Area Code 631
Area code 631 is in New York, USA , spanning 1 county and serving 106 cities, including Brentwood, West Babylon or Coram; it currently uses 781 prefixes, assigned from 631-200-XXXX through 631-999-XXXX.
In service since November 01, 1999, area code 631 is the parent Numbering Plan Area in overlay complex 631/934.
The current local time is .
For exact NPA boundaries see official 631 area code map
Phone number lookup
More New York area codes:
Locate any 631-NXX prefix:
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 631-200 | Bayport | 12/8/2003 |
| 631-201 | Amityville | 2/8/2016 |
| 631-202 | Ronkonkoma | 2/9/2016 |
| 631-203 | Central Islip | N/A |
| 631-204 | Southampton | N/A |
| 631-205 | Yaphank | N/A |
| 631-206 | Bay Shore | N/A |
| 631-207 | Patchogue | N/A |
| 631-208 | Riverhead | N/A |
| 631-209 | Shoreham | N/A |
| 631-210 | Islip | N/A |
| 631-212 | Commack | 2/15/2016 |
| 631-213 | Midland | N/A |
| 631-214 | Deer Park | 5/21/2015 |
| 631-215 | Brentwood | 4/22/2016 |
| 631-216 | Stony Brook | N/A |
| 631-217 | Stony Brook | N/A |
| 631-218 | Sayville | N/A |
| 631-219 | Brentwood | 10/13/2003 |
| 631-220 | Brentwood | N/A |
| 631-221 | Nassau Zone 09 | N/A |
| 631-223 | Huntington | N/A |
| 631-224 | Islip | N/A |
| 631-225 | Lindenhst | N/A |
| 631-226 | Lindenhst | N/A |
| 631-227 | Farmingdale | N/A |
| 631-228 | Shoreham | N/A |
| 631-229 | Amityville | N/A |
| 631-230 | Montauk Point | 9/6/2012 |
| 631-231 | Brentwood | N/A |
| 631-232 | Central Islip | N/A |
| 631-233 | Brentwood | N/A |
| 631-234 | Central Islip | N/A |
| 631-235 | Brentwood | 10/18/2002 |
| 631-236 | Brentwood | N/A |
| 631-237 | Bridgehampton | 9/25/2001 |
| 631-238 | Montauk Point | 9/25/2001 |
| 631-239 | Northport | N/A |
| 631-240 | Smithtown | 10/30/2001 |
| 631-241 | Brentwood | 6/5/2003 |
| 631-242 | Deer Park | N/A |
| 631-243 | Deer Park | N/A |
| 631-244 | Sayville | N/A |
| 631-245 | Brentwood | 8/16/2005 |
| 631-246 | Stony Brook | N/A |
| 631-247 | Farmingdale | N/A |
| 631-248 | East Hampton | 9/6/2012 |
| 631-249 | Farmingdale | N/A |
| 631-250 | St James | 4/9/2013 |
| 631-251 | Sag Harbor | N/A |
| 631-252 | Brentwood | 2/4/2003 |
| 631-253 | Midland | N/A |
| 631-254 | Deer Park | N/A |
| 631-255 | Riverhead | 7/22/2002 |
| 631-256 | Sayville | N/A |
| 631-257 | Smithtown | 5/30/2012 |
| 631-258 | Brentwood | 8/15/2002 |
| 631-259 | Southampton | N/A |
| 631-260 | Brentwood | 8/28/2014 |
| 631-261 | Northport | N/A |
| 631-262 | Northport | N/A |
| 631-263 | Smithtown | N/A |
| 631-264 | Amityville | N/A |
| 631-265 | Smithtown | N/A |
| 631-266 | West Commack | N/A |
| 631-267 | Amagansett | N/A |
| 631-268 | Southampton | 4/4/2013 |
| 631-269 | Kings Park | N/A |
| 631-270 | Farmingdale | N/A |
| 631-271 | Huntington | N/A |
| 631-272 | Central Islip | N/A |
| 631-273 | Brentwood | N/A |
| 631-274 | Deer Park | N/A |
| 631-275 | Brentwood | 7/10/2003 |
