T | CULBERTSON | 2010-10-20 | yes | yes |
| 406-515 | AT&T | SUPERIOR | 2010-10-12 | yes | yes |
| 406-516 | Dish | LAUREL | 2023-04-27 | yes | yes |
| 406-517 | Verizon | LIVINGSTON | 2024-06-07 | yes | yes |
| 406-518 | Onvoy | GALATNGTWY | 2011-09-27 | yes | yes |
| 406-519 | IP HORIZON LLC | MISSOULA | – | yes | yes |
| 406-520 | HD CARRIER LLC | ABSAROKEE | – | yes | yes |
| 406-521 | Verizon | TOWNSEND | – | yes | yes |
| 406-522 | Lumen | BOZEMAN | – | – | yes |
| 406-523 | Lumen | MISSOULA | – | – | yes |
| 406-524 | NEMONT TEL COOP INC | VLINSTRLPK | – | yes | yes |
| 406-525 | MID-RIVERS TEL. COOP., INC. | SO WOLF PT | – | yes | yes |
| 406-526 | NEMONT TEL COOP INC | FORT PECK | – | yes | yes |
| 406-527 | NEMONT TEL COOP INC | SACO | – | yes | yes |
| 406-528 | RONAN TEL. CO. | RONAN | – | – | yes |
| 406-529 | Verizon | MISSOULA | 2005-09-16 | – | yes |
| 406-530 | Lumen | LAUREL | – | yes | yes |
| 406-531 | Verizon | MISSOULA | – | – | yes |
| 406-532 | BLACKFOOT COMMUNICATIONS, INC. - MT | MISSOULA | – | – | yes |
| 406-533 | Lumen | BUTTE | – | yes | yes |
| 406-534 | Charter | BILLINGS | – | yes | yes |
| 406-535 | MID-RIVERS TELEPHONE COOPERATIVE, INC. | LEWISTOWN | – | – | yes |
| 406-536 | AT&T | BOZEMAN | 2024-12-18 | yes | yes |
| 406-537 | TRIANGLE TEL. COOP. ASSN., INC. | MELVILLE | – | – | yes |
| 406-538 | Lumen | LEWISTOWN | – | yes | yes |
| 406-539 | AT&T | BOZEMAN | – | – | yes |
| 406-540 | Onvoy | MISSOULA | – | yes | yes |
| 406-541 | BLACKFOOT COMMUNICATIONS, INC. - MT | MISSOULA | – | – | yes |
| 406-542 | Lumen | MISSOULA | – | – | yes |
| 406-543 | Lumen | MISSOULA | – | – | yes |
| 406-544 | Verizon | MISSOULA | – | – | yes |
| 406-545 | Lumen | BILLINGS | 2002-06-19 | yes | yes |
| 406-546 | Verizon | MISSOULA | – | – | yes |
| 406-547 | TRIANGLE TEL. COOP. ASSN., INC. | WHSLPHRSPG | – | yes | yes |
| 406-548 | Lumen | BOZEMAN | – | yes | yes |
| 406-549 | Lumen | MISSOULA | – | – | yes |
| 406-550 | NUSO, LLC | MISSOULA | – | yes | yes |
| 406-551 | Lumen | BOZEMAN | 2002-06-19 | yes | yes |
| 406-552 | Lumen | MISSOULA | 2002-06-19 | yes | yes |
| 406-553 | AT&T | DIVIDE | – | yes | yes |
| 406-554 | RANGE TEL COOP INC | NO BROADUS | – | – | yes |
| 406-556 | Lumen | BOZEMAN | – | – | yes |
| 406-557 | MID-RIVERS TEL. COOP., INC. | JORDAN | – | yes | yes |
| 406-558 | Verizon | HELENA | 2002-06-19 | yes | yes |
| 406-559 | Verizon | ANACONDA | – | yes | yes |
| 406-560 | Verizon | ANACONDA | – | yes | yes |
| 406-561 | T-Mobile | BILLINGS | 2017-08-02 | yes | yes |
| 406-562 | 3 RIVERS TEL. COOP., INC. | AUGUSTA | – | – | yes |
| 406-563 | Lumen | ANACONDA | – | yes | yes |
| 406-564 | Lumen | GREATFALLS | 2002-06-19 | yes | yes |
| 406-565 | Lumen | BUTTE | 2002-06-19 | yes | yes |
| 406-566 | TRIANGLE TEL. COOP. ASSN., INC. | STANFORD | – | yes | yes |
| 406-567 | TRIANGLE TEL. COOP. ASSN., INC. | DENTON | – | – | yes |
| 406-568 | MID-RIVERS TEL. COOP., INC. | RYEGATE | – | yes | yes |
| 406-569 | RESERVATION TEL. COOP. | WSQUAW GAP | – | – | yes |
| 406-570 | Verizon | BOZEMAN | – | – | yes |
| 406-571 | Charter | FINLEY PT | – | yes | yes |
| 406-572 | TRIANGLE TEL. COOP. ASSN., INC. | MARTINSDL | – | – | yes |
| 406-573 | SIYEH COMMUNICATIONS | BROWNING | – | yes | yes |
