Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records
Area code 667 prefixes
454 of the 786 possible NXX blocks are assigned in area code 667 (57.8% of capacity), spread across 102 rate centers and 48 holders. The largest holders are ONVOY, LLC - MD (85 blocks, 18.7%), NEW CINGULAR WIRELESS PCS, LLC - DC (60 blocks, 13.2%), OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (55 blocks, 12.1%). Grouped by brand, Onvoy accounts for 85 blocks; brand-attributable holders cover 73% 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 2012-02-08 to 2026-10-29, with 99 blocks handed out in 2021 alone. 454 blocks (100%) 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. 11 assigned blocks (514, 536, 551, 553, 554, 556…) are not yet in service: assigned to a carrier but not open for calls, so a caller ID from one is spoofed. 274 were growth assignments – additional blocks to a carrier that had already filled its earlier ones.
454 assigned blocks of 786
102 rate centers
48 holders of record
100% in thousands-block pooling
Largest holders in 667
| Holder of record, as NANPA names it | Brand | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC - MD | Onvoy | 85 | 18.7% |
| NEW CINGULAR WIRELESS PCS, LLC - DC | AT&T | 60 | 13.2% |
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | T-Mobile | 55 | 12.1% |
| CORE COMMUNICATIONS, INC.- MD | – | 41 | 9% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Verizon | 24 | 5.3% |
| TON80 COMMUNICATIONS, LLC | – | 21 | 4.6% |
| BANDWIDTH.COM CLEC, LLC - MD | Bandwidth | 16 | 3.5% |
| ONVOY SPECTRUM, LLC | Charter | 15 | 3.3% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MD | AT&T | 8 | 1.8% |
| NUSO, LLC | – | 8 | 1.8% |
| COMMIO, LLC | – | 8 | 1.8% |
| BOOST SUBSCRIBERCO L.L.C. | Dish | 8 | 1.8% |
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.
BALTIMORE 77PIKESVILLE 24SALISBURY 23ABERDEEN 23ANNAPOLIS 17COLUMBIA 13CATONSVL 13TOWSON 11BEL AIR 8GLENBURNIE 8ODENTON 8ELKTON 7PRINCEFRCK 6ESSEX 6PARKVILLE 6ARGRGBSNIS 5WESTMINSTR 5CAMBRIDGE 5SEVERN 5SEVERNA PK 5CENTREVL 4OXFORD 4DUNDALK 4ELKRIDGE 4ELLICOTTCY 4CROFTON 4EDGEWOOD 4CHASE 4SOLOMONS 4GREENSBORO 3PERRYVILLE 3WEST RIVER 3PRESTON 3STILL POND 3CHESAPKECY 3REISTERSTN 3DARLINGTON 3CHURCHHILL 3NEWWINDSOR 3CHURCHVL 3EASTON 3STEVENSVL 3HAMPSTEAD 3ARBUTUS 3PT DEPOSIT 3GLENWOOD 3SUDLERSVL 3
All 454 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 |
|---|---|---|---|---|---|
| 667-200 | Onvoy | COLUMBIA | 2015-12-18 | yes | yes |
| 667-201 | Verizon | BEL AIR | 2015-11-17 | yes | yes |
| 667-202 | Onvoy | ELKTON | 2016-02-17 | yes | yes |
| 667-203 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-204 | Windstream | ANNAPOLIS | 2016-12-29 | yes | yes |
| 667-205 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-206 | T-Mobile | TOWSON | 2013-07-16 | yes | yes |
| 667-207 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-208 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-209 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-210 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-212 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-213 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-214 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-215 | Comcast | ELKTON | 2016-09-27 | yes | yes |
| 667-216 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-217 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-218 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-219 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-220 | Onvoy | GREENSBORO | 2017-03-24 | yes | yes |
| 667-221 | Telnyx | SALISBURY | 2017-06-14 | yes | yes |
| 667-222 | Onvoy | ARGRGBSNIS | 2015-08-17 | yes | yes |
| 667-223 | Vonage | BALTIMORE | 2017-08-04 | yes | yes |
| 667-224 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-225 | AT&T | ANNAPOLIS | 2014-07-15 | yes | yes |
