Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records
Area code 475 prefixes
292 of the 786 possible NXX blocks are assigned in area code 475 (37.2% of capacity), spread across 32 rate centers and 31 holders. The largest holders are ONVOY, LLC - CT (65 blocks, 22.3%), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT (47 blocks, 16.1%), OMNIPOINT COMMUNICATIONS, INC. - CT (40 blocks, 13.7%). Grouped by brand, Onvoy accounts for 65 blocks; brand-attributable holders cover 84% 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 2009-08-07 to 2026-10-12, with 34 blocks handed out in 2015 alone. 292 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. 6 assigned blocks (401, 404, 406, 475, 509, 997) are not yet in service: assigned to a carrier but not open for calls, so a caller ID from one is spoofed. 225 were growth assignments – additional blocks to a carrier that had already filled its earlier ones.
292 assigned blocks of 786
32 rate centers
31 holders of record
100% in thousands-block pooling
Largest holders in 475
| Holder of record, as NANPA names it | Brand | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC - CT | Onvoy | 65 | 22.3% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | Verizon | 47 | 16.1% |
| OMNIPOINT COMMUNICATIONS, INC. - CT | T-Mobile | 40 | 13.7% |
| BANDWIDTH.COM CLEC, LLC - CT | Bandwidth | 18 | 6.2% |
| NEW CINGULAR WIRELESS PCS, LLC - DC | AT&T | 18 | 6.2% |
| TON80 COMMUNICATIONS, LLC | – | 17 | 5.8% |
| PEERLESS NETWORK OF CONNECTICUT, LLC - CT | Peerless | 15 | 5.1% |
| FRACTEL, LLC | – | 12 | 4.1% |
| METROPCS, INC. | T-Mobile | 5 | 1.7% |
| SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | AT&T | 5 | 1.7% |
| CABLEVISION LIGHTPATH, INC. - CT | Altice | 5 | 1.7% |
| BARR TEL USA, INC. - CT | – | 5 | 1.7% |
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.
NEW HAVEN 43STAMFORD 27BRIDGEPORT 25NORWALK 22ANSONIDRBY 19DANBURY 18WATERBURY 18HUNTINGTON 9GREENWICH 8TRUMBULL 7MERIDEN 7WALLINGFD 6MILFORD 6FAIRFIELD 6NEWTOWN 6NAUGATUCK 5BRANFORD 5CHESHIRE 5DARIEN 5WOODBURY 4OLDGRNWICH 4BYRAM 4SEYMOUR 4WESTPORT 4NEW CANAAN 4RIDGEFIELD 3WOLCOTT 3REDDING 3GUILFORD 3WILTON 3GEORGETOWN 3MADISON 3
All 292 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 |
|---|---|---|---|---|---|
| 475-200 | Peerless | HUNTINGTON | 2012-06-29 | yes | yes |
| 475-201 | T-Mobile | NEW HAVEN | 2010-02-17 | yes | yes |
| 475-202 | T-Mobile | NEW HAVEN | 2011-04-19 | yes | yes |
| 475-203 | Onvoy | WALLINGFD | 2023-06-14 | yes | yes |