| 406-574 | Lumen | SILVERTIP | – | yes | yes |
| 406-575 | MID-RIVERS TEL. COOP., INC. | NO RYEGATE | – | – | yes |
| 406-576 | AT&T | CONRAD | – | yes | yes |
| 406-577 | Onvoy | BOZEMAN | – | yes | yes |
| 406-578 | Lumen | WILSALL | – | yes | yes |
| 406-579 | Verizon | BOZEMAN | – | – | yes |
| 406-580 | AT&T | BOZEMAN | – | – | yes |
| 406-581 | Verizon | BOZEMAN | – | – | yes |
| 406-582 | Lumen | BOZEMAN | – | – | yes |
| 406-583 | MID-RIVERS TEL. COOP., INC. | BLOOMFIELD | – | – | yes |
| 406-584 | MID-RIVERS TEL. COOP., INC. | LINDSAY | – | yes | yes |
| 406-585 | Lumen | BOZEMAN | – | – | yes |
| 406-586 | Lumen | BOZEMAN | – | – | yes |
| 406-587 | Lumen | BOZEMAN | – | – | yes |
| 406-588 | MID-RIVERS TEL. COOP., INC. | CARLYLE | – | – | yes |
| 406-589 | T-Mobile | BOZEMAN | – | yes | yes |
| 406-590 | Verizon | GREATFALLS | – | – | yes |
| 406-591 | Verizon | BILLINGS | – | – | yes |
| 406-592 | RANGE TEL COOP INC | BUSBY | – | yes | yes |
| 406-593 | AT&T | BUTTE | – | yes | yes |
| 406-594 | Verizon | HELENA | – | – | yes |
| 406-595 | Verizon | BOZEMAN | – | – | yes |
| 406-596 | AT&T | DILLON | – | yes | yes |
| 406-597 | AT&T | SHELBY | – | yes | yes |
| 406-598 | Verizon | BILLINGS | – | – | yes |
| 406-599 | Verizon | BOZEMAN | 2004-10-26 | – | yes |
| 406-600 | Verizon | BOZEMAN | 2006-04-13 | – | yes |
| 406-601 | BLACKFOOT COMMUNICATIONS, INC. - MT | BILLINGS | 2013-11-08 | yes | yes |
| 406-602 | BLACKFOOT COMMUNICATIONS, INC. - MT | BOZEMAN | 2013-11-08 | yes | yes |
| 406-603 | BLACKFOOT COMMUNICATIONS, INC. - MT | HELENA | 2013-11-08 | yes | yes |
| 406-604 | BLACKFOOT COMMUNICATIONS, INC. - MT | GREATFALLS | 2011-07-15 | yes | yes |
| 406-605 | Telnyx | BUTTE | 2021-04-18 | yes | yes |
| 406-606 | TRI TEL, INC. - MT | BILLINGS | 2012-12-07 | yes | yes |
| 406-607 | BLACKFOOT COMMUNICATIONS, INC. - MT | KALISPELL | 2013-11-08 | yes | yes |
| 406-608 | IP HORIZON LLC | BILLINGS | 2021-05-06 | yes | yes |
| 406-609 | AT&T | KALISPELL | 2021-03-24 | yes | yes |
| 406-610 | AT&T | MISSOULA | 2025-01-06 | yes | yes |
| 406-612 | Onvoy | SWAN LAKE | 2007-10-11 | yes | yes |
| 406-613 | Lumen | BOZEMAN | 2022-06-16 | yes | yes |
| 406-614 | Onvoy | BIGFORK | 2020-10-13 | yes | yes |
| 406-615 | WESTERN MONTANA COMMUNITYTEL INC. - MT | THOMPSNFLS | 2014-04-28 | yes | yes |
| 406-616 | Onvoy | THREEFORKS | 2011-07-01 | yes | yes |
| 406-617 | AT&T | BILLINGS | 2024-12-23 | yes | yes |
| 406-618 | TDS | MISSOULA | 2025-10-09 | yes | yes |
| 406-620 | SAGEBRUSH CELLULAR, INC. | BILLINGS | 2005-12-06 | – | yes |
| 406-621 | Verizon | FORTBENTON | – | yes | yes |
| 406-622 | TRIANGLE TEL. COOP. ASSN., INC. | FORTBENTON | – | yes | yes |
| 406-623 | COMMIO, LLC | HARDIN | – | yes | yes |
| 406-624 | MONTANA OPTICOM, LLC - MT | BOZEMAN | 2005-02-03 | yes | yes |
| 406-625 | AT&T | STEVENSVL | – | yes | yes |
| 406-626 | Lumen | FRENCHTOWN | – | yes | yes |
| 406-627 | 3 RIVERS TEL. COOP., INC. | EASTCONRAD | – | – | yes |
| 406-628 | Lumen | LAUREL | – | yes | yes |
| 406-629 | Onvoy | HARDIN | – | yes | yes |
| 406-630 | Lumen | SIDNEY | 2005-02-16 | yes | yes |
| 406-631 | Onvoy | ELMO | 2007-07-26 | yes | yes |
| 406-632 | TRIANGLE TEL. COOP. ASSN., INC. | HARLOWTON | – | yes | yes |
