Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records
Area code 520 prefixes
699 of the 786 possible NXX blocks are assigned in area code 520 (88.9% of capacity), spread across 37 rate centers and 52 holders. The largest holders are QWEST CORPORATION (200 blocks, 28.6%), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ (104 blocks, 14.9%), T-MOBILE USA, INC. (84 blocks, 12.0%). Grouped by brand, Lumen accounts for 232 blocks; brand-attributable holders cover 89% 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 2001-01-08 to 2026-10-30, with 35 blocks handed out in 2021 alone. 492 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. 5 assigned blocks (768, 769, 773, 774, 890) are not yet in service: assigned to a carrier but not open for calls, so a caller ID from one is spoofed. 257 were growth assignments – additional blocks to a carrier that had already filled its earlier ones.
699 assigned blocks of 786
37 rate centers
52 holders of record
70% in thousands-block pooling
Largest holders in 520
| Holder of record, as NANPA names it | Brand | Blocks | Share |
|---|---|---|---|
| QWEST CORPORATION | Lumen | 200 | 28.6% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | Verizon | 104 | 14.9% |
| T-MOBILE USA, INC. | T-Mobile | 84 | 12% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 53 | 7.6% |
| ONVOY, LLC - AZ | Onvoy | 47 | 6.7% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | Verizon | 24 | 3.4% |
| LEVEL 3 COMMUNICATIONS, LLC - AZ | Lumen | 17 | 2.4% |
| BANDWIDTH.COM CLEC, LLC - AZ | Bandwidth | 17 | 2.4% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | AT&T | 14 | 2% |
| LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | Lumen | 12 | 1.7% |
| METROPCS, INC. | T-Mobile | 11 | 1.6% |
| IP HORIZON LLC | – | 11 | 1.6% |
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.
All 699 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 |
|---|---|---|---|---|---|
| 520-200 | Allstream | HAYDEN | 2002-10-24 | yes | yes |
| 520-201 | Allstream | SAN MANUEL | 2002-10-24 | yes | yes |
| 520-202 | Lumen | TUCSON | – | – | yes |
| 520-203 | Verizon | TUCSON | 2003-08-13 | yes | yes |
| 520-204 | Windstream | TUCSON | 2003-12-04 | yes | yes |
| 520-205 | Lumen | TUCSON | – | yes | yes |
| 520-206 | Lumen | TUCSON | – | – | yes |
| 520-207 | Comcast | TUCSON | – | yes | yes |
| 520-208 | Lumen | CASAGRANDE | 2001-01-08 | yes | yes |
| 520-209 | Lumen | TUCSON | – | – | yes |
| 520-210 | Onvoy | TOMBSTONE | 2013-08-20 | yes | yes |
| 520-212 | MIDVALE TELEPHONE EXCHANGE, INC. | CASCABEL | – | – | yes |
| 520-213 | T-Mobile | CASAGRANDE | 2013-06-25 | yes | yes |
| 520-214 | Onvoy | TUCSON | 2015-11-19 | yes | yes |
| 520-215 | GILA RIVER TELECOMM, INC. | BLACKWATER | – | – | yes |
| 520-216 | Verizon | NOGALES | – | yes | yes |
| 520-217 | Lumen | CASAGRANDE | 2015-12-29 | yes | yes |
| 520-218 | Lumen | TUCSON | – | – | yes |
| 520-219 | Lumen | TUCSON | – | – | yes |
| 520-220 | T-Mobile | SIERRAVIST | 2002-05-31 | yes | yes |
| 520-221 | Verizon | BENSON | 2003-04-08 | yes | yes |
| 520-222 | Lumen | TUCSON | 2011-10-06 | yes | yes |
| 520-223 | Lumen | NOGALES | 2002-04-09 | yes | yes |
| 520-224 | Allstream | SIERRAVIST | – | yes | yes |
| 520-225 | Lumen | TUCSON | – | yes | yes |
| 520-226 | Lumen | SIERRAVIST | 2002-04-09 | yes | yes |
| 520-227 | T-Mobile | SIERRAVIST | 2002-05-16 | yes | yes |
| 520-228 | Lumen | TUCSON | – | – | yes |
| 520-229 | Lumen | TUCSON | – | yes | yes |
| 520-230 | Verizon | TUCSON | – | yes | yes |
| 520-231 | Bandwidth | WHITLOW | – | yes | yes |
| 520-232 | Lumen | TUCSON | – | yes | yes |
| 520-233 | Onvoy | CASAGRANDE | – | yes | yes |
| 520-234 | T-Mobile | SIERRAVIST | 2002-11-06 | yes | yes |
| 520-235 | Verizon | TUCSON | – | – | yes |
| 520-236 | T-Mobile | SIERRAVIST | 2002-09-17 | yes | yes |
| 520-237 | Verizon | TUCSON | – | – | yes |
| 520-238 | T-Mobile | YUMA | – | yes | yes |
| 520-239 | AT&T | TUCSON | – | yes | yes |
| 520-240 | Verizon | TUCSON | – | – | yes |
| 520-241 | AT&T | TUCSON | – | – | yes |
| 520-242 | Verizon | WILLCOX | 2021-10-28 | yes | yes |
| 520-243 | Lumen | TUCSON | – | yes | yes |
| 520-244 | T-Mobile | TUCSON | 2016-03-14 | yes | yes |
| 520-245 | T-Mobile | TUCSON | – | – | yes |
| 520-246 | Lumen | TUCSON | 2020-10-30 | yes | yes |
| 520-247 | AT&T | TUCSON | 2001-01-18 | – | yes |
| 520-248 | T-Mobile | TUCSON | – | yes | yes |
| 520-249 | T-Mobile | SIERRAVIST | – | yes | yes |
| 520-250 | T-Mobile | TUCSON | – | yes | yes |
| 520-251 | T-Mobile | CASAGRANDE | – | yes | yes |
| 520-252 | T-Mobile | CASAGRANDE | – | yes | yes |
| 520-253 | Verizon | WILLCOX | 2003-04-08 | yes | yes |
| 520-254 | Lumen | WILLCOX | 2004-04-02 | yes | yes |
| 520-255 | Verizon | SIERRAVIST | 2004-04-28 | yes | yes |
| 520-256 | T-Mobile | TUCSON | 2001-01-29 | yes | yes |
| 520-257 | T-Mobile | TUCSON | 2014-08-19 | yes | yes |