| 667-226 | Onvoy | STMICHAELS | 2017-03-27 | yes | yes |
| 667-227 | ATLANTECH ONLINE, INC. - MD | SALISBURY | 2017-09-15 | yes | yes |
| 667-228 | T-Mobile | ABERDEEN | 2015-01-21 | yes | yes |
| 667-229 | T-Mobile | ABERDEEN | 2016-02-18 | yes | yes |
| 667-230 | Peerless | CENTREVL | 2018-02-13 | yes | yes |
| 667-231 | T-Mobile | ABERDEEN | – | yes | yes |
| 667-232 | AT&T | GLENBURNIE | 2018-04-04 | yes | yes |
| 667-233 | Verizon | BALTIMORE | 2015-02-13 | yes | yes |
| 667-234 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-235 | Vonage | SALISBURY | 2018-06-01 | yes | yes |
| 667-236 | CORE COMMUNICATIONS, INC.- MD | PERRYVILLE | 2018-06-11 | yes | yes |
| 667-237 | CORE COMMUNICATIONS, INC.- MD | WEST RIVER | 2018-06-11 | yes | yes |
| 667-238 | CORE COMMUNICATIONS, INC.- MD | PRESTON | 2018-06-12 | yes | yes |
| 667-239 | Verizon | BALTIMORE | 2012-02-08 | yes | yes |
| 667-240 | BARR TELL USA, INC. | COLUMBIA | 2016-11-22 | yes | yes |
| 667-241 | CORE COMMUNICATIONS, INC.- MD | RIDGELY | 2018-06-12 | yes | yes |
| 667-242 | CORE COMMUNICATIONS, INC.- MD | ROCK HALL | 2018-06-12 | yes | yes |
| 667-243 | CORE COMMUNICATIONS, INC.- MD | OXFORD | 2018-06-04 | yes | yes |
| 667-244 | CORE COMMUNICATIONS, INC.- MD | STILL POND | 2018-06-12 | yes | yes |
| 667-245 | CORE COMMUNICATIONS, INC.- MD | CECILTON | 2018-06-12 | yes | yes |
| 667-246 | CORE COMMUNICATIONS, INC.- MD | CENTREVL | 2018-06-12 | yes | yes |
| 667-247 | CORE COMMUNICATIONS, INC.- MD | CHESAPKECY | 2018-06-12 | yes | yes |
| 667-248 | CORE COMMUNICATIONS, INC.- MD | DENTON | 2018-06-12 | yes | yes |
| 667-249 | CORE COMMUNICATIONS, INC.- MD | GALENA | 2018-06-12 | yes | yes |
| 667-250 | Charter | BALTIMORE | 2018-06-19 | yes | yes |
| 667-251 | Lumen | TOWSON | 2014-12-24 | yes | yes |
| 667-252 | Charter | SALISBURY | 2018-06-19 | yes | yes |
| 667-253 | NUSO, LLC | SALISBURY | 2013-03-11 | yes | yes |
| 667-254 | CORE COMMUNICATIONS, INC.- MD | CHESTERTN | – | yes | yes |
| 667-255 | Onvoy | HILLSBORO | 2018-08-22 | yes | yes |
| 667-256 | EXIANT COMMUNICATIONS LLC | ABERDEEN | 2018-09-27 | yes | yes |
| 667-257 | Vonage | COLUMBIA | 2018-11-14 | yes | yes |
| 667-258 | AIRESPRING, INC. | BALTIMORE | 2018-11-14 | yes | yes |
| 667-259 | Verizon | REISTERSTN | 2018-12-21 | yes | yes |
| 667-260 | Onvoy | BALTIMORE | – | yes | yes |
| 667-261 | AT&T | COLUMBIA | 2019-12-24 | yes | yes |
| 667-262 | Charter | BALTIMORE | – | yes | yes |
| 667-263 | AT&T | DUNDALK | 2020-03-09 | yes | yes |
| 667-264 | Verizon | DELMAR | 2019-02-20 | yes | yes |
| 667-265 | Verizon | VIENNA | 2019-03-22 | yes | yes |
| 667-266 | COMMIO, LLC | SALISBURY | 2017-06-20 | yes | yes |
| 667-267 | CORE COMMUNICATIONS, INC.- MD | ANNAPOLIS | 2018-10-22 | yes | yes |
| 667-268 | Bandwidth | DARLINGTON | 2019-06-19 | yes | yes |
| 667-269 | CORE COMMUNICATIONS, INC.- MD | ELKTON | 2018-10-15 | yes | yes |
| 667-270 | Verizon | ANNAPOLIS | 2019-08-16 | yes | yes |
| 667-271 | EXIANT COMMUNICATIONS LLC | SALISBURY | 2019-09-03 | yes | yes |
| 667-272 | AT&T | WESTMINSTR | 2019-09-18 | yes | yes |
| 667-273 | CSC WIRELESS, LLC | PIKESVILLE | 2019-10-09 | yes | yes |
| 667-274 | AT&T | ELKRIDGE | 2019-10-11 | yes | yes |
| 667-275 | Verizon | TOWSON | 2019-11-01 | yes | yes |
| 667-276 | Verizon | BEL AIR | 2020-01-27 | yes | yes |
| 667-277 | CORE COMMUNICATIONS, INC.- MD | SHERWD FOR | 2018-05-31 | yes | yes |
| 667-278 | AT&T | TOWSON | 2020-03-09 | yes | yes |
| 667-279 | Onvoy | BISHOPVL | 2020-03-12 | yes | yes |
| 667-280 | Vonage | ELLICOTTCY | 2020-05-05 | yes | yes |
| 667-281 | Peerless | SALISBURY | 2016-05-25 | yes | yes |
| 667-282 | Onvoy | TILGHMAN | 2020-05-28 | yes | yes |
| 667-283 | AT&T | FORK | 2020-07-06 | yes | yes |
| 667-284 | Lumen | BALTIMORE | 2020-07-30 | yes | yes |
| 667-285 | Onvoy | HURLOCK | 2017-03-24 | yes | yes |
