All assignees
304 prefixes in 475 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 475-300 | NEW HAVEN | 197D | 2016-06-03 | Yes |
| 475-301 | NEW HAVEN | 6624 | 2021-11-18 | Yes |
| 475-302 | BRIDGEPORT | 639C | 2021-10-05 | Yes |
| 475-303 | GREENWICH | 478J | 2020-09-03 | Yes |
| 475-304 | HUNTINGTON | 639C | 2021-10-05 | Yes |
| 475-305 | WATERBURY | 6624 | 2021-08-12 | Yes |
| 475-306 | NEW HAVEN | 6388 | 2021-11-05 | Yes |
| 475-307 | MERIDEN | 6624 | 2021-11-18 | Yes |
| 475-308 | NEW HAVEN | 6624 | 2021-10-05 | Yes |
| 475-309 | ANSONIDRBY | 6624 | 2021-09-09 | Yes |
| 475-310 | WALLINGFD | 199F | 2021-11-18 | Yes |
| 475-311 | XXXXXXXXXX | MULT | — | — |
| 475-312 | BRIDGEPORT | 6624 | 2020-10-30 | Yes |
| 475-313 | WATERBURY | 6624 | 2015-09-09 | Yes |
| 475-314 | HUNTINGTON | 321J | 2022-08-12 | Yes |
| 475-315 | CHESHIRE | 199F | 2021-09-29 | Yes |
| 475-316 | WATERBURY | 6624 | 2022-01-14 | Yes |
| 475-317 | NEW HAVEN | 6624 | 2023-01-06 | Yes |
| 475-318 | NEW HAVEN | 6388 | 2023-02-14 | Yes |
| 475-319 | BRIDGEPORT | 6388 | 2016-09-29 | Yes |
| 475-320 | ANSONIDRBY | 6624 | 2021-12-03 | Yes |
| 475-321 | NEW HAVEN | 6388 | 2022-09-13 | Yes |
| 475-322 | NORWALK | 6388 | 2016-04-25 | Yes |
| 475-323 | NEWTOWN | 6624 | 2015-07-29 | Yes |
| 475-324 | TRUMBULL | 639C | 2023-06-23 | Yes |
| 475-325 | GEORGETOWN | 199F | 2014-12-01 | Yes |
| 475-326 | WATERBURY | 6624 | 2023-06-23 | Yes |
| 475-327 | MILFORD | 516J | 2022-01-13 | Yes |
| 475-328 | DARIEN | 7230 | 2014-04-30 | Yes |
| 475-329 | DANBURY | 199F | 2014-03-25 | Yes |
| 475-330 | FAIRFIELD | 612K | 2015-06-01 | Yes |
| 475-331 | NEW HAVEN | 6388 | 2016-01-28 | Yes |
| 475-332 | BRIDGEPORT | 6388 | 2022-02-08 | Yes |
| 475-333 | STAMFORD | 073H | 2017-02-27 | Yes |
| 475-334 | STAMFORD | 639C | 2023-07-12 | Yes |
| 475-335 | GREENWICH | 639C | 2023-07-26 | Yes |
| 475-336 | DARIEN | 965H | 2020-07-21 | Yes |
| 475-337 | WATERBURY | 6624 | 2022-09-26 | Yes |
| 475-338 | BRANFORD | 318J | 2017-09-21 | Yes |
| 475-339 | ANSONIDRBY | 6624 | 2022-04-26 | Yes |
| 475-340 | OLDGRNWICH | 639C | 2023-09-06 | Yes |
| 475-341 | WATERBURY | 6624 | 2023-10-11 | Yes |
| 475-342 | ANSONIDRBY | 516J | 2022-01-07 | Yes |
| 475-343 | MERIDEN | 5562 | 2014-12-24 | Yes |
| 475-344 | BRIDGEPORT | 318J | 2023-10-18 | Yes |
| 475-345 | BRIDGEPORT | 965H | 2020-07-21 | Yes |
| 475-346 | STAMFORD | 639C | 2023-12-08 | Yes |
| 475-347 | MERIDEN | 4036 | 2023-12-28 | Yes |
| 475-348 | DANBURY | 4036 | 2020-03-18 | Yes |
| 475-349 | BRIDGEPORT | 6624 | 2024-01-11 | Yes |