| 406-633 | Lumen | LAUREL | – | yes | yes |
| 406-634 | Onvoy | HELENA | – | yes | yes |
| 406-635 | MID-RIVERS TEL. COOP., INC. | TERRY | – | yes | yes |
| 406-636 | MID-RIVERS TEL. COOP., INC. | LAVINA | – | – | yes |
| 406-637 | Lumen | TERRY | – | yes | yes |
| 406-638 | PROJECT TEL. CO., INC. | HARDIN | – | yes | yes |
| 406-639 | PROJECT TEL. CO., INC. | LODGEGRASS | – | – | yes |
| 406-640 | Verizon | WYELLOWSTN | – | yes | yes |
| 406-641 | Verizon | WYELLOWSTN | – | yes | yes |
| 406-642 | Lumen | VICTOR | – | yes | yes |
| 406-643 | Onvoy | NO PARKMAN | 2007-05-24 | yes | yes |
| 406-644 | BLACKFOOT TEL. COOP., INC. | CHARLO | – | yes | yes |
| 406-645 | Onvoy | DEER LODGE | – | yes | yes |
| 406-646 | Lumen | WYELLOWSTN | – | yes | yes |
| 406-647 | Bandwidth | BILLINGS | 2008-07-03 | yes | yes |
| 406-648 | NEMONT TEL COOP INC | NOHINSDALE | – | yes | yes |
| 406-649 | BLACKFOOT TEL. COOP., INC. | ST REGIS | – | yes | yes |
| 406-650 | SAGEBRUSH CELLULAR, INC. | WOLF POINT | – | – | yes |
| 406-651 | Lumen | BILLINGS | – | yes | yes |
| 406-652 | Lumen | BILLINGS | – | – | yes |
| 406-653 | NEMONT TEL COOP INC | WOLF POINT | – | yes | yes |
| 406-654 | TRIANGLE TEL. COOP. ASSN., INC. | MALTA | – | yes | yes |
| 406-655 | Lumen | BILLINGS | – | – | yes |
| 406-656 | Lumen | BILLINGS | – | – | yes |
| 406-657 | Lumen | BILLINGS | – | – | yes |
| 406-658 | TRIANGLE TEL. COOP. ASSN., INC. | SOUTHMALTA | – | – | yes |
| 406-659 | Lumen | NO PARKMAN | – | yes | yes |
| 406-660 | AT&T | DILLON | – | yes | yes |
| 406-661 | Verizon | BILLINGS | – | yes | yes |
| 406-662 | Lumen | BRIDGER | – | yes | yes |
| 406-663 | TRIANGLE TEL. COOP. ASSN., INC. | RAPELJE | – | – | yes |
| 406-664 | PROJECT TEL. CO., INC. | BELFRY | – | – | yes |
| 406-665 | Lumen | HARDIN | – | yes | yes |
| 406-666 | PROJECT TEL. CO., INC. | FORT SMITH | – | – | yes |
| 406-667 | TRIANGLE TEL. COOP. ASSN., INC. | BROADVIEW | – | – | yes |
| 406-668 | Lumen | FROMBERG | – | yes | yes |
| 406-669 | TRIANGLE TEL. COOP. ASSN., INC. | MOLT | – | – | yes |
| 406-670 | Verizon | BILLINGS | – | – | yes |
| 406-671 | Verizon | BILLINGS | – | – | yes |
| 406-672 | Verizon | BILLINGS | – | – | yes |
| 406-673 | TRIANGLE TEL. COOP. ASSN., INC. | HAYS | – | yes | yes |
| 406-674 | TRIANGLE TEL. COOP. ASSN., INC. | WHITEWATER | – | yes | yes |
| 406-675 | RONAN TEL. CO. | PABLO | – | – | yes |
| 406-676 | RONAN TEL. CO. | RONAN | – | – | yes |
| 406-677 | BLACKFOOT TEL. COOP., INC. | SEELEYLAKE | – | yes | yes |
| 406-678 | BLACKFOOT TEL. COOP., INC. | HAUGAN | – | – | yes |
| 406-679 | NUSO, LLC | HARDIN | – | yes | yes |
| 406-680 | SAGEBRUSH CELLULAR, INC. | MALTA | 2005-01-10 | yes | yes |
| 406-681 | SOUTHERN MONTANA TEL. CO. | GRANT | – | – | yes |
| 406-682 | 3 RIVERS TEL. COOP., INC. | ENNIS | – | yes | yes |
| 406-683 | Lumen | DILLON | – | – | yes |
| 406-684 | 3 RIVERS TEL. COOP., INC. | TWINBRIDGS | – | – | yes |
| 406-685 | 3 RIVERS TEL. COOP., INC. | HARRISON | – | – | yes |
| 406-686 | Lumen | CLYDE PARK | – | yes | yes |
| 406-687 | MID-RIVERS TEL. COOP., INC. | W GLENDIVE | – | yes | yes |
| 406-688 | SAGEBRUSH CELLULAR, INC. | SCOBEY | 2014-02-10 | yes | yes |
| 406-689 | SOUTHERN MONTANA TEL. CO. | WISDOM | – | – | yes |