| 667-286 | HD CARRIER LLC | SALISBURY | 2020-08-12 | yes | yes |
| 667-287 | NUSO, LLC | BISHOPVL | 2020-09-01 | yes | yes |
| 667-288 | Lumen | BERLIN | 2020-09-01 | yes | yes |
| 667-289 | T-Mobile | ABERDEEN | 2020-09-01 | yes | yes |
| 667-290 | IP HORIZON LLC | BALTIMORE | 2020-09-09 | yes | yes |
| 667-291 | Onvoy | MILLINGTON | 2017-03-27 | yes | yes |
| 667-292 | IP HORIZON LLC | SALISBURY | 2020-09-09 | yes | yes |
| 667-293 | Onvoy | SHARPTOWN | 2020-09-21 | yes | yes |
| 667-294 | AT&T | TOWSON | 2020-09-21 | yes | yes |
| 667-295 | CORE COMMUNICATIONS, INC.- MD | CROFTON | 2018-10-15 | yes | yes |
| 667-296 | Verizon | REISTERSTN | 2020-09-22 | yes | yes |
| 667-297 | T-Mobile | EDGEWOOD | 2020-12-09 | yes | yes |
| 667-298 | T-Mobile | ABERDEEN | 2021-01-18 | yes | yes |
| 667-299 | HD CARRIER LLC | ANNAPOLIS | 2020-04-10 | yes | yes |
| 667-300 | CORE COMMUNICATIONS, INC.- MD | COLUMBIA | 2018-06-01 | yes | yes |
| 667-301 | Verizon | PRINCEFRCK | 2021-01-25 | yes | yes |
| 667-302 | Telnyx | CECILTON | 2021-02-09 | yes | yes |
| 667-303 | NUSO, LLC | BALTIMORE | 2013-03-11 | yes | yes |
| 667-304 | Bandwidth | ESSEX | 2021-02-22 | yes | yes |
| 667-305 | NUSO, LLC | PIKESVILLE | 2013-05-10 | yes | yes |
| 667-306 | Lumen | BALTIMORE | 2021-03-19 | yes | yes |
| 667-307 | Peerless | CROFTON | 2013-04-09 | yes | yes |
| 667-308 | Peerless | TOWSON | 2012-11-20 | yes | yes |
| 667-309 | Onvoy | BALTIMORE | – | yes | yes |
| 667-310 | T-Mobile | PARKVILLE | 2021-04-13 | yes | yes |
| 667-312 | ATLANTECH ONLINE, INC. - MD | BALTIMORE | 2015-05-11 | yes | yes |
| 667-313 | Verizon | PIKESVILLE | 2015-12-16 | yes | yes |
| 667-314 | BARR TELL USA, INC. | WESTMINSTR | – | yes | yes |
| 667-315 | Bandwidth | BEL AIR | 2021-04-13 | yes | yes |
| 667-316 | Telnyx | OXFORD | 2021-04-17 | yes | yes |
| 667-317 | Lumen | PRINCEANNE | 2021-04-21 | yes | yes |
| 667-318 | Bandwidth | COCKEYSVL | 2021-05-04 | yes | yes |
| 667-319 | T-Mobile | CHESTERTN | 2021-05-05 | yes | yes |
| 667-320 | T-Mobile | ABERDEEN | 2021-05-05 | yes | yes |
| 667-321 | T-Mobile | PRINCEFRCK | 2016-06-21 | yes | yes |
| 667-322 | Onvoy | WATERLO236 | 2021-05-12 | yes | yes |
| 667-323 | Lumen | QUEENSTOWN | 2021-05-25 | yes | yes |
| 667-324 | T-Mobile | RANDALLSTN | 2021-06-03 | yes | yes |
| 667-325 | T-Mobile | GLENBURNIE | 2021-06-11 | yes | yes |
| 667-326 | CORE COMMUNICATIONS, INC.- MD | CHURCHHILL | 2018-12-10 | yes | yes |
| 667-327 | Onvoy | CAMBRIDGE | 2021-03-18 | yes | yes |
| 667-328 | AT&T | ESSEX | 2021-06-23 | yes | yes |
| 667-329 | Telnyx | PARKTON | 2021-06-23 | yes | yes |
| 667-330 | Windstream | SALISBURY | 2012-05-23 | yes | yes |
| 667-331 | AT&T | TOWSON | 2021-07-08 | yes | yes |
| 667-332 | CORE COMMUNICATIONS, INC.- MD | NEWWINDSOR | 2018-10-15 | yes | yes |
| 667-333 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | ARGRGBSNIS | 2015-05-14 | yes | yes |
| 667-334 | T-Mobile | ABERDEEN | 2021-08-26 | yes | yes |
| 667-335 | T-Mobile | BALTIMORE | 2021-08-26 | yes | yes |
| 667-336 | CORE COMMUNICATIONS, INC.- MD | BEL AIR | 2018-06-01 | yes | yes |
| 667-337 | Onvoy | CENTREVL | 2021-03-18 | yes | yes |
| 667-338 | Onvoy | CROFTON | 2021-09-01 | yes | yes |
| 667-339 | Onvoy | SYKESVILLE | 2021-09-01 | yes | yes |
| 667-340 | Onvoy | CHURCHVL | 2021-09-01 | yes | yes |
| 667-341 | Onvoy | DELMAR | 2021-09-01 | yes | yes |
| 667-342 | Onvoy | PRESTON | 2021-09-01 | yes | yes |
| 667-343 | Verizon | CAMBRIDGE | 2021-07-28 | yes | yes |
| 667-344 | Telnyx | CHASE | – | yes | yes |
| 667-345 | CORE COMMUNICATIONS, INC.- MD | CATONSVL | 2018-06-04 | yes | yes |
| 667-346 | CSC WIRELESS, LLC | SALISBURY | 2019-10-15 | yes | yes |
| 667-347 | Onvoy | FEDERALSBG | 2021-03-18 | yes | yes |
| 667-348 | Onvoy | RIDGELY | 2021-09-01 | yes | yes |
| 667-349 | Onvoy | STILL POND | 2021-09-01 | yes | yes |
| 667-350 | Onvoy | WINGATE | 2021-09-01 | yes | yes |