| 475-204 | Verizon | DANBURY | 2012-12-20 | yes | yes |
| 475-205 | Lumen | STAMFORD | 2012-08-23 | yes | yes |
| 475-206 | T-Mobile | DANBURY | 2015-02-23 | yes | yes |
| 475-207 | Charter | WOODBURY | 2016-02-18 | yes | yes |
| 475-208 | Lumen | NORWALK | 2014-12-08 | yes | yes |
| 475-209 | AT&T | NEW HAVEN | 2014-07-21 | yes | yes |
| 475-210 | Lumen | BRIDGEPORT | 2016-03-30 | yes | yes |
| 475-212 | Peerless | NAUGATUCK | 2012-11-13 | yes | yes |
| 475-213 | Verizon | STAMFORD | 2015-05-12 | yes | yes |
| 475-214 | Verizon | STAMFORD | 2016-04-25 | yes | yes |
| 475-215 | Lumen | RIDGEFIELD | 2014-06-26 | yes | yes |
| 475-216 | T-Mobile | ANSONIDRBY | 2018-12-24 | yes | yes |
| 475-217 | Verizon | STAMFORD | 2016-07-01 | yes | yes |
| 475-218 | Verizon | DANBURY | 2015-08-11 | yes | yes |
| 475-219 | Bandwidth | WOLCOTT | 2015-04-16 | yes | yes |
| 475-220 | Windstream | NEW HAVEN | 2015-09-03 | yes | yes |
| 475-221 | Bandwidth | BRANFORD | 2014-08-15 | yes | yes |
| 475-222 | Peerless | WATERBURY | 2012-11-20 | yes | yes |
| 475-223 | T-Mobile | ANSONIDRBY | 2014-05-23 | yes | yes |
| 475-224 | Verizon | NEW HAVEN | 2015-11-17 | yes | yes |
| 475-225 | Verizon | BRIDGEPORT | 2015-08-11 | yes | yes |
| 475-226 | Verizon | STAMFORD | 2015-11-25 | yes | yes |
| 475-227 | AT&T | NEW HAVEN | 2011-06-13 | yes | yes |
| 475-228 | Verizon | ANSONIDRBY | 2016-01-28 | yes | yes |
| 475-229 | Verizon | STAMFORD | 2016-07-01 | yes | yes |
| 475-230 | AT&T | NEW HAVEN | 2016-03-21 | yes | yes |
| 475-231 | Charter | TRUMBULL | 2016-08-01 | yes | yes |
| 475-232 | Lumen | STAMFORD | 2016-07-25 | yes | yes |
| 475-233 | AT&T | WATERBURY | 2016-11-08 | yes | yes |
| 475-234 | Telnyx | NEW HAVEN | 2016-12-05 | yes | yes |
| 475-235 | AT&T | WATERBURY | 2011-07-05 | yes | yes |
| 475-236 | T-Mobile | BRIDGEPORT | 2017-09-01 | yes | yes |
| 475-237 | Verizon | DANBURY | 2017-12-27 | yes | yes |
| 475-238 | Verizon | NEW HAVEN | 2010-05-21 | yes | yes |
| 475-239 | Peerless | TRUMBULL | 2012-10-02 | yes | yes |
| 475-240 | AT&T | GREENWICH | 2015-03-11 | yes | yes |
| 475-241 | T-Mobile | NEW HAVEN | 2018-07-11 | yes | yes |
| 475-242 | Peerless | REDDING | 2017-06-29 | yes | yes |
| 475-243 | Peerless | ANSONIDRBY | 2013-02-08 | yes | yes |
| 475-244 | Onvoy | CHESHIRE | 2018-02-21 | yes | yes |
| 475-245 | Verizon | NORWALK | 2016-02-08 | yes | yes |
| 475-246 | AT&T | NEW HAVEN | 2014-07-22 | yes | yes |
| 475-247 | AT&T | NEW HAVEN | 2014-07-22 | yes | yes |
| 475-248 | AT&T | BRIDGEPORT | 2014-07-22 | yes | yes |