| 406-690 | Verizon | BILLINGS | – | – | yes |
| 406-691 | AT&T | ANACONDA | – | yes | yes |
| 406-692 | Onvoy | YELLOW BAY | 2007-10-11 | yes | yes |
| 406-693 | Lumen | WARM SPG | – | yes | yes |
| 406-694 | Verizon | BILLINGS | 2005-01-05 | yes | yes |
| 406-695 | NEMONT TEL COOP INC | FRAZER | – | yes | yes |
| 406-696 | Verizon | BILLINGS | 2006-06-15 | – | yes |
| 406-697 | Verizon | BILLINGS | 2005-04-21 | – | yes |
| 406-698 | Verizon | BILLINGS | – | – | yes |
| 406-699 | AT&T | HARDIN | – | yes | yes |
| 406-702 | Charter | BILLINGS | 2012-03-07 | yes | yes |
| 406-703 | Telnyx | COLUMBUS | 2021-05-24 | yes | yes |
| 406-707 | TERRA NOVA TELECOM INC. | LEWISTOWN | – | yes | yes |
| 406-708 | WIDE VOICE, LLC - MT | LEWISTOWN | 2005-02-16 | yes | yes |
| 406-709 | Charter | LAKESIDE | – | yes | yes |
| 406-717 | Vonage | BILLINGS | 2018-06-06 | yes | yes |
| 406-718 | Twilio | DARBY | – | yes | yes |
| 406-719 | Twilio | FROMBERG | – | yes | yes |
| 406-720 | Verizon | COLSTRIP | – | yes | yes |
| 406-721 | Lumen | MISSOULA | – | – | yes |
| 406-722 | BLACKFOOT TEL. COOP., INC. | ALBERTON | – | yes | yes |
| 406-723 | Lumen | BUTTE | – | – | yes |
| 406-724 | NEMONT TEL COOP INC | GLENTANA | – | yes | yes |
| 406-725 | NEMONT TEL COOP INC | LARSLAN | – | – | yes |
| 406-726 | BLACKFOOT TEL. COOP., INC. | ARLEE | – | yes | yes |
| 406-727 | Lumen | GREATFALLS | – | – | yes |
| 406-728 | Lumen | MISSOULA | – | – | yes |
| 406-729 | Lumen | WILSALL | 2016-09-08 | yes | yes |
| 406-730 | Charter | WHITEFISH | – | yes | yes |
| 406-731 | WAVENATION, LLC | GREATFALLS | – | yes | yes |
| 406-732 | Lumen | ST MARY | – | yes | yes |
| 406-733 | 3 RIVERS TEL. COOP., INC. | HIGHWOOD | – | – | yes |
| 406-734 | 3 RIVERS TEL. COOP., INC. | CARTER | – | – | yes |
| 406-735 | 3 RIVERS TEL. COOP., INC. | GEYSER | – | – | yes |
| 406-736 | 3 RIVERS TEL. COOP., INC. | STOCKETT | – | yes | yes |
| 406-737 | TRIANGLE TEL. COOP. ASSN., INC. | GERALDINE | – | – | yes |
| 406-738 | 3 RIVERS TEL. COOP., INC. | RAYNESFORD | – | – | yes |
| 406-739 | TRIANGLE TEL. COOP. ASSN., INC. | LOMA | – | – | yes |
| 406-740 | Verizon | COLSTRIP | – | yes | yes |
| 406-741 | HOT SPRINGS TEL. CO. | HOTSPRINGS | – | – | yes |
| 406-742 | MID-RIVERS TELEPHONE COOPERATIVE, INC. | FAIRVIEW | – | yes | yes |
| 406-743 | AT&T | LAUREL | 2006-09-08 | yes | yes |
| 406-744 | WESTERN MONTANA COMMUNITYTEL INC. - MT | STIGNATIUS | 2012-11-16 | yes | yes |
| 406-745 | BLACKFOOT TEL. COOP., INC. | STIGNATIUS | – | yes | yes |
| 406-746 | NEMONT TEL COOP INC | NASHUA | – | – | yes |
| 406-747 | Lumen | FAIRVIEW | – | yes | yes |
| 406-748 | Lumen | COLSTRIP | – | yes | yes |
| 406-749 | AT&T | COLSTRIP | – | yes | yes |
| 406-750 | Verizon | GREATFALLS | 2005-08-22 | – | yes |
| 406-751 | Lumen | KALISPELL | – | – | yes |
| 406-752 | Lumen | KALISPELL | – | – | yes |
| 406-753 | 3 RIVERS TEL. COOP., INC. | BRADY | – | – | yes |
| 406-754 | BLACKFOOT TEL. COOP., INC. | CONDON | – | – | yes |
| 406-755 | Lumen | KALISPELL | – | – | yes |
| 406-756 | Lumen | KALISPELL | – | – | yes |
| 406-757 | RANGE TEL COOP INC | DECKER | – | yes | yes |
| 406-758 | Lumen | KALISPELL | – | – | yes |
| 406-759 | TRIANGLE TEL. COOP. ASSN., INC. | CHESTER | – | yes | yes |