| 631-276 | Hampton Bays | 10/21/2002 |
| 631-277 | Islip | N/A |
| 631-278 | Brentwood | 10/21/2003 |
| 631-279 | Brentwood | N/A |
| 631-280 | Brentwood | N/A |
| 631-281 | Atlantic | N/A |
| 631-282 | Yaphank | N/A |
| 631-283 | Southampton | N/A |
| 631-284 | Riverhead | N/A |
| 631-285 | Ronkonkoma | N/A |
| 631-286 | Bellport | N/A |
| 631-287 | Southampton | N/A |
| 631-288 | Westhampton | N/A |
| 631-289 | Patchogue | N/A |
| 631-290 | Babylon | 7/29/2015 |
| 631-291 | Brentwood | 7/23/2003 |
| 631-292 | Kings Park | N/A |
| 631-293 | Farmingdale | N/A |
| 631-294 | Yaphank | 10/21/2002 |
| 631-295 | Yaphank | N/A |
| 631-296 | Bridgehampton | 6/28/2013 |
| 631-297 | Central Islip | N/A |
| 631-298 | Mattituck | N/A |
| 631-299 | Brentwood | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 631-300 | Brentwood | N/A |
| 631-301 | Farmingdale | 12/5/2016 |
| 631-302 | East Fire Island | N/A |
| 631-303 | Amityville | 9/1/2017 |
| 631-304 | Brentwood | 10/13/2015 |
| 631-305 | Brentwood | 2/1/2016 |
| 631-306 | Deer Park | N/A |
| 631-307 | Patchogue | 8/2/2013 |
| 631-308 | Brentwood | 1/8/2020 |
| 631-309 | Amityville | 4/13/2018 |
| 631-310 | Patchogue | 1/24/2017 |
| 631-312 | Patchogue | N/A |
| 631-313 | Islip | 6/14/2018 |
| 631-314 | Babylon | N/A |
| 631-315 | Mattituck | 12/16/2006 |
| 631-316 | Brentwood | 2/21/2007 |
| 631-317 | Patchogue | 12/4/2009 |
| 631-318 | Amagansett | 1/27/2010 |
| 631-319 | Sayville | 2/3/2006 |
| 631-320 | Selden | 8/21/2006 |
| 631-321 | Babylon | N/A |
| 631-322 | Brentwood | N/A |
| 631-323 | Orient | N/A |
| 631-324 | East Hampton | N/A |
| 631-325 | Eastport | N/A |
| 631-326 | Commack | N/A |
| 631-327 | Huntington | 8/27/2002 |
| 631-328 | Bay Shore | N/A |
| 631-329 | East Hampton | N/A |
| 631-330 | Farmingdale | 9/30/2011 |
| 631-331 | Port Jefferson | N/A |
| 631-332 | Brentwood | 2/15/2002 |
| 631-333 | Greenport | 5/5/2009 |
| 631-334 | Central Islip | N/A |
| 631-335 | Brentwood | 7/10/2003 |
| 631-336 | Brentwood | 6/1/2010 |
| 631-337 | Sayville | N/A |
| 631-338 | Brentwood | 2/18/2004 |
| 631-339 | Brentwood | 2/12/2010 |
| 631-340 | Babylon | N/A |
| 631-341 | Yaphank | N/A |
| 631-342 | Central Islip | N/A |
| 631-343 | Commack | 9/10/2003 |
| 631-344 | Yaphank | N/A |
| 631-345 | Yaphank | N/A |
| 631-346 | Selden | 8/19/2010 |
| 631-347 | Brentwood | 12/15/2023 |
| 631-348 | Central Islip | N/A |
| 631-349 | Stony Brook | 9/13/2002 |
| 631-350 | Huntington | N/A |
| 631-351 | Huntington | N/A |
| 631-352 | Smithtown | 8/20/2010 |
| 631-353 | Southampton | 8/26/2010 |
| 631-354 | Mattituck | N/A |
| 631-355 | Brentwood | 8/21/2003 |
| 631-356 | Brentwood | 8/21/2003 |
| 631-357 | Brentwood | N/A |
| 631-358 | Babylon | 9/10/2010 |
| 631-359 | Wading River | 9/6/2012 |
| 631-360 | Smithtown | N/A |
| 631-361 | Smithtown | N/A |
| 631-363 | Bayport | N/A |
| 631-364 | Stony Brook | 11/8/2010 |