| 475-249 | AT&T | OLDGRNWICH | 2014-07-22 | yes | yes |
| 475-250 | Verizon | NORWALK | 2018-07-23 | yes | yes |
| 475-251 | AT&T | ANSONIDRBY | 2018-09-05 | yes | yes |
| 475-252 | Altice | BYRAM | 2018-09-20 | yes | yes |
| 475-253 | Peerless | WALLINGFD | 2018-10-24 | yes | yes |
| 475-254 | Verizon | NEW HAVEN | 2018-10-24 | yes | yes |
| 475-255 | AT&T | MERIDEN | 2018-10-05 | yes | yes |
| 475-256 | T-Mobile | DANBURY | 2018-12-24 | yes | yes |
| 475-257 | CSC WIRELESS, LLC | NORWALK | 2019-03-28 | yes | yes |
| 475-258 | T-Mobile | NORWALK | 2019-09-12 | yes | yes |
| 475-259 | T-Mobile | DARIEN | 2017-09-25 | yes | yes |
| 475-260 | Charter | HUNTINGTON | 2021-02-16 | yes | yes |
| 475-261 | Verizon | NEW HAVEN | 2019-10-25 | yes | yes |
| 475-262 | Bandwidth | HUNTINGTON | 2019-05-23 | yes | yes |
| 475-263 | Peerless | WATERBURY | 2019-10-01 | yes | yes |
| 475-264 | Onvoy | DARIEN | – | yes | yes |
| 475-265 | Bandwidth | TRUMBULL | 2020-02-05 | yes | yes |
| 475-266 | AT&T | NORWALK | 2015-06-10 | yes | yes |
| 475-267 | AT&T | NEW HAVEN | 2020-03-27 | yes | yes |
| 475-268 | T-Mobile | STAMFORD | 2020-02-13 | yes | yes |
| 475-269 | Onvoy | HUNTINGTON | 2015-05-21 | yes | yes |
| 475-270 | Onvoy | WALLINGFD | 2020-05-28 | yes | yes |
| 475-271 | Onvoy | MILFORD | 2020-06-12 | yes | yes |
| 475-272 | Altice | FAIRFIELD | 2020-06-03 | yes | yes |
| 475-273 | Bandwidth | BRIDGEPORT | 2020-06-22 | yes | yes |
| 475-274 | Bandwidth | GUILFORD | 2020-07-15 | yes | yes |
| 475-275 | Onvoy | BYRAM | 2016-02-22 | yes | yes |
| 475-276 | T-Mobile | STAMFORD | 2021-07-02 | yes | yes |
| 475-277 | Lumen | WILTON | 2014-06-16 | yes | yes |
| 475-278 | Altice | GREENWICH | 2021-02-28 | yes | yes |
| 475-279 | Verizon | DANBURY | 2015-11-17 | yes | yes |
| 475-280 | T-Mobile | ANSONIDRBY | 2021-03-26 | yes | yes |
| 475-281 | T-Mobile | ANSONIDRBY | 2020-12-07 | yes | yes |
| 475-282 | Bandwidth | BRIDGEPORT | 2011-08-29 | yes | yes |
| 475-283 | Verizon | NORWALK | 2016-01-05 | yes | yes |
| 475-284 | NUSO, LLC | BRIDGEPORT | 2020-09-18 | yes | yes |
| 475-285 | Bandwidth | NAUGATUCK | 2020-07-15 | yes | yes |
| 475-286 | Telnyx | BRANFORD | 2021-06-23 | yes | yes |
| 475-287 | T-Mobile | NEW HAVEN | 2021-07-16 | yes | yes |
| 475-288 | Lumen | NORWALK | 2014-10-03 | yes | yes |
| 475-289 | Verizon | DANBURY | 2014-05-22 | yes | yes |
| 475-290 | Bandwidth | DANBURY | 2021-08-31 | yes | yes |
| 475-291 | Verizon | NORWALK | 2021-09-27 | yes | yes |
| 475-292 | AT&T | STAMFORD | 2015-10-08 | yes | yes |