| 667-351 | T-Mobile | BALTIMORE | 2021-09-27 | yes | yes |
| 667-352 | T-Mobile | ABERDEEN | 2016-11-14 | yes | yes |
| 667-353 | CORETEL MARYLAND, INC. - MD | CARDIFF | 2019-09-12 | yes | yes |
| 667-354 | T-Mobile | BALTIMORE | 2021-10-07 | yes | yes |
| 667-355 | T-Mobile | ABERDEEN | 2021-10-07 | yes | yes |
| 667-356 | Onvoy | SEVERN | 2021-03-25 | yes | yes |
| 667-357 | Onvoy | GREENSBORO | 2021-03-18 | yes | yes |
| 667-358 | T-Mobile | EASTON | 2021-11-01 | yes | yes |
| 667-359 | Bandwidth | COLUMBIA | 2021-10-25 | yes | yes |
| 667-360 | Onvoy | ODENTON | 2021-03-25 | yes | yes |
| 667-361 | Charter | CHURCHHILL | 2021-06-17 | yes | yes |
| 667-362 | CORE COMMUNICATIONS, INC.- MD | ANNAPOLIS | 2018-10-18 | yes | yes |
| 667-363 | Onvoy | SHERWD FOR | 2021-03-25 | yes | yes |
| 667-364 | CORE COMMUNICATIONS, INC.- MD | STEVENSVL | 2018-06-04 | yes | yes |
| 667-365 | TON80 COMMUNICATIONS, LLC | CHESAPKECY | 2021-05-07 | yes | yes |
| 667-366 | CORE COMMUNICATIONS, INC.- MD | HAMPSTEAD | 2018-10-15 | yes | yes |
| 667-367 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | WESTMINSTR | 2015-05-21 | yes | yes |
| 667-368 | T-Mobile | ELKTON | 2021-11-17 | yes | yes |
| 667-369 | T-Mobile | CATONSVL | 2021-11-17 | yes | yes |
| 667-370 | Onvoy | PARKTON | 2021-03-25 | yes | yes |
| 667-371 | T-Mobile | ELLICOTTCY | 2021-11-22 | yes | yes |
| 667-372 | CORE COMMUNICATIONS, INC.- MD | CAMBRIDGE | 2018-10-15 | yes | yes |
| 667-373 | CORE COMMUNICATIONS, INC.- MD | NORTHBEACH | 2018-10-15 | yes | yes |
| 667-374 | Bandwidth | WATERLO238 | 2021-12-03 | yes | yes |
| 667-375 | T-Mobile | CHASE | 2021-12-07 | yes | yes |
| 667-376 | Onvoy | OXFORD | 2021-03-18 | yes | yes |
| 667-377 | Onvoy | ROCK HALL | 2021-03-18 | yes | yes |
| 667-378 | T-Mobile | ESSEX | 2021-12-07 | yes | yes |
| 667-379 | T-Mobile | BALTIMORE | 2021-12-07 | yes | yes |
| 667-380 | Onvoy | ANNAPOLIS | 2021-09-01 | yes | yes |
| 667-381 | T-Mobile | PARKVILLE | 2021-12-07 | yes | yes |
| 667-382 | CORE COMMUNICATIONS, INC.- MD | WINGATE | 2018-10-16 | yes | yes |
| 667-383 | T-Mobile | TOWSON | 2021-12-07 | yes | yes |
| 667-384 | Dish | SALISBURY | 2021-12-10 | yes | yes |
| 667-385 | Dish | SOLOMONS | 2021-12-10 | yes | yes |
| 667-386 | T-Mobile | ARBUTUS | 2021-12-14 | yes | yes |
| 667-387 | Onvoy | PERRYVILLE | 2021-03-25 | yes | yes |
| 667-388 | AT&T | SEVERN | 2021-12-15 | yes | yes |
| 667-389 | COMMIO, LLC | CAMBRIDGE | – | yes | yes |
| 667-390 | T-Mobile | RANDALLSTN | 2022-01-27 | yes | yes |
| 667-391 | T-Mobile | BALTIMORE | 2022-01-27 | yes | yes |
| 667-392 | T-Mobile | ABERDEEN | 2022-01-27 | yes | yes |
| 667-393 | Bandwidth | MILLERSVL | 2022-02-10 | yes | yes |
| 667-394 | Bandwidth | NEWWINDSOR | 2022-02-22 | yes | yes |
| 667-395 | Bandwidth | CARDIFF | 2022-02-22 | yes | yes |
| 667-396 | Onvoy | PT DEPOSIT | 2021-03-25 | yes | yes |
| 667-397 | Onvoy | SOLOMONS | 2021-03-25 | yes | yes |
| 667-398 | Bandwidth | PT DEPOSIT | 2022-02-22 | yes | yes |
| 667-399 | HD CARRIER LLC | UNION BDG | 2020-04-10 | yes | yes |
| 667-400 | BARR TELL USA, INC. | BALTIMORE | 2016-11-10 | yes | yes |
| 667-401 | Lumen | BALTIMORE | 2012-11-20 | yes | yes |
| 667-402 | Telnyx | BALTIMORE | 2016-12-02 | yes | yes |
| 667-403 | Onvoy | TOWSON | 2021-09-01 | yes | yes |
| 667-404 | T-Mobile | PRINCEFRCK | 2022-02-25 | yes | yes |
| 667-405 | T-Mobile | GLENBURNIE | 2022-03-22 | yes | yes |
| 667-406 | T-Mobile | BALTIMORE | 2022-05-18 | yes | yes |
| 667-407 | Onvoy | BALTIMORE | 2022-05-19 | yes | yes |
| 667-408 | Verizon | ANNAPOLIS | 2022-05-20 | yes | yes |
| 667-409 | Bandwidth | PARKVILLE | 2022-08-03 | yes | yes |
| 667-410 | AT&T | SEVERN | 2022-08-16 | yes | yes |
| 667-412 | NUSO, LLC | EASTON | 2022-08-16 | yes | yes |
| 667-413 | NUSO, LLC | ARGRGBSNIS | 2022-08-16 | yes | yes |
| 667-414 | Bandwidth | BALTIMORE | 2022-09-28 | yes | yes |