| 520-258 | Lumen | TUCSON | – | yes | yes |
| 520-259 | NORTH COUNTY COMMUNICATIONS CORPORATION | TUCSON | – | – | yes |
| 520-260 | Verizon | TUCSON | – | yes | yes |
| 520-261 | Bandwidth | TUCSON | 2009-07-16 | yes | yes |
| 520-262 | Verizon | TUCSON | 2010-02-17 | yes | yes |
| 520-263 | Comcast | SIERRAVIST | – | yes | yes |
| 520-264 | Verizon | NOGALES | – | yes | yes |
| 520-265 | T-Mobile | BENSON | 2002-08-09 | yes | yes |
| 520-266 | T-Mobile | SIERRAVIST | 2002-08-09 | yes | yes |
| 520-267 | NORTH COUNTY COMMUNICATIONS CORPORATION | SIERRAVIST | – | – | yes |
| 520-268 | Verizon | TUCSON | 2013-03-14 | yes | yes |
| 520-269 | Verizon | TUCSON | 2007-02-05 | yes | yes |
| 520-270 | T-Mobile | TUCSON | – | – | yes |
| 520-271 | T-Mobile | TUCSON | – | yes | yes |
| 520-272 | AT&T | TUCSON | – | – | yes |
| 520-273 | AT&T | TUCSON | 2014-08-19 | yes | yes |
| 520-274 | T-Mobile | TUCSON | 2016-09-14 | yes | yes |
| 520-275 | AT&T | TUCSON | – | – | yes |
| 520-276 | Bandwidth | TUCSON | 2014-10-30 | yes | yes |
| 520-277 | Onvoy | WHITLOW | 2012-05-08 | yes | yes |
| 520-278 | T-Mobile | TUCSON | 2014-08-28 | yes | yes |
| 520-279 | Verizon | TUCSON | 2014-02-18 | yes | yes |
| 520-280 | T-Mobile | CASAGRANDE | – | yes | yes |
| 520-281 | Lumen | NOGALES | – | – | yes |
| 520-282 | Verizon | TUCSON | – | yes | yes |
| 520-283 | T-Mobile | TUCSON | 2014-09-23 | yes | yes |
| 520-284 | Verizon | TUCSON | 2009-03-17 | yes | yes |
| 520-285 | Lumen | NOGALES | – | yes | yes |
| 520-286 | T-Mobile | TUCSON | 2013-01-11 | yes | yes |
| 520-287 | Lumen | NOGALES | – | – | yes |
| 520-288 | AT&T | TUCSON | 2011-04-21 | yes | yes |
| 520-289 | Verizon | TUCSON | 2006-06-28 | yes | yes |
| 520-290 | Lumen | TUCSON | – | – | yes |
| 520-291 | Lumen | TUCSON | – | – | yes |
| 520-292 | Lumen | TUCSON | – | – | yes |
| 520-293 | Lumen | TUCSON | – | – | yes |
| 520-294 | Lumen | TUCSON | – | – | yes |
| 520-295 | Lumen | TUCSON | – | – | yes |
| 520-296 | Lumen | TUCSON | – | – | yes |
| 520-297 | Lumen | TUCSON | – | – | yes |
| 520-298 | Lumen | TUCSON | – | – | yes |
| 520-299 | Lumen | TUCSON | – | – | yes |
| 520-300 | Verizon | TUCSON | 2007-03-22 | yes | yes |
| 520-301 | AT&T | TUCSON | 2007-05-03 | yes | yes |
| 520-302 | AT&T | TUCSON | 2007-02-12 | yes | yes |
| 520-303 | Onvoy | TUCSON | 2008-01-02 | yes | yes |
| 520-304 | AT&T | TUCSON | – | – | yes |
| 520-305 | Verizon | TUCSON | 2007-10-09 | yes | yes |
| 520-306 | Verizon | TUCSON | 2009-03-12 | yes | yes |
| 520-307 | Verizon | TUCSON | – | – | yes |
| 520-308 | AT&T | TUCSON | 2009-09-09 | yes | yes |
| 520-309 | AT&T | TUCSON | 2005-09-30 | yes | yes |
| 520-310 | Verizon | TUCSON | 2009-09-09 | yes | yes |
| 520-312 | AT&T | TUCSON | – | – | yes |
| 520-313 | T-Mobile | NOGALES | 2001-05-15 | yes | yes |
| 520-314 | Lumen | TUCSON | 2011-02-09 | yes | yes |
| 520-315 | GILA RIVER TELECOMM, INC. | CASABLANCA | – | – | yes |
| 520-316 | Lumen | CASAGRANDE | – | – | yes |
| 520-317 | Onvoy | HAYDEN | 2016-07-13 | yes | yes |
| 520-318 | Lumen | TUCSON | – | – | yes |
| 520-319 | Lumen | TUCSON | – | – | yes |
| 520-320 | Lumen | TUCSON | – | – | yes |
| 520-321 | Lumen | TUCSON | – | – | yes |
| 520-322 | Lumen | TUCSON | – | – | yes |
| 520-323 | Lumen | TUCSON | – | – | yes |
| 520-324 | Lumen | TUCSON | – | – | yes |
| 520-325 | Lumen | TUCSON | – | – | yes |
| 520-326 | Lumen | TUCSON | – | – | yes |
| 520-327 | Lumen | TUCSON | – | – | yes |
| 520-328 | Lumen | TUCSON | 2014-05-14 | yes | yes |
| 520-329 | AT&T | TUCSON | 2010-06-28 | yes | yes |
| 520-330 | Verizon | TUCSON | 2016-07-06 | yes | yes |
| 520-331 | T-Mobile | TUCSON | – | – | yes |
| 520-332 | T-Mobile | TUCSON | 2012-05-17 | yes | yes |
| 520-333 | Verizon | TUCSON | 2010-12-17 | yes | yes |
| 520-334 | Verizon | TUCSON | 2008-10-02 | yes | yes |
| 520-335 | Comcast | SIERRAVIST | – | yes | yes |
| 520-336 | AT&T | TUCSON | 2009-02-13 | yes | yes |
| 520-337 | Lumen | WILLCOX | 2008-05-05 | yes | yes |
| 520-338 | Onvoy | TUCSON | 2011-10-07 | yes | yes |
| 520-339 | AT&T | TUCSON | 2008-09-12 | yes | yes |
| 520-340 | Verizon | CASAGRANDE | 2016-09-01 | yes | yes |
| 520-341 | Telnyx | NOGALES | 2016-12-09 | yes | yes |
| 520-342 | Onvoy | TUCSON | 2007-03-08 | yes | yes |
| 520-343 | Verizon | TUCSON | 2007-05-23 | yes | yes |
| 520-344 | AT&T | TUCSON | 2007-04-24 | yes | yes |
| 520-345 | Verizon | TUCSON | 2013-01-11 | yes | yes |
| 520-346 | Peerless | BISBEE | 2018-09-21 | yes | yes |
| 520-347 | Telnyx | TUCSON | – | yes | yes |
| 520-348 | Lumen | WILLCOX | 2015-06-22 | yes | yes |
| 520-349 | Verizon | TUCSON | – | – | yes |
| 520-350 | GILA LOCAL EXCHANGE CARRIER, INC. - AZ | CASAGRANDE | 2008-05-14 | yes | yes |
| 520-351 | Lumen | TUCSON | 2005-10-11 | yes | yes |
| 520-352 | Allstream | TUCSON | – | yes | yes |
| 520-353 | Onvoy | BISBEE | 2012-05-08 | yes | yes |
