All assignees
304 prefixes in 475 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 475-400 | STAMFORD | 639C | 2017-11-21 | Yes |
| 475-401 | GUILFORD | 639C | 2026-07-30 | Yes |
| 475-402 | NEW HAVEN | 639C | 2026-08-06 | Yes |
| 475-403 | WATERBURY | 639C | 2026-08-06 | Yes |
| 475-404 | ANSONIDRBY | 639C | 2026-09-09 | Yes |
| 475-405 | CHESHIRE | 639C | 2020-05-28 | Yes |
| 475-410 | WOODBURY | 624H | 2021-02-12 | Yes |
| 475-411 | XXXXXXXXXX | MULT | — | — |
| 475-414 | NEW HAVEN | 6388 | 2015-09-17 | Yes |
| 475-419 | STAMFORD | 6388 | 2015-07-01 | Yes |
| 475-422 | BRIDGEPORT | 6388 | 2012-12-20 | Yes |
| 475-426 | RIDGEFIELD | 516J | 2022-01-13 | Yes |
| 475-434 | NEW HAVEN | 5562 | 2014-11-25 | Yes |
| 475-439 | ANSONIDRBY | 4036 | 2015-08-05 | Yes |
| 475-441 | NEW HAVEN | 6388 | 2015-01-20 | Yes |
| 475-444 | NEWTOWN | 539F | 2013-02-08 | Yes |
| 475-445 | NEWTOWN | 639C | 2020-06-11 | Yes |
| 475-447 | BYRAM | 624H | 2021-03-23 | Yes |
| 475-449 | BRIDGEPORT | 6624 | — | Yes |
| 475-450 | BRIDGEPORT | 866H | 2022-03-02 | Yes |
| 475-454 | DANBURY | 639C | 2020-10-26 | Yes |
| 475-455 | ANSONIDRBY | 965H | 2020-07-21 | Yes |
| 475-459 | NORWALK | 6388 | 2018-04-20 | Yes |
| 475-463 | SEYMOUR | 516J | 2022-01-18 | Yes |
| 475-465 | OLDGRNWICH | 639C | — | Yes |
| 475-466 | MADISON | 516J | 2022-01-13 | Yes |
| 475-467 | TRUMBULL | 516J | 2022-01-25 | Yes |
| 475-470 | NORWALK | 639C | 2016-02-11 | Yes |
| 475-471 | WESTPORT | 639C | 2019-07-15 | Yes |
| 475-472 | WILTON | 639C | 2019-07-15 | Yes |
| 475-473 | WOODBURY | 639C | 2019-07-15 | Yes |
| 475-474 | TRUMBULL | 639C | 2021-02-04 | Yes |
| 475-476 | BRIDGEPORT | 639C | 2019-03-26 | Yes |
| 475-477 | STAMFORD | 639C | 2019-12-17 | Yes |
| 475-480 | NEW HAVEN | 866H | 2022-03-02 | Yes |
| 475-489 | NORWALK | 6388 | 2015-11-17 | Yes |
| 475-500 | GREENWICH | 639C | 2019-07-15 | Yes |
| 475-501 | GEORGETOWN | 639C | 2020-06-11 | Yes |
| 475-509 | GREENWICH | 4950 | 2026-06-26 | Yes |
| 475-511 | XXXXXXXXXX | MULT | — | — |
| 475-522 | MADISON | 199F | 2015-04-23 | Yes |
| 475-529 | DANBURY | 6388 | 2011-09-16 | Yes |
| 475-544 | NORWALK | 6624 | 2022-01-14 | Yes |
| 475-548 | MERIDEN | 516J | 2022-01-27 | Yes |
| 475-549 | MILFORD | 199F | 2015-04-23 | Yes |
| 475-550 | STAMFORD | 866H | 2022-03-02 | Yes |
| 475-555 | DIR ASST | MULT | — | — |
| 475-557 | WATERBURY | 6388 | 2018-11-27 | Yes |