| 475-293 | Onvoy | WALLINGFD | 2021-06-24 | yes | yes |
| 475-294 | Onvoy | MILFORD | 2021-07-21 | yes | yes |
| 475-295 | AT&T | WATERBURY | 2021-04-27 | yes | yes |
| 475-296 | T-Mobile | DANBURY | 2021-09-27 | yes | yes |
| 475-297 | Bandwidth | NEWTOWN | 2021-09-27 | yes | yes |
| 475-298 | Verizon | BRIDGEPORT | 2011-09-16 | yes | yes |
| 475-299 | Verizon | STAMFORD | 2015-01-20 | yes | yes |
| 475-300 | Vonage | NEW HAVEN | 2016-06-03 | yes | yes |
| 475-301 | T-Mobile | NEW HAVEN | 2021-11-18 | yes | yes |
| 475-302 | Onvoy | BRIDGEPORT | 2021-10-05 | yes | yes |
| 475-303 | NUSO, LLC | GREENWICH | 2020-09-03 | yes | yes |
| 475-304 | Onvoy | HUNTINGTON | 2021-10-05 | yes | yes |
| 475-305 | T-Mobile | WATERBURY | 2021-08-12 | yes | yes |
| 475-306 | Verizon | NEW HAVEN | 2021-11-05 | yes | yes |
| 475-307 | T-Mobile | MERIDEN | 2021-11-18 | yes | yes |
| 475-308 | T-Mobile | NEW HAVEN | 2021-10-05 | yes | yes |
| 475-309 | T-Mobile | ANSONIDRBY | 2021-09-09 | yes | yes |
| 475-310 | Bandwidth | WALLINGFD | 2021-11-18 | yes | yes |
| 475-312 | T-Mobile | BRIDGEPORT | 2020-10-30 | yes | yes |
| 475-313 | T-Mobile | WATERBURY | 2015-09-09 | yes | yes |
| 475-314 | HD CARRIER LLC | HUNTINGTON | 2022-08-12 | yes | yes |
| 475-315 | Bandwidth | CHESHIRE | 2021-09-29 | yes | yes |
| 475-316 | T-Mobile | WATERBURY | 2022-01-14 | yes | yes |
| 475-317 | T-Mobile | NEW HAVEN | 2023-01-06 | yes | yes |
| 475-318 | Verizon | NEW HAVEN | 2023-02-14 | yes | yes |
| 475-319 | Verizon | BRIDGEPORT | 2016-09-29 | yes | yes |
| 475-320 | T-Mobile | ANSONIDRBY | 2021-12-03 | yes | yes |
| 475-321 | Verizon | NEW HAVEN | 2022-09-13 | yes | yes |
| 475-322 | Verizon | NORWALK | 2016-04-25 | yes | yes |
| 475-323 | T-Mobile | NEWTOWN | 2015-07-29 | yes | yes |
| 475-324 | Onvoy | TRUMBULL | 2023-06-23 | yes | yes |
| 475-325 | Bandwidth | GEORGETOWN | 2014-12-01 | yes | yes |
| 475-326 | T-Mobile | WATERBURY | 2023-06-23 | yes | yes |
| 475-327 | TON80 COMMUNICATIONS, LLC | MILFORD | 2022-01-13 | yes | yes |
| 475-328 | Verizon | DARIEN | 2014-04-30 | yes | yes |
| 475-329 | Bandwidth | DANBURY | 2014-03-25 | yes | yes |
| 475-330 | CSC VOICE, LLC | FAIRFIELD | 2015-06-01 | yes | yes |
| 475-331 | Verizon | NEW HAVEN | 2016-01-28 | yes | yes |
| 475-332 | Verizon | BRIDGEPORT | 2022-02-08 | yes | yes |
| 475-333 | Telnyx | STAMFORD | 2017-02-27 | yes | yes |
| 475-334 | Onvoy | STAMFORD | 2023-07-12 | yes | yes |
| 475-335 | Onvoy | GREENWICH | 2023-07-26 | yes | yes |