| 520-354 | Verizon | TUCSON | 2016-10-27 | yes | yes |
| 520-355 | Bandwidth | TUCSON | 2012-09-07 | yes | yes |
| 520-356 | Lumen | HAYDEN | – | yes | yes |
| 520-357 | Lumen | HAYDEN | – | yes | yes |
| 520-358 | AT&T | TUCSON | 2001-03-06 | – | yes |
| 520-359 | T-Mobile | TUCSON | 2014-06-24 | yes | yes |
| 520-360 | AT&T | TUCSON | – | – | yes |
| 520-361 | TOHONO O'ODHAM UTILITY AUTHORITY | SANTA ROSA | – | – | yes |
| 520-362 | TOHONO O'ODHAM UTILITY AUTHORITY | W SANSIMON | – | – | yes |
| 520-363 | Lumen | HAYDEN | – | yes | yes |
| 520-364 | Lumen | DOUGLAS | – | – | yes |
| 520-365 | T-Mobile | TUCSON | 2012-04-24 | yes | yes |
| 520-366 | Lumen | BISBEE | – | yes | yes |
| 520-367 | Charter | TUCSON | 2017-07-13 | yes | yes |
| 520-368 | Lumen | DOUGLAS | 2007-11-07 | yes | yes |
| 520-369 | Lumen | TUCSON | 2011-09-28 | yes | yes |
| 520-370 | T-Mobile | TUCSON | – | yes | yes |
| 520-371 | T-Mobile | CASAGRANDE | – | yes | yes |
| 520-372 | Comcast | TUCSON | 2019-08-05 | yes | yes |
| 520-373 | T-Mobile | TUCSON | 2012-10-31 | yes | yes |
| 520-374 | Lumen | CASAGRANDE | – | – | yes |
| 520-375 | Lumen | NOGALES | – | yes | yes |
| 520-376 | T-Mobile | SIERRAVIST | 2019-02-19 | yes | yes |
| 520-377 | Lumen | NOGALES | – | – | yes |
| 520-378 | Lumen | SIERRAVIST | – | – | yes |
| 520-379 | Onvoy | DOUGLAS | – | yes | yes |
| 520-380 | T-Mobile | CASAGRANDE | 2019-08-23 | yes | yes |
| 520-381 | Allstream | CASAGRANDE | – | yes | yes |
| 520-382 | Lumen | TUCSON | – | yes | yes |
| 520-383 | TOHONO O'ODHAM UTILITY AUTHORITY | SELLS | – | – | yes |
| 520-384 | Lumen | WILLCOX | – | – | yes |
| 520-385 | Lumen | SAN MANUEL | – | yes | yes |
| 520-386 | AT&T | BENSON | 2019-12-11 | yes | yes |
| 520-387 | TABLE TOP TELEPHONE COMPANY | AJO | – | – | yes |
| 520-388 | Lumen | TUCSON | – | yes | yes |
| 520-389 | AT&T | TUCSON | 2014-10-09 | yes | yes |
| 520-390 | T-Mobile | TUCSON | – | yes | yes |
| 520-391 | Allstream | SUPERIOR | – | yes | yes |
| 520-392 | AT&T | TUCSON | 2009-12-29 | yes | yes |
| 520-393 | Lumen | TUCSON | – | yes | yes |
| 520-394 | Lumen | NOGALES | – | yes | yes |
| 520-395 | Comcast | TUCSON | 2007-05-21 | yes | yes |
| 520-396 | Verizon | TUCSON | 2006-08-24 | yes | yes |
| 520-397 | Lumen | NOGALES | – | yes | yes |
| 520-398 | Lumen | TUCSON | – | yes | yes |
| 520-399 | Lumen | TUCSON | – | yes | yes |
| 520-400 | Verizon | TUCSON | – | – | yes |
| 520-401 | T-Mobile | TUCSON | – | yes | yes |
| 520-402 | T-Mobile | BENSON | 2016-09-14 | yes | yes |
| 520-403 | Verizon | TUCSON | – | – | yes |
| 520-404 | Verizon | TUCSON | – | – | yes |
| 520-405 | Verizon | TUCSON | – | – | yes |
| 520-406 | AT&T | TUCSON | 2001-04-16 | – | yes |
| 520-407 | Lumen | TUCSON | – | yes | yes |
| 520-408 | Lumen | TUCSON | – | – | yes |
| 520-409 | AT&T | TUCSON | – | – | yes |
| 520-410 | Lumen | TUCSON | – | – | yes |
| 520-412 | Peerless | TOMBSTONE | 2018-10-29 | yes | yes |
| 520-413 | Lumen | CASAGRANDE | 2001-04-16 | yes | yes |
| 520-414 | Lumen | CASAGRANDE | 2001-04-16 | yes | yes |
| 520-415 | MCC TELEPHONY LLC | NOGALES | 2012-03-05 | yes | yes |
| 520-416 | EXIANT COMMUNICATIONS LLC | TUCSON | 2019-09-16 | yes | yes |
| 520-417 | Lumen | SIERRAVIST | – | – | yes |
| 520-418 | GILA RIVER TELECOMM, INC. | STOTONIC | – | – | yes |
| 520-419 | Verizon | TUCSON | – | – | yes |
| 520-420 | HD CARRIER LLC | TUCSON | 2019-12-18 | yes | yes |
| 520-421 | Lumen | CASAGRANDE | – | – | yes |
| 520-422 | AT&T | BISBEE | 2012-08-13 | yes | yes |
| 520-423 | Lumen | CASAGRANDE | – | yes | yes |
| 520-424 | Lumen | CASAGRANDE | – | yes | yes |
| 520-425 | Verizon | TUCSON | 2006-11-03 | yes | yes |
| 520-426 | Lumen | CASAGRANDE | – | – | yes |
| 520-427 | T-Mobile | TUCSON | 2013-01-11 | yes | yes |
| 520-428 | AT&T | TUCSON | 2014-01-17 | yes | yes |
| 520-429 | Verizon | TUCSON | – | yes | yes |
| 520-430 | GILA RIVER TELECOMM, INC. | MARCOPAVLG | – | – | yes |
| 520-431 | AT&T | CASAGRANDE | – | yes | yes |
| 520-432 | Lumen | BISBEE | – | yes | yes |
| 520-433 | Lumen | TUCSON | 2012-11-20 | yes | yes |
| 520-434 | Lumen | TUCSON | – | yes | yes |
| 520-435 | T-Mobile | WILLCOX | 2023-05-31 | yes | yes |
| 520-436 | Onvoy | HAYDEN | 2019-10-03 | yes | yes |
| 520-437 | XO ARIZONA, INC. | TUCSON | 2006-03-30 | yes | yes |
| 520-438 | Onvoy | WHITLOW | 2019-10-03 | yes | yes |
| 520-439 | Lumen | SIERRAVIST | – | – | yes |
| 520-440 | T-Mobile | TUCSON | – | – | yes |
| 520-441 | AT&T | TUCSON | 2010-04-20 | yes | yes |
| 520-442 | Bandwidth | BENSON | 2012-09-24 | yes | yes |
| 520-443 | T-Mobile | TUCSON | 2007-06-06 | yes | yes |
| 520-444 | Verizon | TUCSON | – | – | yes |
| 520-445 | AT&T | TUCSON | – | yes | yes |
| 520-446 | Spok | TUCSON | – | – | yes |
| 520-447 | Onvoy | TUCSON | 2014-02-28 | yes | yes |
| 520-448 | Peerless | TUCSON | 2014-04-30 | yes | yes |