| 667-415 | T-Mobile | ABERDEEN | 2022-10-11 | yes | yes |
| 667-416 | Bandwidth | ESSEX | 2022-10-18 | yes | yes |
| 667-417 | Bandwidth | GLENBURNIE | 2022-10-25 | yes | yes |
| 667-418 | Comcast | GREENSBORO | 2022-10-27 | yes | yes |
| 667-419 | AT&T | CATONSVL | 2022-11-08 | yes | yes |
| 667-420 | Dish | FEDERALSBG | 2022-11-23 | yes | yes |
| 667-421 | Telnyx | COLUMBIA | – | yes | yes |
| 667-422 | Lumen | BALTIMORE | 2022-12-16 | yes | yes |
| 667-423 | T-Mobile | ANNAPOLIS | 2023-01-06 | yes | yes |
| 667-424 | Verizon | ODENTON | 2023-02-08 | yes | yes |
| 667-425 | NUSO, LLC | BALTIMORE | 2023-02-10 | yes | yes |
| 667-426 | Onvoy | TANEYTOWN | 2021-03-25 | yes | yes |
| 667-427 | Onvoy | WEST RIVER | 2021-03-25 | yes | yes |
| 667-428 | NUSO, LLC | SALISBURY | 2023-02-10 | yes | yes |
| 667-429 | AT&T | PIKESVILLE | 2023-02-13 | yes | yes |
| 667-430 | AT&T | PIKESVILLE | 2023-04-05 | yes | yes |
| 667-431 | T-Mobile | ARBUTUS | 2023-04-13 | yes | yes |
| 667-432 | AT&T | CATONSVL | 2023-04-20 | yes | yes |
| 667-433 | AT&T | CATONSVL | 2023-05-03 | yes | yes |
| 667-434 | T-Mobile | BALTIMORE | 2023-05-05 | yes | yes |
| 667-435 | Onvoy | BALTIMORE | 2023-05-17 | yes | yes |
| 667-436 | T-Mobile | TOWSON | 2023-05-19 | yes | yes |
| 667-437 | T-Mobile | BALTIMORE | 2023-06-28 | yes | yes |
| 667-438 | AT&T | CATONSVL | 2023-07-19 | yes | yes |
| 667-439 | T-Mobile | PIKESVILLE | 2023-07-20 | yes | yes |
| 667-440 | Onvoy | BALTIMORE | 2023-07-25 | yes | yes |
| 667-441 | AT&T | PARKVILLE | 2023-07-26 | yes | yes |
| 667-442 | AT&T | ESSEX | 2023-08-02 | yes | yes |
| 667-443 | T-Mobile | CHASE | 2023-10-19 | yes | yes |
| 667-444 | Onvoy | BALTIMORE | 2015-08-17 | yes | yes |
| 667-445 | T-Mobile | CATONSVL | 2023-08-09 | yes | yes |
| 667-446 | TON80 COMMUNICATIONS, LLC | ELKRIDGE | 2022-03-01 | yes | yes |
| 667-447 | T-Mobile | COLUMBIA | 2023-08-23 | yes | yes |
| 667-448 | AT&T | REISTERSTN | 2023-08-25 | yes | yes |
| 667-449 | COMMIO, LLC | PRESTON | 2023-08-31 | yes | yes |
| 667-450 | T-Mobile | ABERDEEN | 2023-08-31 | yes | yes |
| 667-451 | AT&T | FORK | 2023-09-11 | yes | yes |
| 667-452 | AT&T | CATONSVL | 2023-09-14 | yes | yes |
| 667-453 | T-Mobile | PRINCEFRCK | 2023-09-20 | yes | yes |
| 667-454 | Vonage | BEL AIR | 2023-10-17 | yes | yes |
| 667-455 | Vonage | EDGEWOOD | 2023-10-24 | yes | yes |
| 667-456 | AT&T | DUNDALK | 2023-11-06 | yes | yes |
| 667-457 | COMMIO, LLC | CHURCHHILL | 2023-11-21 | yes | yes |
| 667-458 | Verizon | ANNAPOLIS | 2016-05-10 | yes | yes |
| 667-459 | COMMIO, LLC | OXFORD | 2023-11-21 | yes | yes |
| 667-460 | AT&T | PIKESVILLE | 2023-11-28 | yes | yes |
| 667-461 | FIVE9, INC. | BALTIMORE | 2023-12-01 | yes | yes |
| 667-462 | Dish | ELKTON | 2023-12-01 | yes | yes |
| 667-463 | FIVE9, INC. | DARLINGTON | 2023-12-27 | yes | yes |
| 667-464 | TON80 COMMUNICATIONS, LLC | BALTIMORE | 2022-01-28 | yes | yes |
| 667-465 | T-Mobile | ABERDEEN | 2024-01-11 | yes | yes |
| 667-466 | TON80 COMMUNICATIONS, LLC | HAVREGRACE | 2022-02-24 | yes | yes |
| 667-467 | Charter | DENTON | 2021-06-17 | yes | yes |
| 667-468 | TON80 COMMUNICATIONS, LLC | NANTICOKE | 2022-03-01 | yes | yes |
| 667-469 | Onvoy | BEL AIR | 2024-02-02 | yes | yes |
| 667-470 | AT&T | GLENBURNIE | 2024-03-08 | yes | yes |
| 667-471 | AT&T | PIKESVILLE | 2024-03-14 | yes | yes |
| 667-472 | Onvoy | PRINCEANNE | 2024-03-18 | yes | yes |
| 667-473 | CORE COMMUNICATIONS, INC.- MD | SOLOMONS | 2018-10-16 | yes | yes |
| 667-474 | Onvoy | ARGRGBSNIS | 2024-03-20 | yes | yes |
| 667-475 | Onvoy | CROFTON | 2024-03-21 | yes | yes |
| 667-476 | Onvoy | GLENWOOD | 2021-03-25 | yes | yes |
| 667-477 | Onvoy | HAMPSTEAD | 2021-03-25 | yes | yes |
| 667-478 | Onvoy | SYKESVILLE | 2024-03-21 | yes | yes |
| 667-479 | Onvoy | ELLICOTTCY | 2024-03-21 | yes | yes |