| 475-336 | FRACTEL, LLC | DARIEN | 2020-07-21 | yes | yes |
| 475-337 | T-Mobile | WATERBURY | 2022-09-26 | yes | yes |
| 475-338 | Comcast | BRANFORD | 2017-09-21 | yes | yes |
| 475-339 | T-Mobile | ANSONIDRBY | 2022-04-26 | yes | yes |
| 475-340 | Onvoy | OLDGRNWICH | 2023-09-06 | yes | yes |
| 475-341 | T-Mobile | WATERBURY | 2023-10-11 | yes | yes |
| 475-342 | TON80 COMMUNICATIONS, LLC | ANSONIDRBY | 2022-01-07 | yes | yes |
| 475-343 | T-Mobile | MERIDEN | 2014-12-24 | yes | yes |
| 475-344 | Comcast | BRIDGEPORT | 2023-10-18 | yes | yes |
| 475-345 | FRACTEL, LLC | BRIDGEPORT | 2020-07-21 | yes | yes |
| 475-346 | Onvoy | STAMFORD | 2023-12-08 | yes | yes |
| 475-347 | AT&T | MERIDEN | 2023-12-28 | yes | yes |
| 475-348 | AT&T | DANBURY | 2020-03-18 | yes | yes |
| 475-349 | T-Mobile | BRIDGEPORT | 2024-01-11 | yes | yes |
| 475-350 | Verizon | STAMFORD | 2015-11-16 | yes | yes |
| 475-351 | T-Mobile | BRIDGEPORT | 2022-01-14 | yes | yes |
| 475-352 | Onvoy | NEW HAVEN | 2024-01-11 | yes | yes |
| 475-353 | T-Mobile | FAIRFIELD | 2024-01-12 | yes | yes |
| 475-354 | Onvoy | WATERBURY | 2024-01-25 | yes | yes |
| 475-355 | Verizon | NEW HAVEN | 2014-05-22 | yes | yes |
| 475-356 | FRACTEL, LLC | BRIDGEPORT | 2022-03-09 | yes | yes |
| 475-357 | Onvoy | MILFORD | 2024-01-30 | yes | yes |
| 475-358 | Onvoy | BRANFORD | 2024-02-02 | yes | yes |
| 475-359 | Verizon | STAMFORD | 2017-04-14 | yes | yes |
| 475-360 | Onvoy | NEWTOWN | 2024-02-02 | yes | yes |
| 475-361 | Onvoy | CHESHIRE | 2024-02-02 | yes | yes |
| 475-362 | Onvoy | SEYMOUR | 2024-02-21 | yes | yes |
| 475-363 | Onvoy | WESTPORT | 2024-02-21 | yes | yes |
| 475-364 | Onvoy | WOODBURY | 2024-02-21 | yes | yes |
| 475-365 | Onvoy | NEW HAVEN | 2024-03-28 | yes | yes |
| 475-366 | T-Mobile | ANSONIDRBY | 2024-03-13 | yes | yes |
| 475-367 | Onvoy | BYRAM | 2024-03-28 | yes | yes |
| 475-368 | Onvoy | DARIEN | 2024-05-01 | yes | yes |
| 475-369 | Onvoy | HUNTINGTON | 2024-05-15 | yes | yes |
| 475-370 | Dish | DANBURY | 2024-05-20 | yes | yes |
| 475-371 | Dish | NEW CANAAN | 2024-05-20 | yes | yes |
| 475-372 | Onvoy | NEW HAVEN | 2024-06-18 | yes | yes |
| 475-373 | Onvoy | BRIDGEPORT | 2024-06-21 | yes | yes |
| 475-374 | T-Mobile | ANSONIDRBY | 2024-09-12 | yes | yes |
| 475-375 | Onvoy | NEW HAVEN | 2023-06-14 | yes | yes |
| 475-376 | EON TELECOM, INC. | NEWTOWN | 2024-10-07 | yes | yes |
| 475-377 | FRACTEL, LLC | WATERBURY | 2020-07-22 | yes | yes |
| 475-378 | EON TELECOM, INC. | NEW CANAAN | 2024-10-07 | yes | yes |