| 406-760 | Vonage | GREATFALLS | – | yes | yes |
| 406-761 | Lumen | GREATFALLS | – | – | yes |
| 406-762 | NEMONT TEL COOP INC | OPHEIM | – | yes | yes |
| 406-763 | Lumen | GALATNGTWY | – | yes | yes |
| 406-764 | TRI-COUNTY TEL. ASSN., INC. | NO FRANNIE | – | yes | yes |
| 406-765 | NEMONT TEL COOP INC | PLENTYWOOD | – | yes | yes |
| 406-766 | NEMONT TEL COOP INC | FROID | – | – | yes |
| 406-767 | RT COMMUNICATIONS | RIDGE | – | – | yes |
| 406-768 | NEMONT TEL COOP INC | POPLAR | – | yes | yes |
| 406-769 | NEMONT TEL COOP INC | BAINVILLE | – | yes | yes |
| 406-770 | Comcast | GREATFALLS | – | yes | yes |
| 406-771 | Lumen | GREATFALLS | – | – | yes |
| 406-772 | MID-RIVERS TEL. COOP., INC. | PLEVNA | – | yes | yes |
| 406-773 | MID-RIVERS TEL. COOP., INC. | RICHEY | – | yes | yes |
| 406-774 | MID-RIVERS TEL. COOP., INC. | LAMBERT | – | yes | yes |
| 406-775 | MID-RIVERS TEL. COOP., INC. | EKALAKA | – | yes | yes |
| 406-776 | MID-RIVERS TEL. COOP., INC. | SAVAGE | – | – | yes |
| 406-777 | Lumen | STEVENSVL | – | yes | yes |
| 406-778 | MID-RIVERS TEL. COOP., INC. | BAKER | – | yes | yes |
| 406-779 | NEMONT TEL COOP INC | FLAXVLRURL | – | yes | yes |
| 406-780 | Verizon | COLUMBUS | – | yes | yes |
| 406-781 | Verizon | GREATFALLS | – | – | yes |
| 406-782 | Lumen | BUTTE | – | – | yes |
| 406-783 | NEMONT TEL COOP INC | SCOBEYRURL | – | yes | yes |
| 406-784 | RANGE TEL COOP INC | ASHLAND | – | yes | yes |
| 406-785 | NEMONT TEL COOP INC | NO NASHUA | – | yes | yes |
| 406-786 | NEMONT TEL COOP INC | BROCKTON | – | yes | yes |
| 406-787 | NEMONT TEL COOP INC | CULBERTSON | – | yes | yes |
| 406-788 | Verizon | GREATFALLS | – | – | yes |
| 406-789 | NEMONT TEL COOP INC | MEDICINELK | – | yes | yes |
| 406-790 | AT&T | CULBERTSON | – | yes | yes |
| 406-791 | Lumen | GREATFALLS | – | – | yes |
| 406-792 | Onvoy | BUTTE | – | yes | yes |
| 406-793 | BLACKFOOT TEL. COOP., INC. | OVANDO | – | – | yes |
| 406-794 | Onvoy | BILLINGS | 2006-03-15 | yes | yes |
| 406-795 | Lumen | WIBAUX | – | yes | yes |
| 406-796 | MID-RIVERS TELEPHONE COOPERATIVE, INC. | WIBAUX | – | yes | yes |
| 406-797 | Lumen | ANACONDA | – | yes | yes |
| 406-798 | MID-RIVERS TEL. COOP., INC. | WESTSIDNEY | – | – | yes |
| 406-799 | AT&T | GREATFALLS | – | yes | yes |
| 406-800 | Onvoy | BRIDGER | 2013-12-11 | yes | yes |
| 406-802 | Verizon | HAMILTON | – | yes | yes |
| 406-804 | Onvoy | GARDINER | 2019-08-20 | yes | yes |
| 406-807 | Onvoy | EGLACIERPK | 2021-04-22 | yes | yes |
| 406-808 | Lumen | HAVRE | – | yes | yes |
| 406-812 | Onvoy | LAUREL | 2011-10-03 | yes | yes |
| 406-813 | Verizon | BELGRADE | 2011-09-14 | yes | yes |
| 406-815 | AT&T | RED LODGE | – | yes | yes |
| 406-818 | AT&T | RED LODGE | – | yes | yes |
| 406-820 | Onvoy | OLNEY | 2007-10-11 | yes | yes |
| 406-821 | Lumen | DARBY | – | yes | yes |
| 406-822 | BLACKFOOT TEL. COOP., INC. | SUPERIOR | – | yes | yes |
| 406-823 | Lumen | LIVINGSTON | – | yes | yes |
| 406-824 | AT&T | STIGNATIUS | – | yes | yes |
| 406-825 | BLACKFOOT TEL. COOP., INC. | CLINTON | – | yes | yes |
| 406-826 | BLACKFOOT TEL. COOP., INC. | PLAINS | – | yes | yes |
| 406-827 | BLACKFOOT TEL. COOP., INC. | THOMPSNFLS | – | yes | yes |
| 406-828 | RANGE TEL COOP INC | ALZADA | – | yes | yes |