| 475-558 | NEW CANAAN | 199F | 2015-04-23 | Yes |
| 475-559 | WATERBURY | 6388 | 2015-09-04 | Yes |
| 475-575 | RIDGEFIELD | 639C | 2020-05-13 | Yes |
| 475-600 | SEYMOUR | 639C | 2019-07-15 | Yes |
| 475-611 | XXXXXXXXXX | MULT | — | — |
| 475-619 | STAMFORD | 7143 | 2014-12-23 | Yes |
| 475-622 | WOLCOTT | 516J | 2022-01-17 | Yes |
| 475-639 | REDDING | 516J | 2022-01-25 | Yes |
| 475-644 | GEORGETOWN | 516J | 2022-01-27 | Yes |
| 475-655 | NEW HAVEN | 6624 | 2015-01-23 | Yes |
| 475-666 | WESTPORT | 539F | 2016-04-21 | Yes |
| 475-673 | NORWALK | 516J | 2022-01-10 | Yes |
| 475-675 | SEYMOUR | 199F | 2013-01-30 | Yes |
| 475-678 | DANBURY | 7143 | 2025-10-27 | Yes |
| 475-685 | STAMFORD | 6388 | 2018-08-28 | Yes |
| 475-688 | MERIDEN | 965H | 2020-07-21 | Yes |
| 475-689 | WATERBURY | 6388 | 2014-12-24 | Yes |
| 475-700 | — | — | ||
| 475-701 | NAUGATUCK | 539F | 2018-09-21 | Yes |
| 475-711 | XXXXXXXXXX | MULT | — | — |
| 475-731 | ANSONIDRBY | 6624 | 2015-08-10 | Yes |
| 475-739 | WOLCOTT | 539F | 2019-03-05 | Yes |
| 475-746 | STAMFORD | 516J | 2022-01-07 | Yes |
| 475-747 | NORWALK | 6388 | 2015-06-04 | Yes |
| 475-750 | DANBURY | 866H | 2022-03-02 | Yes |
| 475-755 | NORWALK | 965H | 2020-07-22 | Yes |
| 475-758 | NEW CANAAN | 965H | 2020-07-22 | Yes |
| 475-763 | NAUGATUCK | 516J | 2022-01-18 | Yes |
| 475-766 | NEW HAVEN | 965H | 2020-07-22 | Yes |
| 475-775 | MERIDEN | 639C | 2016-02-05 | Yes |
| 475-777 | ANSONIDRBY | 539F | 2014-10-07 | Yes |
| 475-800 | NEW HAVEN | 639C | 2017-09-28 | Yes |
| 475-811 | XXXXXXXXXX | MULT | — | — |
| 475-832 | WILTON | 516J | 2022-01-10 | Yes |
| 475-837 | NEW HAVEN | 516J | 2020-10-29 | Yes |
| 475-850 | NORWALK | 866H | 2022-03-02 | Yes |
| 475-867 | DANBURY | 939H | 2022-09-13 | Yes |
| 475-877 | REDDING | 965H | 2020-07-22 | Yes |
| 475-882 | HUNTINGTON | 829J | 2009-08-07 | Yes |
| 475-887 | WESTPORT | 516J | 2022-01-13 | Yes |
| 475-888 | FAIRFIELD | 539F | 2014-10-07 | Yes |
| 475-889 | NORWALK | 6388 | 2018-02-09 | Yes |
| 475-897 | GREENWICH | 612K | 2015-06-05 | Yes |
| 475-900 | GUILFORD | 639C | 2019-07-15 | Yes |
| 475-911 | XXXXXXXXXX | MULT | — | — |
| 475-946 | OLDGRNWICH | 965H | 2020-07-21 | Yes |
| 475-950 | — | — | ||
| 475-958 | — | — | ||
| 475-959 | — | — | ||
| 475-976 | — | — | ||
| 475-977 | STAMFORD | 965H | 2020-07-22 | Yes |
| 475-988 | BRIDGEPORT | 6624 | 2015-02-03 | 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.