| 631-365 | Brentwood | 9/10/2003 |
| 631-366 | Smithtown | N/A |
| 631-367 | Cold Spring Harbor | N/A |
| 631-368 | West Commack | N/A |
| 631-369 | Riverhead | N/A |
| 631-370 | Farmingdale | N/A |
| 631-371 | Stony Brook | 6/17/2002 |
| 631-372 | Brentwood | 12/18/2014 |
| 631-373 | Brentwood | N/A |
| 631-374 | Brentwood | 11/14/2001 |
| 631-375 | Riverhead | 11/14/2001 |
| 631-376 | Babylon | N/A |
| 631-377 | Southampton | 11/21/2006 |
| 631-378 | Shoreham | N/A |
| 631-379 | Brentwood | 1/9/2002 |
| 631-380 | Stony Brook | N/A |
| 631-381 | Riverhead | 6/7/2016 |
| 631-382 | Smithtown | N/A |
| 631-383 | Bay Shore | 6/17/2002 |
| 631-384 | Selden | 5/14/2002 |
| 631-385 | Huntington | N/A |
| 631-386 | Farmingdale | N/A |
| 631-387 | Commack | N/A |
| 631-388 | Brentwood | 10/25/2010 |
| 631-389 | Ronkonkoma | N/A |
| 631-390 | Farmingdale | N/A |
| 631-391 | Farmingdale | N/A |
| 631-392 | Deer Park | 2/14/2006 |
| 631-393 | Farmingdale | N/A |
| 631-394 | Yaphank | 10/26/2010 |
| 631-395 | Atlantic | N/A |
| 631-396 | Farmingdale | N/A |
| 631-397 | Amityville | 2/12/2010 |
| 631-398 | Brentwood | N/A |
| 631-399 | Atlantic | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 631-400 | Center Moriches | N/A |
| 631-401 | Brentwood | 1/13/2020 |
| 631-402 | Brentwood | 2/1/2012 |
| 631-403 | Port Jefferson | 8/23/2006 |
| 631-404 | Brentwood | N/A |
| 631-405 | Riverhead | 2/22/2011 |
| 631-406 | Smithtown | N/A |
| 631-407 | Southold | 3/21/2011 |
| 631-408 | Amityville | 2/6/2012 |
| 631-409 | Nassau Zone 09 | N/A |
| 631-410 | Commack | N/A |
| 631-412 | Lindenhst | N/A |
| 631-413 | Selden | 2/8/2006 |
| 631-414 | Farmingdale | N/A |
| 631-415 | Central Islip | N/A |
| 631-416 | Brentwood | 7/11/2011 |
| 631-417 | Babylon | 10/10/2011 |
| 631-418 | Huntington | 5/3/2001 |
| 631-419 | Bayport | N/A |
| 631-420 | Farmingdale | N/A |
| 631-421 | Huntington | N/A |
| 631-422 | Babylon | N/A |
| 631-423 | Huntington | N/A |
| 631-424 | Huntington | N/A |
| 631-425 | Huntington | N/A |
| 631-426 | Babylon | N/A |
| 631-427 | Huntington | N/A |
| 631-428 | Ronkonkoma | 4/4/2001 |
| 631-429 | Lindenhst | 9/6/2012 |
| 631-430 | Greenport | 4/3/2013 |
| 631-431 | Central Islip | N/A |
| 631-432 | Brentwood | 8/2/2013 |
| 631-433 | Brentwood | 6/26/2002 |
| 631-434 | Brentwood | N/A |
| 631-435 | Brentwood | N/A |
| 631-436 | Brentwood | N/A |
| 631-437 | Fire Island | 10/8/2013 |
| 631-438 | Patchogue | 5/3/2011 |
| 631-439 | Central Islip | N/A |
| 631-440 | Fire Island | N/A |
| 631-441 | Brentwood | N/A |
| 631-442 | Brentwood | N/A |
| 631-443 | Eastport | N/A |
| 631-444 | Stony Brook | N/A |
| 631-445 | Brentwood | 3/15/2001 |
| 631-446 | Islip | 6/7/2007 |
| 631-447 | Patchogue | N/A |
| 631-448 | Yaphank | 8/10/2011 |
| 631-449 | Brentwood | 6/14/2013 |
| 631-450 | Lindenhst | 3/2/2012 |
| 631-451 | Selden | N/A |
| 631-452 | Central Islip | 9/8/2015 |