| 520-449 | Verizon | TUCSON | – | yes | yes |
| 520-450 | T-Mobile | CASAGRANDE | – | yes | yes |
| 520-451 | Verizon | TUCSON | 2021-10-28 | yes | yes |
| 520-452 | Lumen | SIERRAVIST | – | – | yes |
| 520-453 | Verizon | TOMBSTONE | 2020-04-20 | yes | yes |
| 520-454 | Lumen | SIERRAVIST | 2009-02-13 | yes | yes |
| 520-455 | Lumen | NOGALES | – | yes | yes |
| 520-456 | Lumen | SIERRAVIST | – | yes | yes |
| 520-457 | Lumen | TOMBSTONE | – | yes | yes |
| 520-458 | Lumen | SIERRAVIST | – | – | yes |
| 520-459 | Lumen | SIERRAVIST | – | – | yes |
| 520-460 | T-Mobile | TUCSON | 2012-09-17 | yes | yes |
| 520-461 | Allstream | TUCSON | – | yes | yes |
| 520-462 | Onvoy | TUCSON | 2017-08-17 | yes | yes |
| 520-463 | Lumen | WHITLOW | – | yes | yes |
| 520-464 | Lumen | CASAGRANDE | – | yes | yes |
| 520-465 | AT&T | TUCSON | – | – | yes |
| 520-466 | Lumen | CASAGRANDE | – | – | yes |
| 520-467 | Onvoy | TUCSON | 2019-12-19 | yes | yes |
| 520-468 | Onvoy | TUCSON | 2008-05-21 | yes | yes |
| 520-469 | Lumen | TUCSON | – | – | yes |
| 520-470 | T-Mobile | NOGALES | – | yes | yes |
| 520-471 | Verizon | TUCSON | – | – | yes |
| 520-472 | Lumen | CASAGRANDE | 2019-08-26 | yes | yes |
| 520-473 | T-Mobile | SIERRAVIST | 2020-11-23 | yes | yes |
| 520-474 | T-Mobile | TUCSON | 2012-11-16 | yes | yes |
| 520-475 | CSC WIRELESS, LLC | TUCSON | 2020-06-05 | yes | yes |
| 520-476 | NUSO, LLC | TUCSON | 2020-09-01 | yes | yes |
| 520-477 | Verizon | TUCSON | 2011-01-12 | yes | yes |
| 520-478 | AT&T | AJO | 2020-10-27 | yes | yes |
| 520-479 | T-Mobile | TUCSON | 2020-05-11 | yes | yes |
| 520-481 | T-Mobile | TUCSON | – | – | yes |
| 520-482 | AT&T | TUCSON | 2021-07-01 | yes | yes |
| 520-483 | Verizon | CASAGRANDE | – | yes | yes |
| 520-484 | NUSO, LLC | TUCSON | 2012-10-22 | yes | yes |
| 520-485 | Bandwidth | TUCSON | 2015-05-13 | yes | yes |
| 520-486 | AT&T | TUCSON | 2020-09-16 | yes | yes |
| 520-487 | Lumen | SAN MANUEL | – | yes | yes |
| 520-488 | Verizon | TUCSON | – | – | yes |
| 520-489 | Lumen | TUCSON | – | – | yes |
| 520-490 | Verizon | TUCSON | – | – | yes |
| 520-491 | T-Mobile | FLAGSTAFF | – | yes | yes |
| 520-492 | Comcast | TUCSON | 2020-10-06 | yes | yes |
| 520-493 | FIRSTDIGITAL TELECOM, LLC - UT | TUCSON | 2019-04-18 | yes | yes |
| 520-494 | Lumen | CASAGRANDE | – | yes | yes |
| 520-495 | Lumen | TUCSON | – | yes | yes |
| 520-496 | Verizon | TUCSON | 2020-10-07 | yes | yes |
| 520-497 | Bandwidth | TUCSON | 2020-10-07 | yes | yes |
| 520-498 | Lumen | TUCSON | – | – | yes |
| 520-499 | T-Mobile | TUCSON | 2013-04-19 | yes | yes |
| 520-500 | Onvoy | TUCSON | 2015-02-26 | yes | yes |
| 520-501 | Twilio | TUCSON | 2020-10-22 | yes | yes |
| 520-502 | Onvoy | SASABE | 2020-06-02 | yes | yes |
| 520-503 | Onvoy | WILLCOX | 2020-12-22 | yes | yes |
| 520-504 | T-Mobile | SIERRAVIST | 2021-04-02 | yes | yes |
| 520-505 | Allstream | TUCSON | 2009-07-20 | yes | yes |
| 520-506 | Onvoy | TOMBSTONE | 2020-12-23 | yes | yes |
| 520-507 | Verizon | WILLCOX | – | – | yes |
| 520-508 | Verizon | SIERRAVIST | – | – | yes |
| 520-509 | Lumen | CASAGRANDE | 2001-05-15 | yes | yes |
| 520-510 | AT&T | CASAGRANDE | – | yes | yes |
| 520-512 | Lumen | TUCSON | – | yes | yes |
| 520-513 | Lumen | TUCSON | – | yes | yes |
| 520-514 | Lumen | TUCSON | – | – | yes |
| 520-515 | Lumen | SIERRAVIST | – | – | yes |
| 520-516 | Lumen | TUCSON | – | – | yes |
| 520-517 | Verizon | SACATON | 2021-04-12 | yes | yes |
| 520-518 | AT&T | CASAGRANDE | – | yes | yes |
| 520-519 | Lumen | TUCSON | – | yes | yes |
| 520-520 | Onvoy | NOGALES | 2022-09-26 | yes | yes |
| 520-521 | HD CARRIER LLC | SAN MANUEL | 2020-10-26 | yes | yes |
| 520-522 | FRACTEL, LLC | CASABLANCA | 2020-06-02 | yes | yes |
| 520-523 | Onvoy | SIERRAVIST | 2020-05-07 | yes | yes |
| 520-524 | Onvoy | TUCSON | 2020-12-21 | yes | yes |
| 520-525 | Onvoy | BISBEE | 2020-05-07 | yes | yes |
| 520-526 | COMMIO, LLC | TUCSON | 2017-04-28 | yes | yes |
| 520-527 | Onvoy | BENSON | 2020-12-22 | yes | yes |
| 520-528 | Verizon | TUCSON | 2015-01-19 | yes | yes |
| 520-529 | Lumen | TUCSON | – | – | yes |
| 520-530 | Onvoy | TUCSON | 2020-10-02 | yes | yes |
| 520-531 | Lumen | TUCSON | – | – | yes |
| 520-532 | Onvoy | CASAGRANDE | 2020-12-23 | yes | yes |
| 520-533 | Lumen | SIERRAVIST | – | – | yes |
| 520-534 | T-Mobile | TUCSON | 2021-01-11 | yes | yes |
| 520-535 | T-Mobile | TUCSON | 2020-12-08 | yes | yes |
| 520-536 | Onvoy | DOUGLAS | 2020-12-22 | yes | yes |
| 520-537 | IP HORIZON LLC | TUCSON | 2021-03-04 | yes | yes |
| 520-538 | Lumen | SIERRAVIST | – | – | yes |
| 520-539 | Verizon | TUCSON | 2014-04-09 | yes | yes |
| 520-540 | Bandwidth | TUCSON | 2022-12-15 | yes | yes |
| 520-541 | Verizon | WILLCOX | 2021-07-07 | yes | yes |
| 520-542 | Lumen | TUCSON | 2021-08-04 | yes | yes |
| 520-543 | T-Mobile | TUCSON | 2021-05-14 | yes | yes |