| 406-829 | Lumen | MISSOULA | – | – | yes |
| 406-830 | Charter | MISSOULA | 2007-02-06 | yes | yes |
| 406-831 | Telnyx | BILLINGS | 2016-12-21 | yes | yes |
| 406-832 | SOUTHERN MONTANA TEL. CO. | WISE RIVER | – | – | yes |
| 406-833 | Verizon | RONAN | – | yes | yes |
| 406-834 | SOUTHERN MONTANA TEL. CO. | JACKSON | – | – | yes |
| 406-835 | 3 RIVERS TEL. COOP., INC. | MELROSE | – | – | yes |
| 406-836 | Onvoy | GREATFALLS | – | yes | yes |
| 406-837 | Lumen | BIGFORK | – | yes | yes |
| 406-838 | Lumen | COOKE CITY | – | yes | yes |
| 406-839 | Charter | BILLINGS | 2006-09-30 | yes | yes |
| 406-840 | Onvoy | SILVERTIP | 2007-05-23 | yes | yes |
| 406-841 | Lumen | HELENA | – | yes | yes |
| 406-842 | 3 RIVERS TEL. COOP., INC. | SHERIDAN | – | yes | yes |
| 406-843 | 3 RIVERS TEL. COOP., INC. | VIRGINIACY | – | – | yes |
| 406-844 | Lumen | LAKESIDE | – | yes | yes |
| 406-845 | Charter | CUT BANK | 2008-10-27 | yes | yes |
| 406-846 | Lumen | DEER LODGE | – | yes | yes |
| 406-847 | BLACKFOOT TEL. COOP., INC. | NOXON | – | – | yes |
| 406-848 | Lumen | GARDINER | – | yes | yes |
| 406-849 | Lumen | ELMO | – | yes | yes |
| 406-850 | AT&T | BILLINGS | – | yes | yes |
| 406-851 | AT&T | MILES CITY | – | yes | yes |
| 406-852 | Verizon | MILES CITY | – | yes | yes |
| 406-853 | Verizon | MILES CITY | – | yes | yes |
| 406-854 | Lumen | MARION | – | yes | yes |
| 406-855 | AT&T | BILLINGS | – | – | yes |
| 406-856 | MID-RIVERS TEL. COOP., INC. | CUSTER | – | – | yes |
| 406-857 | Lumen | SOMERS | – | yes | yes |
| 406-858 | Dish | KALISPELL | – | yes | yes |
| 406-859 | BLACKFOOT TEL. COOP., INC. | PHILIPSBG | – | – | yes |
| 406-860 | AT&T | BILLINGS | – | – | yes |
| 406-861 | AT&T | BILLINGS | – | yes | yes |
| 406-862 | Lumen | WHITEFISH | – | – | yes |
| 406-863 | Lumen | WHITEFISH | – | yes | yes |
| 406-864 | BLACKFOOT TEL. COOP., INC. | S ALBERTON | – | – | yes |
| 406-865 | Verizon | DILLON | – | yes | yes |
| 406-866 | Lumen | GREATFALLS | – | yes | yes |
| 406-867 | WAVENATION, LLC | BILLINGS | – | yes | yes |
| 406-868 | Verizon | GREATFALLS | – | – | yes |
| 406-869 | Allstream | BILLINGS | – | – | yes |
| 406-870 | Bandwidth | GREATFALLS | – | yes | yes |
| 406-871 | Verizon | KALISPELL | 2006-06-15 | – | yes |
| 406-872 | WESTERN MONTANA COMMUNITYTEL INC. - MT | POLSON | 2007-10-15 | yes | yes |
| 406-873 | Lumen | CUT BANK | – | yes | yes |
| 406-874 | MID-RIVERS TELEPHONE COOPERATIVE, INC. | MILES CITY | – | yes | yes |
| 406-875 | PROJECT TEL. CO., INC. | POMPESPLLR | – | – | yes |
| 406-876 | Verizon | BILLINGS | – | yes | yes |
| 406-877 | RESERVATION TEL. COOP. | WEST BEACH | – | – | yes |
| 406-878 | NUSO, LLC | GREATFALLS | 2013-03-01 | yes | yes |
| 406-879 | AT&T | HAVRE | 2009-11-11 | yes | yes |
| 406-880 | Verizon | MISSOULA | – | – | yes |
| 406-881 | Lumen | OLNEY | – | yes | yes |
| 406-882 | INTERBEL TEL. COOP., INC. | EUREKARURL | – | – | yes |
| 406-883 | Lumen | POLSON | – | – | yes |
| 406-884 | Lumen | POLSON | – | yes | yes |
| 406-885 | Verizon | KALISPELL | – | – | yes |
| 406-886 | Lumen | SWAN LAKE | – | yes | yes |
| 406-887 | Lumen | FINLEY PT | – | yes | yes |
| 406-888 | Lumen | W GLACIER | – | yes | yes |
| 406-889 | INTERBEL TEL. COOP., INC. | EUREKARURL | – | – | yes |