| 475-379 | EON TELECOM, INC. | NEW HAVEN | 2024-10-07 | yes | yes |
| 475-380 | EON TELECOM, INC. | DANBURY | 2024-10-09 | yes | yes |
| 475-381 | Onvoy | WALLINGFD | 2024-10-14 | yes | yes |
| 475-382 | TON80 COMMUNICATIONS, LLC | BRANFORD | 2022-01-24 | yes | yes |
| 475-383 | Onvoy | GREENWICH | 2024-11-21 | yes | yes |
| 475-384 | Onvoy | NEW HAVEN | 2024-11-21 | yes | yes |
| 475-385 | AT&T | STAMFORD | 2025-01-08 | yes | yes |
| 475-386 | AT&T | TRUMBULL | 2025-02-07 | yes | yes |
| 475-387 | AT&T | NEW HAVEN | 2025-02-07 | yes | yes |
| 475-388 | AT&T | STAMFORD | 2025-02-07 | yes | yes |
| 475-389 | AT&T | WATERBURY | 2025-02-07 | yes | yes |
| 475-390 | AT&T | NEW HAVEN | 2025-03-26 | yes | yes |
| 475-391 | Onvoy | BRIDGEPORT | 2025-04-08 | yes | yes |
| 475-392 | Onvoy | NEW HAVEN | 2025-04-16 | yes | yes |
| 475-393 | T-Mobile | NORWALK | 2017-07-12 | yes | yes |
| 475-394 | AT&T | ANSONIDRBY | 2025-07-29 | yes | yes |
| 475-395 | Verizon | NORWALK | 2015-09-17 | yes | yes |
| 475-396 | CSC VOICE, LLC | BRIDGEPORT | 2025-08-06 | yes | yes |
| 475-397 | Altice | NORWALK | 2025-10-14 | yes | yes |
| 475-398 | Onvoy | HUNTINGTON | 2025-12-12 | yes | yes |
| 475-399 | Verizon | STAMFORD | 2015-09-17 | yes | yes |
| 475-400 | Onvoy | STAMFORD | 2017-11-21 | yes | yes |
| 475-401 | Onvoy | GUILFORD | 2026-07-30 | yes | no |
| 475-402 | Onvoy | NEW HAVEN | 2026-08-06 | yes | yes |
| 475-403 | Onvoy | WATERBURY | 2026-08-06 | yes | yes |
| 475-404 | Onvoy | ANSONIDRBY | 2026-09-09 | yes | no |
| 475-405 | Onvoy | CHESHIRE | 2020-05-28 | yes | yes |
| 475-406 | T-Mobile | NAUGATUCK | 2026-09-23 | yes | no |
| 475-410 | Charter | WOODBURY | 2021-02-12 | yes | yes |
| 475-414 | Verizon | NEW HAVEN | 2015-09-17 | yes | yes |
| 475-419 | Verizon | STAMFORD | 2015-07-01 | yes | yes |
| 475-422 | Verizon | BRIDGEPORT | 2012-12-20 | yes | yes |
| 475-426 | TON80 COMMUNICATIONS, LLC | RIDGEFIELD | 2022-01-13 | yes | yes |
| 475-434 | T-Mobile | NEW HAVEN | 2014-11-25 | yes | yes |
| 475-439 | AT&T | ANSONIDRBY | 2015-08-05 | yes | yes |
| 475-441 | Verizon | NEW HAVEN | 2015-01-20 | yes | yes |
| 475-444 | Peerless | NEWTOWN | 2013-02-08 | yes | yes |
| 475-445 | Onvoy | NEWTOWN | 2020-06-11 | yes | yes |
| 475-447 | Charter | BYRAM | 2021-03-23 | yes | yes |
| 475-449 | T-Mobile | BRIDGEPORT | – | yes | yes |
| 475-450 | BARR TEL USA, INC. - CT | BRIDGEPORT | 2022-03-02 | yes | yes |
| 475-454 | Onvoy | DANBURY | 2020-10-26 | yes | yes |
| 475-455 | FRACTEL, LLC | ANSONIDRBY | 2020-07-21 | yes | yes |
