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10 prefixes in 857 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 857-244 | BOSTON | 990E | 2008-06-10 | Yes |
| 857-314 | MILTON | 990E | 2015-01-28 | Yes |
| 857-341 | BELMONT | 990E | 2019-02-07 | Yes |
| 857-349 | WINTHROP | 990E | 2018-09-20 | Yes |
| 857-399 | ROXBURY | 990E | 2001-06-29 | Yes |
| 857-400 | BOSTON | 990E | 2010-11-03 | Yes |
| 857-410 | CHARLESTN | 990E | 2016-08-12 | Yes |
| 857-576 | BROOKLINE | 990E | — | Yes |
| 857-600 | CAMBRIDGE | 990E | 2011-04-06 | Yes |
| 857-760 | WATERTOWN | 990E | 2016-06-21 | 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.