| 475-350 | STAMFORD | 6388 | 2015-11-16 | Yes |
| 475-351 | BRIDGEPORT | 6624 | 2022-01-14 | Yes |
| 475-352 | NEW HAVEN | 639C | 2024-01-11 | Yes |
| 475-353 | FAIRFIELD | 6624 | 2024-01-12 | Yes |
| 475-354 | WATERBURY | 639C | 2024-01-25 | Yes |
| 475-355 | NEW HAVEN | 6388 | 2014-05-22 | Yes |
| 475-356 | BRIDGEPORT | 965H | 2022-03-09 | Yes |
| 475-357 | MILFORD | 639C | 2024-01-30 | Yes |
| 475-358 | BRANFORD | 639C | 2024-02-02 | Yes |
| 475-359 | STAMFORD | 6388 | 2017-04-14 | Yes |
| 475-360 | NEWTOWN | 639C | 2024-02-02 | Yes |
| 475-361 | CHESHIRE | 639C | 2024-02-02 | Yes |
| 475-362 | SEYMOUR | 639C | 2024-02-21 | Yes |
| 475-363 | WESTPORT | 639C | 2024-02-21 | Yes |
| 475-364 | WOODBURY | 639C | 2024-02-21 | Yes |
| 475-365 | NEW HAVEN | 639C | 2024-03-28 | Yes |
| 475-366 | ANSONIDRBY | 6624 | 2024-03-13 | Yes |
| 475-367 | BYRAM | 639C | 2024-03-28 | Yes |
| 475-368 | DARIEN | 639C | 2024-05-01 | Yes |
| 475-369 | HUNTINGTON | 639C | 2024-05-15 | Yes |
| 475-370 | DANBURY | 490J | 2024-05-20 | Yes |
| 475-371 | NEW CANAAN | 490J | 2024-05-20 | Yes |
| 475-372 | NEW HAVEN | 639C | 2024-06-18 | Yes |
| 475-373 | BRIDGEPORT | 639C | 2024-06-21 | Yes |
| 475-374 | ANSONIDRBY | 6624 | 2024-09-12 | Yes |
| 475-375 | NEW HAVEN | 639C | 2023-06-14 | Yes |
| 475-376 | NEWTOWN | 839J | 2024-10-07 | Yes |
| 475-377 | WATERBURY | 965H | 2020-07-22 | Yes |
| 475-378 | NEW CANAAN | 839J | 2024-10-07 | Yes |
| 475-379 | NEW HAVEN | 839J | 2024-10-07 | Yes |
| 475-380 | DANBURY | 839J | 2024-10-09 | Yes |
| 475-381 | WALLINGFD | 639C | 2024-10-14 | Yes |
| 475-382 | BRANFORD | 516J | 2022-01-24 | Yes |
| 475-383 | GREENWICH | 639C | 2024-11-21 | Yes |
| 475-384 | NEW HAVEN | 639C | 2024-11-21 | Yes |
| 475-385 | STAMFORD | 4036 | 2025-01-08 | Yes |
| 475-386 | TRUMBULL | 4036 | 2025-02-07 | Yes |
| 475-387 | NEW HAVEN | 4036 | 2025-02-07 | Yes |
| 475-388 | STAMFORD | 4036 | 2025-02-07 | Yes |
| 475-389 | WATERBURY | 4036 | 2025-02-07 | Yes |
| 475-390 | NEW HAVEN | 4036 | 2025-03-26 | Yes |
| 475-391 | BRIDGEPORT | 639C | 2025-04-08 | Yes |
| 475-392 | NEW HAVEN | 639C | 2025-04-16 | Yes |
| 475-393 | NORWALK | 6624 | 2017-07-12 | Yes |
| 475-394 | ANSONIDRBY | 7421 | 2025-07-29 | Yes |
| 475-395 | NORWALK | 6388 | 2015-09-17 | Yes |
| 475-396 | BRIDGEPORT | 612K | 2025-08-06 | Yes |
| 475-397 | NORWALK | 4950 | 2025-10-14 | Yes |
| 475-398 | HUNTINGTON | 639C | 2025-12-12 | Yes |
| 475-399 | STAMFORD | 6388 | 2015-09-17 | Yes |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.