| 475-459 | Verizon | NORWALK | 2018-04-20 | yes | yes |
| 475-463 | TON80 COMMUNICATIONS, LLC | SEYMOUR | 2022-01-18 | yes | yes |
| 475-465 | Onvoy | OLDGRNWICH | – | yes | yes |
| 475-466 | TON80 COMMUNICATIONS, LLC | MADISON | 2022-01-13 | yes | yes |
| 475-467 | TON80 COMMUNICATIONS, LLC | TRUMBULL | 2022-01-25 | yes | yes |
| 475-470 | Onvoy | NORWALK | 2016-02-11 | yes | yes |
| 475-471 | Onvoy | WESTPORT | 2019-07-15 | yes | yes |
| 475-472 | Onvoy | WILTON | 2019-07-15 | yes | yes |
| 475-473 | Onvoy | WOODBURY | 2019-07-15 | yes | yes |
| 475-474 | Onvoy | TRUMBULL | 2021-02-04 | yes | yes |
| 475-475 | Onvoy | MADISON | 2026-10-12 | yes | no |
| 475-476 | Onvoy | BRIDGEPORT | 2019-03-26 | yes | yes |
| 475-477 | Onvoy | STAMFORD | 2019-12-17 | yes | yes |
| 475-480 | BARR TEL USA, INC. - CT | NEW HAVEN | 2022-03-02 | yes | yes |
| 475-489 | Verizon | NORWALK | 2015-11-17 | yes | yes |
| 475-500 | Onvoy | GREENWICH | 2019-07-15 | yes | yes |
| 475-501 | Onvoy | GEORGETOWN | 2020-06-11 | yes | yes |
| 475-509 | Altice | GREENWICH | 2026-06-26 | yes | no |
| 475-522 | Bandwidth | MADISON | 2015-04-23 | yes | yes |
| 475-529 | Verizon | DANBURY | 2011-09-16 | yes | yes |
| 475-544 | T-Mobile | NORWALK | 2022-01-14 | yes | yes |
| 475-548 | TON80 COMMUNICATIONS, LLC | MERIDEN | 2022-01-27 | yes | yes |
| 475-549 | Bandwidth | MILFORD | 2015-04-23 | yes | yes |
| 475-550 | BARR TEL USA, INC. - CT | STAMFORD | 2022-03-02 | yes | yes |
| 475-557 | Verizon | WATERBURY | 2018-11-27 | yes | yes |
| 475-558 | Bandwidth | NEW CANAAN | 2015-04-23 | yes | yes |
| 475-559 | Verizon | WATERBURY | 2015-09-04 | yes | yes |
| 475-575 | Onvoy | RIDGEFIELD | 2020-05-13 | yes | yes |
| 475-600 | Onvoy | SEYMOUR | 2019-07-15 | yes | yes |
| 475-619 | AT&T | STAMFORD | 2014-12-23 | yes | yes |
| 475-622 | TON80 COMMUNICATIONS, LLC | WOLCOTT | 2022-01-17 | yes | yes |
| 475-639 | TON80 COMMUNICATIONS, LLC | REDDING | 2022-01-25 | yes | yes |
| 475-644 | TON80 COMMUNICATIONS, LLC | GEORGETOWN | 2022-01-27 | yes | yes |
| 475-655 | T-Mobile | NEW HAVEN | 2015-01-23 | yes | yes |
| 475-666 | Peerless | WESTPORT | 2016-04-21 | yes | yes |
| 475-673 | TON80 COMMUNICATIONS, LLC | NORWALK | 2022-01-10 | yes | yes |
| 475-675 | Bandwidth | SEYMOUR | 2013-01-30 | yes | yes |
| 475-678 | AT&T | DANBURY | 2025-10-27 | yes | yes |
| 475-685 | Verizon | STAMFORD | 2018-08-28 | yes | yes |
| 475-688 | FRACTEL, LLC | MERIDEN | 2020-07-21 | yes | yes |
| 475-689 | Verizon | WATERBURY | 2014-12-24 | yes | yes |