| 667-480 | Onvoy | WATERLO236 | 2024-03-26 | yes | yes |
| 667-481 | T-Mobile | ABERDEEN | 2024-03-29 | yes | yes |
| 667-482 | AT&T | CATONSVL | 2024-05-01 | yes | yes |
| 667-483 | TON80 COMMUNICATIONS, LLC | DEALISLAND | 2022-03-04 | yes | yes |
| 667-484 | Dish | WESTMINSTR | 2024-05-08 | yes | yes |
| 667-485 | Verizon | CAMBRIDGE | 2024-05-17 | yes | yes |
| 667-486 | T-Mobile | PRINCEFRCK | 2024-05-17 | yes | yes |
| 667-487 | CALLWORKS CORPORATION | BALTIMORE | 2024-05-20 | yes | yes |
| 667-488 | CALLWORKS CORPORATION | SALISBURY | 2024-05-20 | yes | yes |
| 667-489 | Onvoy | HAMPSTEAD | 2024-06-13 | yes | yes |
| 667-490 | AT&T | PIKESVILLE | 2024-06-27 | yes | yes |
| 667-491 | AT&T | PIKESVILLE | 2024-09-03 | yes | yes |
| 667-492 | Verizon | SEVERN | 2024-05-31 | yes | yes |
| 667-493 | T-Mobile | ANNAPOLIS | 2024-09-24 | yes | yes |
| 667-494 | T-Mobile | ABERDEEN | 2024-10-29 | yes | yes |
| 667-495 | LEAP TELECOM, LLC | BALTIMORE | 2024-11-01 | yes | yes |
| 667-496 | LEAP TELECOM, LLC | SALISBURY | 2024-11-06 | yes | yes |
| 667-497 | AT&T | OCEAN CITY | 2024-10-22 | yes | yes |
| 667-498 | AT&T | ARBUTUS | 2024-11-21 | yes | yes |
| 667-499 | AT&T | PIKESVILLE | 2024-12-02 | yes | yes |
| 667-500 | CORE COMMUNICATIONS, INC.- MD | ANNAPOLIS | 2018-06-01 | yes | yes |
| 667-501 | AT&T | DUNDALK | 2024-12-19 | yes | yes |
| 667-502 | AT&T | COLUMBIA | 2024-12-27 | yes | yes |
| 667-503 | Charter | BALTIMORE | 2025-01-29 | yes | yes |
| 667-504 | AT&T | BALTIMORE | 2025-02-10 | yes | yes |
| 667-505 | AT&T | PIKESVILLE | 2025-02-20 | yes | yes |
| 667-506 | AT&T | BALTIMORE | 2025-03-07 | yes | yes |
| 667-507 | AT&T | SEVERN | 2025-03-27 | yes | yes |
| 667-508 | AT&T | WOODLAWN | 2025-04-29 | yes | yes |
| 667-509 | T-Mobile | SEVERNA PK | 2025-05-14 | yes | yes |
| 667-510 | AT&T | PIKESVILLE | 2025-05-15 | yes | yes |
| 667-512 | AT&T | PIKESVILLE | 2025-05-15 | yes | yes |
| 667-513 | LEAP TELECOM, LLC | BALTIMORE | 2025-05-20 | yes | yes |
| 667-514 | AT&T | BALTIMORE | 2025-05-20 | yes | no |
| 667-515 | AT&T | BALTIMORE | 2025-06-06 | yes | yes |
| 667-516 | AT&T | BALTIMORE | 2025-06-17 | yes | yes |
| 667-517 | T-Mobile | CATONSVL | 2024-10-21 | yes | yes |
| 667-518 | AT&T | BALTIMORE | 2025-06-17 | yes | yes |
| 667-519 | AT&T | BALTIMORE | 2025-06-17 | yes | yes |
| 667-520 | T-Mobile | ABERDEEN | 2025-06-26 | yes | yes |
| 667-521 | AT&T | PIKESVILLE | 2025-07-10 | yes | yes |
| 667-522 | T-Mobile | ABERDEEN | 2025-07-29 | yes | yes |
| 667-523 | AT&T | ODENTON | 2025-08-05 | yes | yes |
| 667-524 | Bandwidth | SALISBURY | 2025-08-12 | yes | yes |
| 667-525 | Onvoy | BALTIMORE | 2025-08-13 | yes | yes |
| 667-526 | TON80 COMMUNICATIONS, LLC | CENTREVL | 2022-03-03 | yes | yes |
| 667-527 | Dish | GLENBURNIE | 2025-09-04 | yes | yes |
| 667-528 | T-Mobile | ABERDEEN | 2025-09-03 | yes | yes |
| 667-529 | FRACTEL, LLC | HURLOCK | 2021-06-03 | yes | yes |
| 667-530 | T-Mobile | ABERDEEN | 2025-09-18 | yes | yes |
| 667-531 | T-Mobile | ABERDEEN | 2025-10-31 | yes | yes |
| 667-532 | Onvoy | PARKVILLE | 2025-11-04 | yes | yes |
| 667-533 | WAVENATION, LLC | PIKESVILLE | 2025-11-26 | yes | yes |
| 667-534 | WAVENATION, LLC | SALISBURY | 2025-11-26 | yes | yes |
| 667-535 | Dish | RISING SUN | 2025-12-09 | yes | yes |
| 667-536 | Dish | STILL POND | – | yes | no |
| 667-537 | AT&T | ESSEX | 2026-01-15 | yes | yes |
| 667-538 | Onvoy | CHURCHVL | 2026-01-27 | yes | yes |
| 667-539 | AT&T | BALTIMORE | 2026-02-20 | yes | yes |
| 667-540 | AT&T | PIKESVILLE | 2026-03-03 | yes | yes |
| 667-541 | AT&T | GLENBURNIE | 2026-03-18 | yes | yes |
| 667-543 | AT&T | PIKESVILLE | 2026-03-18 | yes | yes |
| 667-544 | AT&T | PIKESVILLE | 2026-03-18 | yes | yes |
| 667-545 | CORE COMMUNICATIONS, INC.- MD | WARWICK | 2018-10-16 | yes | yes |
| 667-546 | Verizon | PRINCEFRCK | 2026-03-27 | yes | yes |
