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18 prefixes in 475 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 475-219 | WOLCOTT | 199F | 2015-04-16 | Yes |
| 475-221 | BRANFORD | 199F | 2014-08-15 | Yes |
| 475-262 | HUNTINGTON | 199F | 2019-05-23 | Yes |
| 475-265 | TRUMBULL | 199F | 2020-02-05 | Yes |
| 475-273 | BRIDGEPORT | 199F | 2020-06-22 | Yes |
| 475-274 | GUILFORD | 199F | 2020-07-15 | Yes |
| 475-282 | BRIDGEPORT | 199F | 2011-08-29 | Yes |
| 475-285 | NAUGATUCK | 199F | 2020-07-15 | Yes |
| 475-290 | DANBURY | 199F | 2021-08-31 | Yes |
| 475-297 | NEWTOWN | 199F | 2021-09-27 | Yes |
| 475-310 | WALLINGFD | 199F | 2021-11-18 | Yes |
| 475-315 | CHESHIRE | 199F | 2021-09-29 | Yes |
| 475-325 | GEORGETOWN | 199F | 2014-12-01 | Yes |
| 475-329 | DANBURY | 199F | 2014-03-25 | Yes |
| 475-522 | MADISON | 199F | 2015-04-23 | Yes |
| 475-549 | MILFORD | 199F | 2015-04-23 | Yes |
| 475-558 | NEW CANAAN | 199F | 2015-04-23 | Yes |
| 475-675 | SEYMOUR | 199F | 2013-01-30 | 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.