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21 prefixes in 508 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 508-251 | MARLBORO | 318J | — | Yes |
| 508-276 | WAYLAND | 318J | — | Yes |
| 508-297 | EASTON | 318J | — | Yes |
| 508-316 | NO ATTLEBO | 318J | — | Yes |
| 508-321 | MEDWAY | 318J | — | Yes |
| 508-348 | CHATHAM | 318J | — | Yes |
| 508-381 | MILFORD | 318J | — | Yes |
| 508-386 | TAUNTON | 318J | — | Yes |
| 508-455 | ATTLEBORO | 318J | — | Yes |
| 508-456 | EBRIDGEWTR | 318J | — | Yes |
| 508-465 | CARVER | 318J | 2006-10-23 | Yes |
| 508-545 | NATICK | 318J | — | Yes |
| 508-557 | SEEKONK | 318J | — | Yes |
| 508-567 | FALL RIVER | 318J | — | Yes |
| 508-622 | NORTON | 318J | — | Yes |
| 508-625 | HOPKINTON | 318J | — | Yes |
| 508-657 | BELLINGHAM | 318J | — | Yes |
| 508-794 | MILLIS | 318J | — | Yes |
| 508-807 | BRIDGEWTR | 318J | — | Yes |
| 508-857 | BROCKTON | 318J | — | Yes |
| 508-928 | BLACKSTONE | 318J | — | 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.