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40 prefixes in 203 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 203-286 | NORWALK | 829J | — | Yes |
| 203-306 | MILFORD | 829J | — | Yes |
| 203-405 | WOODBURY | 829J | 2001-04-04 | Yes |
| 203-413 | GREENWICH | 829J | — | — |
| 203-504 | STAMFORD | 829J | 2004-02-12 | Yes |
| 203-508 | NEW HAVEN | 829J | 2005-02-03 | Yes |
| 203-538 | HUNTINGTON | 829J | — | Yes |
| 203-549 | BRIDGEPORT | 829J | — | Yes |
| 203-567 | HUNTINGTON | 829J | — | Yes |
| 203-568 | WATERBURY | 829J | — | Yes |
| 203-608 | MERIDEN | 829J | — | Yes |
| 203-610 | BRIDGEPORT | 829J | — | Yes |
| 203-621 | DARIEN | 829J | — | Yes |
| 203-632 | NAUGATUCK | 829J | — | Yes |
| 203-638 | TRUMBULL | 829J | — | Yes |
| 203-643 | BRANFORD | 829J | — | Yes |
| 203-647 | MILFORD | 829J | — | — |
| 203-649 | CHESHIRE | 829J | — | Yes |
| 203-651 | CHESHIRE | 829J | — | Yes |
| 203-652 | NEW CANAAN | 829J | — | Yes |
| 203-653 | STAMFORD | 829J | — | Yes |
| 203-659 | FAIRFIELD | 829J | — | Yes |
| 203-663 | NORWALK | 829J | — | Yes |
| 203-665 | WILTON | 829J | — | Yes |
| 203-672 | NEW HAVEN | 829J | — | — |
| 203-678 | WALLINGFD | 829J | — | Yes |
| 203-682 | WESTPORT | 829J | — | Yes |
| 203-683 | BRIDGEPORT | 829J | — | Yes |
| 203-702 | DANBURY | 829J | — | Yes |
| 203-706 | WATERBURY | 829J | 2004-02-12 | Yes |
| 203-724 | STAMFORD | 829J | — | Yes |
| 203-738 | GUILFORD | 829J | — | Yes |
| 203-774 | WALLINGFD | 829J | — | Yes |
| 203-779 | MADISON | 829J | — | Yes |
| 203-841 | WATERBURY | 829J | — | Yes |
| 203-848 | NEW HAVEN | 829J | — | Yes |
| 203-886 | MERIDEN | 829J | — | Yes |
| 203-907 | NEW HAVEN | 829J | — | Yes |
| 203-954 | ANSONIDRBY | 829J | — | Yes |
| 203-983 | GREENWICH | 829J | — | 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.