| 406-890 | Charter | KALISPELL | – | yes | yes |
| 406-891 | AT&T | BAKER | – | yes | yes |
| 406-892 | Lumen | COLUMBIFLS | – | – | yes |
| 406-893 | NEMONT TEL COOP INC | PEERLESS | – | yes | yes |
| 406-894 | COMMIO, LLC | BILLINGS | – | yes | yes |
| 406-895 | NEMONT TEL COOP INC | OUTLOOK | – | yes | yes |
| 406-896 | Lumen | BILLINGS | – | – | yes |
| 406-897 | Charter | COLUMBIFLS | – | yes | yes |
| 406-898 | Charter | BOZEMAN | 2009-03-20 | yes | yes |
| 406-899 | AT&T | GREATFALLS | – | – | yes |
| 406-900 | Lumen | ENNIS | 2017-09-29 | yes | yes |
| 406-901 | Charter | BILLINGS | 2021-04-14 | yes | yes |
| 406-902 | Lumen | SHERIDAN | 2018-11-27 | yes | yes |
| 406-905 | Onvoy | JOLIET | 2011-10-03 | yes | yes |
| 406-909 | Verizon | COLUMBIFLS | 2018-05-24 | yes | yes |
| 406-913 | Verizon | ROUNDUP | – | yes | yes |
| 406-914 | Verizon | LAMBERT | – | yes | yes |
| 406-915 | Verizon | SO WOLF PT | – | yes | yes |
| 406-916 | T-Mobile | HELENA | 2017-03-24 | yes | yes |
| 406-918 | AT&T | LIBBY | 2026-01-15 | yes | yes |
| 406-919 | TERRA NOVA TELECOM INC. | BELGRADE | 2019-03-04 | yes | yes |
| 406-920 | Verizon | BOZEMAN | – | yes | yes |
| 406-922 | Allstream | BOZEMAN | – | yes | yes |
| 406-923 | COMMIO, LLC | GREATFALLS | – | yes | yes |
| 406-924 | Lumen | BELGRADE | 2004-10-26 | yes | yes |
| 406-925 | Verizon | DILLON | – | yes | yes |
| 406-926 | Charter | MISSOULA | 2011-01-07 | yes | yes |
| 406-927 | AT&T | BILLINGS | 2010-07-23 | yes | yes |
| 406-928 | Verizon | GRASSRANGE | – | yes | yes |
| 406-929 | Onvoy | HUNGRYHORS | 2007-07-26 | yes | yes |
| 406-930 | Verizon | BIG TIMBER | – | yes | yes |
| 406-931 | Verizon | BIG TIMBER | – | yes | yes |
| 406-932 | TRIANGLE TEL. COOP. ASSN., INC. | BIG TIMBER | – | yes | yes |
| 406-933 | Lumen | HELENA | – | yes | yes |
| 406-934 | WIDE VOICE, LLC - MT | MILES CITY | – | yes | yes |
| 406-935 | Verizon | BROADUS | – | yes | yes |
| 406-936 | Bandwidth | CLYDE PARK | 2015-07-15 | yes | yes |
| 406-937 | NORTHERN TEL. COOP., INC. | SUNBURST | – | – | yes |
| 406-938 | Verizon | ALZADA | – | yes | yes |
| 406-939 | Verizon | W GLENDIVE | – | yes | yes |
| 406-940 | AT&T | MOLT | 2017-07-18 | yes | yes |
| 406-941 | Verizon | W GLENDIVE | – | yes | yes |
| 406-942 | Verizon | GLASGOW | 2009-10-23 | yes | yes |
| 406-943 | Lumen | SIDNEY | 2003-01-09 | yes | yes |
| 406-944 | Lumen | MILES CITY | 2003-01-09 | yes | yes |
| 406-945 | AT&T | HAVRE | – | yes | yes |
| 406-946 | Lumen | LIVINGSTON | 2003-01-09 | yes | yes |
| 406-947 | MID-RIVERS TEL. COOP., INC. | MUSSELSHLL | – | – | yes |
| 406-948 | Lumen | GLENDIVE | 2003-01-09 | yes | yes |
| 406-949 | AT&T | TOWNSEND | – | yes | yes |
| 406-951 | AT&T | MILES CITY | – | yes | yes |
| 406-952 | Charter | GREATFALLS | – | yes | yes |
| 406-953 | SAGEBRUSH CELLULAR, INC. | HARDIN | – | yes | yes |
| 406-954 | Verizon | ROY | – | yes | yes |
| 406-955 | Verizon | KALISPELL | 2023-12-04 | yes | yes |
| 406-956 | AT&T | BAKER | 2010-10-20 | yes | yes |
| 406-957 | Verizon | TERRY | – | yes | yes |
| 406-960 | Lumen | DILLON | 2003-01-09 | yes | yes |
| 406-961 | Lumen | HAMILTON | – | yes | yes |
| 406-962 | Lumen | JOLIET | – | yes | yes |
| 406-963 | NEMONT TEL COOP INC | FROIDRURAL | – | yes | yes |