| 520-544 | Lumen | TUCSON | – | – | yes |
| 520-545 | Lumen | TUCSON | – | – | yes |
| 520-546 | Lumen | TUCSON | – | – | yes |
| 520-547 | Lumen | TUCSON | – | – | yes |
| 520-548 | AT&T | TUCSON | 2001-07-19 | – | yes |
| 520-549 | Verizon | TUCSON | – | yes | yes |
| 520-550 | GILA RIVER TELECOMM, INC. | KOMATKE | – | – | yes |
| 520-551 | AT&T | TUCSON | 2001-11-19 | – | yes |
| 520-552 | Onvoy | BISBEE | – | yes | yes |
| 520-553 | T-Mobile | CASAGRANDE | 2021-07-19 | yes | yes |
| 520-554 | AT&T | TUCSON | 2021-08-09 | yes | yes |
| 520-556 | T-Mobile | SIERRAVIST | 2021-08-24 | yes | yes |
| 520-557 | COMMIO, LLC | CASAGRANDE | 2022-11-04 | yes | yes |
| 520-558 | VALLEY TEL COOP INC | PORTAL | – | – | yes |
| 520-559 | Verizon | SIERRAVIST | – | – | yes |
| 520-560 | AT&T | CASAGRANDE | – | – | yes |
| 520-561 | Verizon | TUCSON | – | yes | yes |
| 520-562 | GILA RIVER TELECOMM, INC. | SACATON | – | – | yes |
| 520-563 | IP HORIZON LLC | BENSON | 2021-09-03 | yes | yes |
| 520-564 | IP HORIZON LLC | DOUGLAS | 2021-09-03 | yes | yes |
| 520-565 | AT&T | TUCSON | 2021-08-09 | yes | yes |
| 520-566 | Lumen | TUCSON | – | – | yes |
| 520-567 | IP HORIZON LLC | HAYDEN | 2021-09-03 | yes | yes |
| 520-568 | Lumen | CASAGRANDE | – | – | yes |
| 520-569 | IP HORIZON LLC | SAN MANUEL | 2021-09-03 | yes | yes |
| 520-570 | Lumen | TUCSON | – | yes | yes |
| 520-571 | Lumen | TUCSON | – | yes | yes |
| 520-572 | Lumen | TUCSON | – | – | yes |
| 520-573 | Lumen | TUCSON | – | – | yes |
| 520-574 | Lumen | TUCSON | – | – | yes |
| 520-575 | Lumen | TUCSON | – | – | yes |
| 520-576 | Lumen | TUCSON | – | yes | yes |
| 520-577 | Lumen | TUCSON | – | – | yes |
| 520-578 | Lumen | TUCSON | – | – | yes |
| 520-579 | Lumen | TUCSON | – | – | yes |
| 520-580 | Charter | SUPERIOR | 2021-06-28 | yes | yes |
| 520-581 | IP HORIZON LLC | TOMBSTONE | 2021-09-03 | yes | yes |
| 520-582 | Lumen | CASAGRANDE | – | yes | yes |
| 520-583 | IP HORIZON LLC | WHITLOW | 2021-09-03 | yes | yes |
| 520-584 | Lumen | TUCSON | – | – | yes |
| 520-585 | T-Mobile | TUCSON | 2016-03-09 | yes | yes |
| 520-586 | Lumen | BENSON | – | – | yes |
| 520-587 | AT&T | PORTAL | 2021-09-24 | – | yes |
| 520-588 | FRACTEL, LLC | CASCABEL | 2020-09-24 | yes | yes |
| 520-589 | Lumen | TUCSON | 2015-07-29 | yes | yes |
| 520-590 | Verizon | BISBEE | 2021-11-10 | yes | yes |
| 520-591 | Verizon | TUCSON | – | – | yes |
| 520-592 | Telnyx | NOGALES | 2021-10-04 | yes | yes |
| 520-593 | Onvoy | HAYDEN | 2020-12-24 | yes | yes |
| 520-594 | WAVENATION, LLC | TUCSON | – | yes | yes |
| 520-595 | Lumen | BENSON | 2015-06-05 | yes | yes |
| 520-596 | T-Mobile | TUCSON | 2021-10-26 | yes | yes |
| 520-597 | Onvoy | SUPERIOR | 2016-03-22 | yes | yes |
| 520-598 | T-Mobile | CASAGRANDE | 2021-10-11 | yes | yes |
| 520-599 | AT&T | TUCSON | 2014-12-15 | yes | yes |
| 520-600 | Onvoy | TUCSON | 2017-10-10 | yes | yes |
| 520-601 | Verizon | SELLS | 2021-12-17 | yes | yes |
| 520-602 | Charter | TUCSON | 2023-08-17 | yes | yes |
| 520-603 | Verizon | TUCSON | – | – | yes |
| 520-604 | Verizon | NOGALES | – | yes | yes |
| 520-605 | Bandwidth | TUCSON | 2021-10-25 | yes | yes |
| 520-606 | T-Mobile | TUCSON | 2014-02-05 | yes | yes |
| 520-607 | AT&T | CASAGRANDE | 2021-12-17 | yes | yes |
| 520-608 | Onvoy | SAN MANUEL | 2022-01-25 | yes | yes |
| 520-609 | Verizon | TUCSON | – | yes | yes |
| 520-610 | Verizon | SACATON | – | yes | yes |
| 520-612 | Bandwidth | TUCSON | 2012-05-22 | yes | yes |
| 520-613 | AT&T | TUCSON | 2022-01-07 | yes | yes |
| 520-614 | Onvoy | TUCSON | 2022-02-24 | yes | yes |
| 520-615 | Lumen | TUCSON | – | – | yes |
| 520-616 | Lumen | TUCSON | – | yes | yes |
| 520-617 | Lumen | TUCSON | – | – | yes |
| 520-618 | Lumen | TUCSON | – | yes | yes |
| 520-619 | T-Mobile | NOGALES | 2001-05-15 | yes | yes |
| 520-620 | Lumen | TUCSON | – | – | yes |
| 520-621 | Lumen | TUCSON | – | – | yes |
| 520-622 | Lumen | TUCSON | – | – | yes |
| 520-623 | Lumen | TUCSON | – | – | yes |
| 520-624 | Lumen | TUCSON | – | – | yes |
| 520-625 | Lumen | TUCSON | – | – | yes |
| 520-626 | Lumen | TUCSON | – | – | yes |
| 520-627 | Verizon | TUCSON | 2022-01-18 | yes | yes |
| 520-628 | Lumen | TUCSON | – | yes | yes |
| 520-629 | Lumen | TUCSON | – | – | yes |
| 520-630 | Onvoy | WILLCOX | 2021-12-02 | yes | yes |
| 520-631 | T-Mobile | TUCSON | – | yes | yes |
| 520-632 | Verizon | CASAGRANDE | 2021-12-15 | yes | yes |
| 520-633 | Verizon | TUCSON | 2022-01-08 | yes | yes |
| 520-634 | T-Mobile | CASAGRANDE | 2022-03-10 | yes | yes |
| 520-635 | T-Mobile | CASAGRANDE | 2015-04-07 | yes | yes |
| 520-636 | Peerless | SAN MANUEL | 2015-09-30 | yes | yes |
| 520-637 | T-Mobile | CASAGRANDE | 2020-12-23 | yes | yes |
| 520-638 | Lumen | TUCSON | 2008-04-28 | yes | yes |
| 520-639 | Lumen | TUCSON | 2015-04-17 | yes | yes |
| 520-640 | Lumen | TUCSON | 2022-04-15 | yes | yes |
