All assignees
799 prefixes in 631 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 631-200 | BAYPORT | 7133 | 2003-12-08 | Yes |
| 631-201 | AMITYVILLE | 384C | 2016-02-08 | Yes |
| 631-202 | RONKONKOMA | 384C | 2016-02-09 | Yes |
| 631-203 | CENTRAISLP | 384C | — | Yes |
| 631-204 | SOUTHAMPTN | 9104 | — | Yes |
| 631-205 | YAPHANK | 9104 | — | Yes |
| 631-206 | BAY SHORE | 9104 | — | Yes |
| 631-207 | PATCHOGUE | 9104 | — | Yes |
| 631-208 | RIVERHEAD | 9104 | — | Yes |
| 631-209 | SHOREHAM | 9104 | — | Yes |
| 631-210 | ISLIP | 829J | — | Yes |
| 631-211 | XXXXXXXXXX | MULT | — | — |
| 631-212 | COMMACK | 384C | 2016-02-15 | Yes |
| 631-213 | MIDLAND | 7140 | — | Yes |
| 631-214 | DEER PARK | 612K | 2015-05-21 | Yes |
| 631-215 | BRENTWOOD | 5562 | 2016-04-22 | Yes |
| 631-216 | STONYBROOK | 9104 | — | — |
| 631-217 | STONYBROOK | 8667 | — | — |
| 631-218 | SAYVILLE | 9104 | — | — |
| 631-219 | BRENTWOOD | 6959 | 2003-10-13 | Yes |
| 631-220 | BRENTWOOD | 6622 | — | — |
| 631-221 | NASSAUZN09 | 9104 | — | Yes |
| 631-222 | XXXXXXXXXX | 9104 | — | — |
| 631-223 | HUNTINGTON | 7133 | — | Yes |
| 631-224 | ISLIP | 9104 | — | — |
| 631-225 | LINDENHST | 9104 | — | — |
| 631-226 | LINDENHST | 9104 | — | — |
| 631-227 | FARMINGDL | 829J | — | — |
| 631-228 | SHOREHAM | 7133 | — | Yes |
| 631-229 | AMITYVILLE | 7133 | — | Yes |
| 631-230 | MONTAUK PT | 155E | 2012-09-06 | Yes |
| 631-231 | BRENTWOOD | 9104 | — | — |
| 631-232 | CENTRAISLP | 9104 | — | — |
| 631-233 | BRENTWOOD | 9104 | — | Yes |
| 631-234 | CENTRAISLP | 9104 | — | — |
| 631-235 | BRENTWOOD | 6959 | 2002-10-18 | Yes |
| 631-236 | BRENTWOOD | 4006 | — | Yes |
| 631-237 | BRIDGEMPTN | 7126 | 2001-09-25 | Yes |
| 631-238 | MONTAUK PT | 612K | 2001-09-25 | Yes |
| 631-239 | NORTHPORT | 7140 | — | Yes |
| 631-240 | SMITHTOWN | 4006 | 2001-10-30 | Yes |
| 631-241 | BRENTWOOD | 6959 | 2003-06-05 | Yes |
| 631-242 | DEER PARK | 9104 | — | — |
| 631-243 | DEER PARK | 9104 | — | — |
| 631-244 | SAYVILLE | 9104 | — | — |
| 631-245 | BRENTWOOD | 4036 | 2005-08-16 | Yes |
| 631-246 | STONYBROOK | 9104 | — | Yes |
| 631-247 | FARMINGDL | 7140 | — | Yes |
| 631-248 | E HAMPTON | 155E | 2012-09-06 | Yes |
| 631-249 | FARMINGDL | 9104 | — | — |
| 631-250 | ST JAMES | 612K | 2013-04-09 | Yes |
| 631-251 | SAG HARBOR | 4006 | — | Yes |
| 631-252 | BRENTWOOD | 6959 | 2003-02-04 | Yes |
| 631-253 | MIDLAND | 9104 | — | Yes |
| 631-254 | DEER PARK | 9104 | — | — |
| 631-255 | RIVERHEAD | 4036 | 2002-07-22 | Yes |
| 631-256 | SAYVILLE | 7140 | — | Yes |
| 631-257 | SMITHTOWN | 7126 | 2012-05-30 | Yes |
| 631-258 | BRENTWOOD | 6959 | 2002-08-15 | Yes |
| 631-259 | SOUTHAMPTN | 9104 | — | Yes |
| 631-260 | BRENTWOOD | 6959 | 2014-08-28 | Yes |
| 631-261 | NORTHPORT | 9104 | — | — |
| 631-262 | NORTHPORT | 9104 | — | — |
| 631-263 | SMITHTOWN | 6959 | — | — |
| 631-264 | AMITYVILLE | 9104 | — | Yes |
| 631-265 | SMITHTOWN | 9104 | — | — |
| 631-266 | W COMMACK | 9104 | — | Yes |
| 631-267 | AMAGANSETT | 9104 | — | Yes |
| 631-268 | SOUTHAMPTN | 155E | 2013-04-04 | Yes |
| 631-269 | KINGS PARK | 9104 | — | Yes |
| 631-270 | FARMINGDL | 7133 | — | Yes |
| 631-271 | HUNTINGTON | 9104 | — | — |
| 631-272 | CENTRAISLP | 9104 | — | Yes |
| 631-273 | BRENTWOOD | 9104 | — | — |
| 631-274 | DEER PARK | 9104 | — | Yes |
| 631-275 | BRENTWOOD | 6622 | 2003-07-10 | Yes |
| 631-276 | HAMPTNBAYS | 5562 | 2002-10-21 | Yes |
| 631-277 | ISLIP | 9104 | — | — |
| 631-278 | BRENTWOOD | 5562 | 2003-10-21 | Yes |
| 631-279 | BRENTWOOD | 6630 | — | — |
| 631-280 | WESTHAMPTN | 0051 | 2025-09-03 | — |
| 631-281 | ATLANTIC | 9104 | — | — |
| 631-282 | YAPHANK | 9104 | — | Yes |
| 631-283 | SOUTHAMPTN | 9104 | — | — |
| 631-284 | RIVERHEAD | 9104 | — | Yes |
| 631-285 | RONKONKOMA | 9104 | — | Yes |
| 631-286 | BELLPORT | 9104 | — | — |
| 631-287 | SOUTHAMPTN | 9104 | — | — |
| 631-288 | WESTHAMPTN | 9104 | — | — |
| 631-289 | PATCHOGUE | 9104 | — | — |
| 631-290 | BABYLON | 6622 | 2015-07-29 | Yes |
| 631-291 | BRENTWOOD | 5562 | 2003-07-23 | Yes |
| 631-292 | KINGS PARK | 4006 | — | Yes |
| 631-293 | FARMINGDL | 9104 | — | Yes |
| 631-294 | YAPHANK | 6622 | 2002-10-21 | Yes |
| 631-295 | YAPHANK | 4006 | — | Yes |
| 631-296 | BRIDGEMPTN | 612K | 2013-06-28 | Yes |
| 631-297 | CENTRAISLP | 829J | — | Yes |
| 631-298 | MATTITUCK | 9104 | — | Yes |
| 631-299 | BRENTWOOD | 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.