| 667-547 | TPx | BALTIMORE | 2026-05-07 | yes | yes |
| 667-548 | Onvoy | TOWSON | 2026-06-01 | yes | yes |
| 667-549 | AT&T | ANNAPOLIS | 2026-01-05 | yes | yes |
| 667-550 | AT&T | COLUMBIA | 2026-06-24 | yes | yes |
| 667-551 | Onvoy | ANNAPOLIS | 2026-07-02 | yes | no |
| 667-552 | AT&T | SEVERNA PK | 2026-07-08 | yes | yes |
| 667-553 | TPx | SUDLERSVL | 2026-07-27 | yes | no |
| 667-554 | AT&T | COLUMBIA | 2026-09-09 | yes | no |
| 667-556 | Onvoy | BEL AIR | 2026-09-09 | yes | no |
| 667-557 | AT&T | CATONSVL | 2026-09-16 | yes | no |
| 667-558 | Onvoy | BALTIMORE | 2026-10-20 | yes | no |
| 667-559 | AT&T | ARGRGBSNIS | 2026-10-23 | yes | no |
| 667-560 | T-Mobile | BALTIMORE | 2026-08-05 | yes | yes |
| 667-561 | AT&T | SEVERNA PK | 2026-10-29 | yes | no |
| 667-566 | COMMIO, LLC | STEVENSVL | 2022-09-15 | yes | yes |
| 667-567 | Onvoy | HAVREGRACE | 2021-03-25 | yes | yes |
| 667-570 | T-Mobile | BALTIMORE | 2026-08-25 | yes | no |
| 667-576 | Onvoy | JARRETTSVL | 2021-03-25 | yes | yes |
| 667-577 | FRACTEL, LLC | ELKTON | 2020-07-15 | yes | yes |
| 667-596 | AT&T | PIKESVILLE | 2024-11-06 | yes | yes |
| 667-600 | EVOLVE CELLULAR, INC. | BALTIMORE | 2015-09-22 | yes | yes |
| 667-622 | TON80 COMMUNICATIONS, LLC | PIKESVILLE | 2022-03-23 | yes | yes |
| 667-626 | TON80 COMMUNICATIONS, LLC | CATONSVL | 2022-03-01 | yes | yes |
| 667-627 | CORE COMMUNICATIONS, INC.- MD | ANNAPOLIS | 2018-10-18 | yes | yes |
| 667-644 | Charter | SEVERNA PK | 2021-04-26 | yes | yes |
| 667-646 | TON80 COMMUNICATIONS, LLC | ANNAPOLIS | 2021-02-11 | yes | yes |
| 667-647 | Charter | NORTH EAST | 2021-04-26 | yes | yes |
| 667-653 | CORE COMMUNICATIONS, INC.- MD | BRYNPKLNCM | 2018-12-11 | yes | yes |
| 667-656 | Charter | EDGEWOOD | 2021-05-27 | yes | yes |
| 667-657 | Onvoy | CHASE | 2021-03-25 | yes | yes |
| 667-660 | Onvoy | MARION | 2019-10-10 | yes | yes |
| 667-661 | Onvoy | SNOW HILL | 2019-10-10 | yes | yes |
| 667-662 | Onvoy | SMITH IS | 2019-10-10 | yes | yes |
| 667-663 | Onvoy | OCEAN CITY | 2019-10-10 | yes | yes |
| 667-664 | Onvoy | TRAPPE | 2019-10-10 | yes | yes |
| 667-665 | Charter | HILLSBORO | 2021-06-17 | yes | yes |
| 667-666 | Onvoy | WEST RIVER | – | yes | yes |
| 667-667 | Onvoy | PIKESVILLE | 2025-08-20 | yes | yes |
| 667-668 | Charter | FALLSTON | 2021-04-26 | yes | yes |
| 667-669 | Charter | GALENA | 2021-06-17 | yes | yes |
| 667-670 | Onvoy | SUDLERSVL | 2021-03-18 | yes | yes |
| 667-676 | Onvoy | WILLARDS | 2020-09-21 | yes | yes |
| 667-677 | Onvoy | BALTIMORE | 2015-05-08 | yes | yes |
| 667-678 | Onvoy | COLUMBIA | 2021-08-31 | yes | yes |
| 667-686 | CORE COMMUNICATIONS, INC.- MD | ELLICOTTCY | 2018-10-15 | yes | yes |
| 667-687 | Onvoy | WARWICK | 2021-03-18 | yes | yes |
| 667-688 | FRACTEL, LLC | PARKVILLE | 2020-07-15 | yes | yes |
| 667-693 | TON80 COMMUNICATIONS, LLC | VIENNA | 2022-03-23 | yes | yes |
| 667-701 | AT&T | ELKRIDGE | 2015-10-19 | yes | yes |
| 667-706 | T-Mobile | ELKTON | 2016-05-23 | yes | yes |
| 667-722 | CORE COMMUNICATIONS, INC.- MD | GLENWOOD | 2018-10-15 | yes | yes |
| 667-727 | CORE COMMUNICATIONS, INC.- MD | SUDLERSVL | 2018-10-16 | yes | yes |
| 667-737 | TON80 COMMUNICATIONS, LLC | PERRYVILLE | 2022-03-01 | yes | yes |
| 667-738 | OPENTACT INC. | SALISBURY | 2026-03-27 | yes | yes |
| 667-743 | TON80 COMMUNICATIONS, LLC | QUEENSTOWN | 2022-03-09 | yes | yes |
| 667-746 | TON80 COMMUNICATIONS, LLC | GLENWOOD | 2022-02-24 | yes | yes |
| 667-755 | QUANTUM TELECOMMUNICATIONS, INC. - MD | PIKESVILLE | 2021-09-29 | yes | yes |
| 667-758 | FRACTEL, LLC | SILVER RUN | 2020-07-15 | yes | yes |
| 667-766 | Onvoy | STEVENSVL | 2021-03-18 | yes | yes |
| 667-767 | Onvoy | STMICHAELS | 2021-03-18 | yes | yes |
| 667-770 | AIRUS, INC. - MD | BALTIMORE | 2015-07-23 | yes | yes |
| 667-771 | WIDE VOICE, LLC - MD | BALTIMORE | 2015-12-04 | yes | yes |
| 667-772 | Charter | SPARKSGLNC | 2021-04-26 | yes | yes |