| 520-641 | TON80 COMMUNICATIONS, LLC | BENSON | 2022-02-18 | yes | yes |
| 520-642 | VALLEY TEL COOP INC | ELFRIDA | – | – | yes |
| 520-643 | Verizon | WILLCOX | 2022-03-28 | yes | yes |
| 520-644 | FRACTEL, LLC | KOMATKE | 2020-09-24 | yes | yes |
| 520-645 | Verizon | DOUGLAS | 2013-09-30 | yes | yes |
| 520-646 | TON80 COMMUNICATIONS, LLC | NOGALES | 2022-02-18 | yes | yes |
| 520-647 | Lumen | TUCSON | – | yes | yes |
| 520-648 | Lumen | TUCSON | – | – | yes |
| 520-649 | Verizon | TUCSON | 2022-08-10 | yes | yes |
| 520-650 | Onvoy | WHITLOW | 2020-10-29 | yes | yes |
| 520-651 | Verizon | TUCSON | 2022-07-14 | yes | yes |
| 520-652 | Lumen | WHITLOW | 2022-03-01 | yes | yes |
| 520-653 | Bandwidth | TUCSON | 2022-07-20 | yes | yes |
| 520-654 | COMMIO, LLC | SIERRAVIST | 2022-08-25 | yes | yes |
| 520-655 | FRACTEL, LLC | SUPERIOR | 2020-06-02 | yes | yes |
| 520-656 | Verizon | WILLCOX | 2022-10-27 | yes | yes |
| 520-657 | Bandwidth | HAYDEN | 2022-10-04 | yes | yes |
| 520-658 | T-Mobile | TUCSON | 2014-10-24 | yes | yes |
| 520-659 | NUSO, LLC | NOGALES | 2022-09-15 | yes | yes |
| 520-660 | T-Mobile | CASAGRANDE | 2022-09-20 | yes | yes |
| 520-661 | T-Mobile | TUCSON | – | yes | yes |
| 520-662 | Lumen | TUCSON | 2004-06-11 | yes | yes |
| 520-663 | Lumen | TUCSON | – | – | yes |
| 520-664 | Lumen | TUCSON | – | yes | yes |
| 520-665 | Lumen | TUCSON | – | yes | yes |
| 520-666 | Onvoy | CASAGRANDE | 2017-09-12 | yes | yes |
| 520-667 | NUSO, LLC | TUCSON | 2023-02-13 | yes | yes |
| 520-668 | Verizon | TUCSON | 2002-05-08 | yes | yes |
| 520-669 | Verizon | SIERRAVIST | 2023-03-09 | yes | yes |
| 520-670 | Lumen | TUCSON | – | – | yes |
| 520-671 | Verizon | SIERRAVIST | 2023-03-09 | yes | yes |
| 520-672 | Verizon | SIERRAVIST | 2023-03-09 | yes | yes |
| 520-673 | Verizon | SIERRAVIST | 2023-03-09 | yes | yes |
| 520-674 | Verizon | SIERRAVIST | 2023-03-09 | yes | yes |
| 520-675 | Dish | TUCSON | 2023-04-14 | yes | yes |
| 520-676 | Verizon | WILLCOX | 2025-06-06 | yes | yes |
| 520-677 | Dish | CASAGRANDE | 2023-04-18 | yes | yes |
| 520-678 | Verizon | SIERRAVIST | – | – | yes |
| 520-679 | Verizon | TOMBSTONE | 2023-06-08 | yes | yes |
| 520-680 | Onvoy | BISBEE | 2023-06-22 | yes | yes |
| 520-681 | Lumen | NOGALES | 2023-06-26 | yes | yes |
| 520-682 | Lumen | TUCSON | – | – | yes |
| 520-683 | Onvoy | CASAGRANDE | 2023-08-11 | yes | yes |
| 520-684 | Verizon | SIERRAVIST | 2023-08-31 | yes | yes |
| 520-685 | Comcast | SIERRAVIST | – | yes | yes |
| 520-686 | Verizon | BENSON | 2004-06-08 | yes | yes |
| 520-687 | Verizon | SIERRAVIST | 2023-08-31 | yes | yes |
| 520-688 | FRACTEL, LLC | CASAGRANDE | 2021-09-15 | yes | yes |
| 520-689 | Lumen | SUPERIOR | – | yes | yes |
| 520-690 | Lumen | TUCSON | – | – | yes |
| 520-691 | Verizon | SIERRAVIST | 2023-08-31 | yes | yes |
| 520-692 | Verizon | SIERRAVIST | 2023-08-31 | yes | yes |
| 520-693 | Verizon | SIERRAVIST | 2023-08-31 | yes | yes |
| 520-694 | Lumen | TUCSON | – | – | yes |
| 520-695 | Lumen | TUCSON | – | – | yes |
| 520-696 | Lumen | TUCSON | – | – | yes |
| 520-697 | Verizon | TUCSON | 2023-09-06 | yes | yes |
| 520-698 | Verizon | WILLCOX | 2023-10-18 | yes | yes |
| 520-699 | FRACTEL, LLC | SIERRAVIST | 2021-10-15 | yes | yes |
| 520-701 | T-Mobile | CASAGRANDE | 2023-11-09 | yes | yes |
| 520-702 | Onvoy | DOUGLAS | 2022-01-14 | yes | yes |
| 520-703 | CALLWORKS CORPORATION | TUCSON | 2023-12-08 | yes | yes |
| 520-704 | AT&T | TUCSON | 2010-02-09 | yes | yes |
| 520-705 | Verizon | CASAGRANDE | – | – | yes |
| 520-706 | Verizon | SIERRAVIST | 2024-01-08 | yes | yes |
| 520-707 | Verizon | SIERRAVIST | 2024-01-08 | yes | yes |
| 520-708 | Verizon | SIERRAVIST | 2024-01-08 | yes | yes |
| 520-709 | Verizon | CASAGRANDE | – | yes | yes |
| 520-710 | Charter | TUCSON | 2022-08-10 | yes | yes |
| 520-712 | Lumen | TUCSON | – | – | yes |
| 520-713 | Verizon | SIERRAVIST | 2024-01-08 | yes | yes |
| 520-714 | Verizon | SIERRAVIST | 2024-01-08 | yes | yes |
| 520-715 | Verizon | SIERRAVIST | 2024-01-08 | yes | yes |
| 520-716 | Verizon | SIERRAVIST | 2024-01-08 | yes | yes |
| 520-717 | Verizon | SIERRAVIST | 2024-01-08 | yes | yes |
| 520-718 | Verizon | SIERRAVIST | 2024-01-08 | yes | yes |
| 520-719 | Bandwidth | TUCSON | 2015-07-23 | yes | yes |
| 520-720 | Lumen | BENSON | – | yes | yes |
| 520-721 | Lumen | TUCSON | – | – | yes |
| 520-722 | Lumen | TUCSON | – | – | yes |
| 520-723 | Lumen | CASAGRANDE | – | – | yes |
| 520-724 | Lumen | TUCSON | 2011-02-02 | yes | yes |
| 520-725 | Verizon | SIERRAVIST | 2024-01-08 | yes | yes |
| 520-727 | AT&T | DOUGLAS | 2005-08-24 | yes | yes |
| 520-728 | T-Mobile | CASAGRANDE | 2024-02-16 | yes | yes |
| 520-729 | Verizon | TUCSON | 2014-10-17 | yes | yes |
| 520-730 | Verizon | TUCSON | – | yes | yes |
| 520-731 | Lumen | TUCSON | – | – | yes |