| 406-964 | Lumen | GREATFALLS | – | yes | yes |
| 406-965 | AIRUS, INC. - MT | GREATFALLS | – | yes | yes |
| 406-966 | Lumen | SHELBY | 2003-01-09 | yes | yes |
| 406-967 | PROJECT TEL. CO., INC. | WORDEN | – | yes | yes |
| 406-968 | HD CARRIER LLC | LEWISTOWN | 2003-01-09 | yes | yes |
| 406-969 | SKYE TELECOM LLC DBA SKYETEL | BILLINGS | – | yes | yes |
| 406-970 | Lumen | BILLINGS | 2016-06-03 | yes | yes |
| 406-971 | Verizon | PLEVNA | – | yes | yes |
| 406-972 | WEST RIVER COOPERATIVE TELEPHONE COMPANY | WCAMPCROOK | – | – | yes |
| 406-973 | Verizon | SIDNEY | – | yes | yes |
| 406-974 | Verizon | CIRCLE | – | yes | yes |
| 406-975 | Verizon | EKALAKA | – | yes | yes |
| 406-977 | Verizon | JORDAN | – | yes | yes |
| 406-978 | Verizon | BAKER | – | yes | yes |
| 406-979 | Verizon | RICHEY | – | yes | yes |
| 406-980 | Verizon | TOWNSEND | – | yes | yes |
| 406-981 | Verizon | SOMILES CY | – | yes | yes |
| 406-982 | Lumen | YELLOW BAY | – | yes | yes |
| 406-983 | Verizon | ASHLAND | – | yes | yes |
| 406-984 | RANGE TEL COOP INC | BIRNEY | – | yes | yes |
| 406-987 | Verizon | GLENDIVE | – | yes | yes |
| 406-988 | Lumen | DILLON | 2005-01-07 | yes | yes |
| 406-989 | AT&T | W GLENDIVE | – | yes | yes |
| 406-990 | AT&T | LAME DEER | 2020-05-12 | yes | yes |
| 406-991 | Onvoy | MARION | 2007-10-11 | yes | yes |
| 406-992 | Onvoy | HELENA | 2008-08-26 | yes | yes |
| 406-993 | 3 RIVERS TEL. COOP., INC. | BIG SKY | – | yes | yes |
| 406-994 | Lumen | BOZEMAN | – | – | yes |
| 406-995 | 3 RIVERS TEL. COOP., INC. | BIG SKY | – | yes | yes |
| 406-996 | Charter | HELENA | 2011-01-10 | yes | yes |
| 406-997 | AT&T | FROMBERG | 2024-01-24 | yes | yes |
| 406-998 | AIRUS, INC. - MT | BILLINGS | 2015-08-26 | yes | yes |
| 406-999 | MONTANA OPTICOM, LLC - MT | BIG SKY | 2006-07-11 | – | yes |
Frequently asked
How many prefixes does area code 406 have?
754 NXX blocks are assigned of 786 possible. Each block is 10,000 consecutive numbers, so the code currently covers about 7,540 thousand-number ranges across 260 rate centers.
What do the first three digits after 406 tell me?
They identify the block, which tells you the rate center it was allocated to and the carrier that received it. They do not tell you who serves the number today: portability moves numbers between carriers, and pooling splits a block between several of them.
Is a 406 prefix tied to a specific town?
To a rate center, which is billing geography rather than a town. NANPA abbreviates rate center names to ten characters and in large metros uses zone codes, so the name is a NANPA label, not a place name.
What does “pooled” mean in the 406 table?
That the block is in thousands-block pooling: carriers draw 1,000-number lots from it instead of taking all 10,000. 527 of 406's blocks are pooled, which is how regulators slowed down area code exhaustion – and why one prefix can belong to several carriers.
Source and limits
NANPA CO Code Assignment Records, all states, utilized codes, file updated 11/01/2026 – the rows where the record's Use field is “AS” (assigned). Unavailable codes are excluded. The records say who received a block and when, not who serves a particular number today.
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