| 667-775 | Charter | MILLINGTON | 2021-06-17 | yes | yes |
| 667-776 | HD CARRIER LLC | BALTIMORE | 2019-09-24 | yes | yes |
| 667-777 | Peerless | SEVERNA PK | 2014-07-08 | yes | yes |
| 667-778 | Charter | SPARROWSPT | 2021-04-26 | yes | yes |
| 667-786 | AT&T | COLUMBIA | 2015-11-04 | yes | yes |
| 667-788 | QUANTUM TELECOMMUNICATIONS, INC. - MD | WESTMINSTR | 2021-10-22 | yes | yes |
| 667-800 | Onvoy | SALISBURY | 2016-08-16 | yes | yes |
| 667-802 | T-Mobile | CATONSVL | 2015-02-20 | yes | yes |
| 667-803 | Bandwidth | SOLOMONS | 2013-08-16 | yes | yes |
| 667-808 | Peerless | EASTON | 2016-08-23 | yes | yes |
| 667-810 | Onvoy | SALISBURY | 2021-03-03 | yes | yes |
| 667-812 | Verizon | WATERLO236 | 2015-08-14 | yes | yes |
| 667-824 | TON80 COMMUNICATIONS, LLC | EDGEWOOD | 2022-01-13 | yes | yes |
| 667-827 | TON80 COMMUNICATIONS, LLC | BERLIN | 2022-03-14 | yes | yes |
| 667-832 | TON80 COMMUNICATIONS, LLC | BRYNPKLNCM | 2022-02-24 | yes | yes |
| 667-837 | CORE COMMUNICATIONS, INC.- MD | PT DEPOSIT | 2018-10-16 | yes | yes |
| 667-842 | FRACTEL, LLC | WOODLAWN | 2020-07-15 | yes | yes |
| 667-843 | CORE COMMUNICATIONS, INC.- MD | DEALISLAND | 2018-12-10 | yes | yes |
| 667-846 | TON80 COMMUNICATIONS, LLC | COCKEYSVL | 2022-02-24 | yes | yes |
| 667-848 | TON80 COMMUNICATIONS, LLC | ABERDEEN | 2021-03-18 | yes | yes |
| 667-853 | CORETEL MARYLAND, INC. - MD | POCOMOKE | 2019-09-12 | yes | yes |
| 667-855 | TERRA NOVA TELECOM INC. | SALISBURY | 2019-02-22 | yes | yes |
| 667-856 | TON80 COMMUNICATIONS, LLC | DUNDALK | 2022-03-01 | yes | yes |
| 667-866 | CORE COMMUNICATIONS, INC.- MD | DARLINGTON | 2018-06-04 | yes | yes |
| 667-867 | COMMIO, LLC | BALTIMORE | 2017-06-20 | yes | yes |
| 667-868 | Charter | CRISFIELD | 2018-03-09 | yes | yes |
| 667-876 | CORE COMMUNICATIONS, INC.- MD | ANNAPOLIS | 2018-10-18 | yes | yes |
| 667-877 | COMMIO, LLC | PIKESVILLE | 2022-09-15 | yes | yes |
| 667-887 | Onvoy | WORTHINGTN | 2021-03-25 | yes | yes |
| 667-888 | Onvoy | BALTIMORE | – | yes | yes |
| 667-890 | AT&T | ODENTON | 2023-06-14 | yes | yes |
| 667-891 | AT&T | ODENTON | 2023-06-14 | yes | yes |
| 667-892 | AT&T | ODENTON | 2023-06-14 | yes | yes |
| 667-893 | AT&T | ODENTON | 2023-06-14 | yes | yes |
| 667-894 | AT&T | ODENTON | 2023-06-14 | yes | yes |
| 667-895 | Twilio | BALTIMORE | 2020-10-15 | yes | yes |
| 667-897 | Twilio | CHESAPKECY | 2022-03-30 | yes | yes |
| 667-899 | FRACTEL, LLC | BALTIMORE | 2021-10-25 | yes | yes |
| 667-900 | TERRA NOVA TELECOM INC. | BALTIMORE | 2019-02-20 | yes | yes |
| 667-910 | Onvoy | BALTIMORE | 2021-03-03 | yes | yes |
| 667-925 | CORETEL MARYLAND, INC. - MD | BEL AIR | 2021-09-23 | yes | yes |
| 667-930 | Peerless | BALTIMORE | 2015-03-17 | yes | yes |
| 667-942 | TON80 COMMUNICATIONS, LLC | ABERDEEN | 2022-02-07 | yes | yes |
| 667-946 | CORE COMMUNICATIONS, INC.- MD | CHURCHVL | 2018-10-15 | yes | yes |
| 667-962 | Onvoy | NORTHBEACH | 2021-03-25 | yes | yes |
| 667-966 | Onvoy | NEWWINDSOR | 2021-03-25 | yes | yes |
| 667-967 | BARR TELL USA, INC. | GLENBURNIE | 2016-11-22 | yes | yes |
| 667-977 | FRACTEL, LLC | SALISBURY | 2020-07-02 | yes | yes |
| 667-999 | Onvoy | ELKRIDGE | 2015-03-23 | yes | yes |
Frequently asked
How many prefixes does area code 667 have?
454 NXX blocks are assigned of 786 possible. Each block is 10,000 consecutive numbers, so the code currently covers about 4,540 thousand-number ranges across 102 rate centers.
What do the first three digits after 667 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 667 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 667 table?
That the block is in thousands-block pooling: carriers draw 1,000-number lots from it instead of taking all 10,000. 454 of 667'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.
More about this code: overview · carriers · spam complaints · local time