| 520-732 | Verizon | SIERRAVIST | 2001-05-15 | yes | yes |
| 520-733 | Lumen | TUCSON | – | – | yes |
| 520-734 | Verizon | TUCSON | 2024-03-01 | yes | yes |
| 520-735 | AT&T | SIERRAVIST | 2024-03-28 | yes | yes |
| 520-736 | AT&T | CASAGRANDE | 2024-06-13 | yes | yes |
| 520-737 | ALLO COMMUNICATIONS LLC | SIERRAVIST | 2024-06-17 | yes | yes |
| 520-738 | Verizon | TUCSON | 2024-10-22 | yes | yes |
| 520-739 | Charter | TUCSON | 2024-11-14 | yes | yes |
| 520-740 | Lumen | TUCSON | – | – | yes |
| 520-741 | Lumen | TUCSON | – | – | yes |
| 520-742 | Lumen | TUCSON | – | – | yes |
| 520-743 | Lumen | TUCSON | – | yes | yes |
| 520-744 | Lumen | TUCSON | – | – | yes |
| 520-745 | Lumen | TUCSON | – | – | yes |
| 520-746 | Lumen | TUCSON | – | – | yes |
| 520-747 | Lumen | TUCSON | – | – | yes |
| 520-748 | Lumen | TUCSON | – | – | yes |
| 520-749 | Lumen | TUCSON | – | – | yes |
| 520-750 | Lumen | TUCSON | – | yes | yes |
| 520-751 | Lumen | TUCSON | – | – | yes |
| 520-752 | Verizon | CASAGRANDE | 2025-01-08 | yes | yes |
| 520-753 | Verizon | TUCSON | 2025-01-31 | yes | yes |
| 520-754 | Verizon | SACATON | 2025-02-14 | yes | yes |
| 520-755 | FRACTEL, LLC | LONE BUTTE | 2020-09-24 | yes | yes |
| 520-756 | AT&T | TUCSON | 2025-03-18 | yes | yes |
| 520-757 | T-Mobile | CASAGRANDE | 2025-03-25 | yes | yes |
| 520-758 | FRACTEL, LLC | BLACKWATER | 2020-10-19 | yes | yes |
| 520-759 | Verizon | CASAGRANDE | 2018-09-10 | yes | yes |
| 520-760 | Lumen | TUCSON | – | – | yes |
| 520-761 | Lumen | NOGALES | – | – | yes |
| 520-762 | Lumen | TUCSON | – | yes | yes |
| 520-763 | T-Mobile | CASAGRANDE | 2025-07-11 | yes | yes |
| 520-764 | T-Mobile | CASAGRANDE | 2025-10-28 | yes | yes |
| 520-765 | T-Mobile | CASAGRANDE | 2026-01-09 | yes | yes |
| 520-766 | VALLEY CONNECTIONS, L.L.C. - AZ | WILLCOX | 2005-12-21 | – | yes |
| 520-767 | AT&T | CASAGRANDE | 2026-04-03 | yes | yes |
| 520-768 | IP HORIZON LLC | DOUGLAS | 2026-10-30 | yes | no |
| 520-769 | IP HORIZON LLC | HAYDEN | 2026-10-30 | yes | no |
| 520-770 | Lumen | TUCSON | – | yes | yes |
| 520-771 | Vonage | TUCSON | 2017-12-20 | yes | yes |
| 520-772 | TON80 COMMUNICATIONS, LLC | SUPERIOR | 2022-01-14 | yes | yes |
| 520-773 | IP HORIZON LLC | NOGALES | 2026-10-30 | yes | no |
| 520-774 | IP HORIZON LLC | SAN MANUEL | 2026-10-30 | yes | no |
| 520-775 | Bandwidth | TUCSON | 2014-02-28 | yes | yes |
| 520-777 | Lumen | TUCSON | 2004-10-27 | yes | yes |
| 520-779 | Bandwidth | WILLCOX | 2018-09-10 | yes | yes |
| 520-780 | Verizon | TUCSON | – | yes | yes |
| 520-783 | T-Mobile | TUCSON | 2019-02-05 | yes | yes |
| 520-784 | Lumen | TUCSON | – | yes | yes |
| 520-785 | ALLO COMMUNICATIONS LLC | TUCSON | 2025-10-22 | yes | yes |
| 520-788 | T-Mobile | CASAGRANDE | 2014-09-22 | yes | yes |
| 520-789 | T-Mobile | TUCSON | 2012-02-24 | yes | yes |
| 520-790 | Lumen | TUCSON | – | – | yes |
| 520-791 | Lumen | TUCSON | – | – | yes |
| 520-792 | Lumen | TUCSON | – | – | yes |
| 520-793 | Lumen | TUCSON | – | – | yes |
| 520-794 | Lumen | TUCSON | – | – | yes |
| 520-795 | Lumen | TUCSON | – | – | yes |
| 520-796 | GILA RIVER TELECOMM, INC. | LONE BUTTE | – | – | yes |
| 520-797 | Lumen | TUCSON | – | – | yes |
| 520-798 | Lumen | TUCSON | – | – | yes |
| 520-799 | Lumen | TUCSON | – | – | yes |
| 520-800 | Onvoy | TUCSON | 2015-01-28 | yes | yes |
| 520-801 | WIDE VOICE, LLC - AZ | TUCSON | 2025-04-18 | yes | yes |
| 520-802 | LEAP TELECOM, LLC | TUCSON | 2025-10-01 | yes | yes |
| 520-803 | Lumen | SIERRAVIST | – | – | yes |
| 520-805 | Lumen | DOUGLAS | – | yes | yes |
| 520-806 | Lumen | TUCSON | – | yes | yes |
| 520-807 | Lumen | TUCSON | – | – | yes |
| 520-808 | AT&T | TUCSON | 2001-08-17 | – | yes |
| 520-809 | INTRADO COMMUNICATIONS, LLC | TUCSON | 2014-12-23 | yes | yes |
| 520-812 | Bandwidth | TUCSON | 2011-04-19 | yes | yes |
| 520-815 | Bandwidth | TUCSON | 2015-03-10 | yes | yes |
| 520-818 | Lumen | TUCSON | – | yes | yes |
| 520-820 | Verizon | TUCSON | – | yes | yes |
| 520-822 | Lumen | TUCSON | – | yes | yes |
| 520-823 | ARIZONA TEL. CO. | SASABE | – | yes | yes |
| 520-824 | VALLEY TEL COOP INC | SUNIZONA | – | – | yes |
| 520-825 | Lumen | TUCSON | – | – | yes |
| 520-826 | VALLEY TEL COOP INC | PEARCE | – | – | yes |
| 520-827 | Verizon | SUPERIOR | – | yes | yes |
| 520-829 | Lumen | TUCSON | 2001-08-17 | yes | yes |
| 520-831 | T-Mobile | PRESCOTT | – | yes | yes |
| 520-833 | Verizon | TUCSON | – | yes | yes |
| 520-834 | AT&T | TUCSON | 2001-10-17 | yes | yes |
| 520-836 | Lumen | CASAGRANDE | – | – | yes |
| 520-837 | AT&T | TUCSON | – | yes | yes |
| 520-838 | Lumen | TUCSON | 2001-01-26 | yes | yes |
| 520-839 | T-Mobile | NOGALES | – | yes | yes |
| 520-840 | Verizon | CASAGRANDE | – | yes | yes |
| 520-841 | AT&T | NOGALES | – | yes | yes |
| 520-842 | Onvoy | NOGALES | – | – | yes |
| 520-843 | Onvoy | SIERRAVIST | – | – | yes |
| 520-844 | Onvoy | TUCSON | – | – | yes |