| 475-701 | Peerless | NAUGATUCK | 2018-09-21 | yes | yes |
| 475-731 | T-Mobile | ANSONIDRBY | 2015-08-10 | yes | yes |
| 475-739 | Peerless | WOLCOTT | 2019-03-05 | yes | yes |
| 475-746 | TON80 COMMUNICATIONS, LLC | STAMFORD | 2022-01-07 | yes | yes |
| 475-747 | Verizon | NORWALK | 2015-06-04 | yes | yes |
| 475-750 | BARR TEL USA, INC. - CT | DANBURY | 2022-03-02 | yes | yes |
| 475-755 | FRACTEL, LLC | NORWALK | 2020-07-22 | yes | yes |
| 475-758 | FRACTEL, LLC | NEW CANAAN | 2020-07-22 | yes | yes |
| 475-763 | TON80 COMMUNICATIONS, LLC | NAUGATUCK | 2022-01-18 | yes | yes |
| 475-766 | FRACTEL, LLC | NEW HAVEN | 2020-07-22 | yes | yes |
| 475-775 | Onvoy | MERIDEN | 2016-02-05 | yes | yes |
| 475-777 | Peerless | ANSONIDRBY | 2014-10-07 | yes | yes |
| 475-800 | Onvoy | NEW HAVEN | 2017-09-28 | yes | yes |
| 475-832 | TON80 COMMUNICATIONS, LLC | WILTON | 2022-01-10 | yes | yes |
| 475-837 | TON80 COMMUNICATIONS, LLC | NEW HAVEN | 2020-10-29 | yes | yes |
| 475-850 | BARR TEL USA, INC. - CT | NORWALK | 2022-03-02 | yes | yes |
| 475-867 | COMMIO, LLC | DANBURY | 2022-09-13 | yes | yes |
| 475-877 | FRACTEL, LLC | REDDING | 2020-07-22 | yes | yes |
| 475-882 | Windstream | HUNTINGTON | 2009-08-07 | yes | yes |
| 475-887 | TON80 COMMUNICATIONS, LLC | WESTPORT | 2022-01-13 | yes | yes |
| 475-888 | Peerless | FAIRFIELD | 2014-10-07 | yes | yes |
| 475-889 | Verizon | NORWALK | 2018-02-09 | yes | yes |
| 475-897 | CSC VOICE, LLC | GREENWICH | 2015-06-05 | yes | yes |
| 475-900 | Onvoy | GUILFORD | 2019-07-15 | yes | yes |
| 475-946 | FRACTEL, LLC | OLDGRNWICH | 2020-07-21 | yes | yes |
| 475-977 | FRACTEL, LLC | STAMFORD | 2020-07-22 | yes | yes |
| 475-988 | T-Mobile | BRIDGEPORT | 2015-02-03 | yes | yes |
| 475-996 | Onvoy | MILFORD | 2026-08-27 | yes | yes |
| 475-997 | Onvoy | CHESHIRE | 2026-07-21 | yes | no |
| 475-998 | Onvoy | FAIRFIELD | 2026-07-08 | yes | yes |
| 475-999 | Peerless | FAIRFIELD | 2013-02-08 | yes | yes |
Frequently asked
How many prefixes does area code 475 have?
292 NXX blocks are assigned of 786 possible. Each block is 10,000 consecutive numbers, so the code currently covers about 2,920 thousand-number ranges across 32 rate centers.
What do the first three digits after 475 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 475 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 475 table?
That the block is in thousands-block pooling: carriers draw 1,000-number lots from it instead of taking all 10,000. 292 of 475'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