| 520-845 | VALLEY TEL COOP INC | SAN SIMON | – | – | yes |
| 520-847 | VALLEY TEL COOP INC | BOWIE | – | – | yes |
| 520-848 | T-Mobile | TUCSON | 2015-01-19 | yes | yes |
| 520-849 | Verizon | TUCSON | 2017-06-15 | yes | yes |
| 520-850 | Verizon | TUCSON | – | – | yes |
| 520-851 | AT&T | SIERRAVIST | 2024-10-22 | yes | yes |
| 520-852 | AT&T | SIERRAVIST | 2024-10-22 | yes | yes |
| 520-853 | AT&T | SIERRAVIST | 2024-10-22 | yes | yes |
| 520-854 | AT&T | SIERRAVIST | 2024-10-22 | yes | yes |
| 520-855 | AT&T | SIERRAVIST | 2024-10-22 | yes | yes |
| 520-858 | Lumen | CASAGRANDE | 2007-11-07 | yes | yes |
| 520-860 | Verizon | NOGALES | – | yes | yes |
| 520-861 | T-Mobile | TUCSON | – | yes | yes |
| 520-866 | Lumen | CASAGRANDE | 2001-08-17 | yes | yes |
| 520-867 | AT&T | TUCSON | 2001-11-19 | yes | yes |
| 520-868 | Lumen | CASAGRANDE | – | – | yes |
| 520-869 | T-Mobile | TUCSON | – | yes | yes |
| 520-870 | T-Mobile | TUCSON | – | yes | yes |
| 520-872 | Lumen | TUCSON | – | – | yes |
| 520-873 | Lumen | TUCSON | – | yes | yes |
| 520-874 | Lumen | TUCSON | – | yes | yes |
| 520-876 | Lumen | CASAGRANDE | – | – | yes |
| 520-877 | Lumen | TUCSON | – | yes | yes |
| 520-878 | Lumen | TUCSON | – | yes | yes |
| 520-879 | Lumen | TUCSON | – | – | yes |
| 520-881 | Lumen | TUCSON | – | – | yes |
| 520-882 | Lumen | TUCSON | – | – | yes |
| 520-883 | Lumen | TUCSON | – | – | yes |
| 520-884 | Lumen | TUCSON | – | yes | yes |
| 520-885 | Lumen | TUCSON | – | – | yes |
| 520-886 | Lumen | TUCSON | – | – | yes |
| 520-887 | Lumen | TUCSON | – | – | yes |
| 520-888 | Lumen | TUCSON | – | – | yes |
| 520-889 | Lumen | TUCSON | – | – | yes |
| 520-890 | 8x8 | TUCSON | 2026-10-16 | yes | no |
| 520-891 | T-Mobile | TUCSON | – | – | yes |
| 520-895 | Lumen | SIERRAVIST | – | yes | yes |
| 520-896 | Lumen | SAN MANUEL | – | yes | yes |
| 520-898 | MIDVALE TELEPHONE EXCHANGE, INC. | SILVERBELL | 2002-04-02 | – | yes |
| 520-899 | FRACTEL, LLC | MARCOPAVLG | 2020-09-24 | yes | yes |
| 520-900 | Onvoy | TUCSON | 2015-08-13 | yes | yes |
| 520-901 | Lumen | TUCSON | – | yes | yes |
| 520-903 | Lumen | TUCSON | – | yes | yes |
| 520-904 | Verizon | TUCSON | – | yes | yes |
| 520-906 | AT&T | TUCSON | – | – | yes |
| 520-907 | AT&T | TUCSON | – | – | yes |
| 520-908 | Lumen | TUCSON | – | yes | yes |
| 520-909 | Verizon | TUCSON | – | – | yes |
| 520-910 | Onvoy | TUCSON | 2021-02-01 | yes | yes |
| 520-912 | AT&T | TUCSON | 2013-10-24 | yes | yes |
| 520-917 | Verizon | TUCSON | – | – | yes |
| 520-918 | Verizon | TUCSON | – | – | yes |
| 520-921 | T-Mobile | SEDONA | – | yes | yes |
| 520-922 | AHOI LLC | TUCSON | 2026-03-09 | yes | yes |
| 520-924 | Allstream | NOGALES | – | yes | yes |
| 520-929 | TON80 COMMUNICATIONS, LLC | WILLCOX | 2022-02-18 | yes | yes |
| 520-934 | TON80 COMMUNICATIONS, LLC | TUCSON | 2021-04-06 | yes | yes |
| 520-940 | T-Mobile | TUCSON | – | yes | yes |
| 520-941 | AT&T | SIERRAVIST | 2023-07-27 | yes | yes |
| 520-942 | AT&T | SIERRAVIST | 2023-07-27 | yes | yes |
| 520-943 | AT&T | SIERRAVIST | 2023-07-27 | yes | yes |
| 520-944 | AT&T | SIERRAVIST | 2023-07-27 | yes | yes |
| 520-945 | AT&T | SIERRAVIST | 2023-07-27 | yes | yes |
| 520-949 | TON80 COMMUNICATIONS, LLC | SANTA ROSA | 2022-01-14 | yes | yes |
| 520-954 | Verizon | TUCSON | – | – | yes |
| 520-955 | Verizon | TUCSON | – | yes | yes |
| 520-965 | T-Mobile | TUCSON | 2015-01-02 | yes | yes |
| 520-966 | FRACTEL, LLC | SILVERBELL | 2020-10-19 | yes | yes |
| 520-971 | T-Mobile | TUCSON | – | yes | yes |
| 520-975 | Verizon | TUCSON | – | – | yes |
| 520-977 | T-Mobile | TUCSON | – | yes | yes |
| 520-979 | T-Mobile | TUCSON | – | yes | yes |
| 520-980 | T-Mobile | NOGALES | – | yes | yes |
| 520-981 | T-Mobile | TUCSON | – | yes | yes |
| 520-982 | T-Mobile | TUCSON | – | yes | yes |
| 520-987 | Verizon | NOGALES | – | yes | yes |
| 520-988 | Verizon | NOGALES | – | yes | yes |
| 520-989 | Allstream | TUCSON | – | yes | yes |
| 520-990 | T-Mobile | TUCSON | – | yes | yes |
| 520-991 | T-Mobile | TUCSON | – | yes | yes |
| 520-993 | Verizon | SELLS | – | yes | yes |
| 520-994 | TON80 COMMUNICATIONS, LLC | SASABE | 2022-02-18 | yes | yes |
| 520-999 | Onvoy | TUCSON | 2012-11-05 | yes | yes |
Frequently asked
How many prefixes does area code 520 have?
699 NXX blocks are assigned of 786 possible. Each block is 10,000 consecutive numbers, so the code currently covers about 6,990 thousand-number ranges across 37 rate centers.
What do the first three digits after 520 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 520 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 520 table?
That the block is in thousands-block pooling: carriers draw 1,000-number lots from it instead of taking all 10,000. 492 of 520'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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