| 631-453 | Selden | N/A |
| 631-454 | Farmingdale | N/A |
| 631-455 | Deer Park | N/A |
| 631-456 | Brentwood | 2/9/2005 |
| 631-457 | Brentwood | N/A |
| 631-458 | Sag Harbor | N/A |
| 631-459 | Brentwood | 1/27/2012 |
| 631-460 | Kings Park | N/A |
| 631-461 | Riverhead | 9/13/2011 |
| 631-462 | West Commack | N/A |
| 631-463 | Central Islip | N/A |
| 631-464 | Amityville | 6/9/2011 |
| 631-465 | Farmingdale | N/A |
| 631-466 | Riverhead | N/A |
| 631-467 | Ronkonkoma | N/A |
| 631-468 | Ronkonkoma | N/A |
| 631-469 | Brentwood | 4/24/2018 |
| 631-470 | Huntington | N/A |
| 631-471 | Ronkonkoma | N/A |
| 631-472 | Bayport | N/A |
| 631-473 | Port Jefferson | N/A |
| 631-474 | Port Jefferson | N/A |
| 631-475 | Patchogue | N/A |
| 631-476 | Port Jefferson | N/A |
| 631-477 | Greenport | N/A |
| 631-478 | Brentwood | N/A |
| 631-479 | Huntington | N/A |
| 631-480 | Amityville | 3/9/2012 |
| 631-481 | Islip | N/A |
| 631-482 | Babylon | 3/29/2007 |
| 631-483 | Montauk Point | 2/3/2012 |
| 631-484 | Brentwood | 12/31/2001 |
| 631-485 | Midland | N/A |
| 631-486 | West Commack | N/A |
| 631-487 | Brentwood | 7/18/2006 |
| 631-488 | Southampton | 8/21/2007 |
| 631-489 | West Commack | N/A |
| 631-490 | Atlantic | 3/16/2012 |
| 631-491 | Midland | N/A |
| 631-492 | Deer Park | N/A |
| 631-493 | West Commack | N/A |
| 631-494 | Riverhead | 4/21/2009 |
| 631-495 | Brentwood | N/A |
| 631-496 | Selden | 2/20/2012 |
| 631-497 | Huntington | 11/11/2024 |
| 631-498 | Cold Spring Harbor | N/A |
| 631-499 | West Commack | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 631-500 | Water Mill | N/A |
| 631-501 | Farmingdale | N/A |
| 631-502 | Jamesport | 3/16/2012 |
| 631-503 | Center Moriches | N/A |
| 631-504 | Yaphank | 5/23/2006 |
| 631-505 | Lindenhst | 2/24/2010 |
| 631-506 | Riverhead | N/A |
| 631-507 | Amityville | 6/27/2013 |
| 631-508 | Riverhead | 3/13/2018 |
| 631-509 | Port Jefferson | 8/21/2006 |
| 631-510 | Midland | N/A |
| 631-512 | Selden | 2/8/2006 |
| 631-513 | Brentwood | N/A |
| 631-514 | Brentwood | N/A |
| 631-515 | Shelter Island | 10/31/2012 |
| 631-516 | Selden | 03/20/2024 |
| 631-517 | Babylon | N/A |
| 631-518 | Bay Shore | 4/3/2013 |
| 631-519 | East Fire Island | 4/3/2013 |
| 631-520 | Amityville | N/A |
| 631-521 | Brentwood | N/A |
| 631-522 | Deer Park | 4/2/2009 |
| 631-523 | Central Islip | N/A |
| 631-524 | Brentwood | 7/18/2011 |
| 631-525 | Brentwood | 11/4/2003 |
| 631-526 | Babylon | 10/22/2012 |
| 631-527 | East Hampton | 6/3/2011 |
| 631-528 | Kings Park | N/A |
| 631-529 | Orient | N/A |
| 631-530 | Amityville | 11/24/2015 |
| 631-531 | Farmingdale | N/A |
| 631-532 | Amityville | N/A |
| 631-533 | Central Islip | 2/9/2009 |
| 631-534 | Cold Spring Harbor | N/A |
| 631-535 | Port Jefferson | 9/6/2012 |
| 631-536 | Eastport | N/A |
| 631-537 | Bridgehampton | N/A |
| 631-538 | Selden | 8/2/2013 |
| 631-539 | Babylon | N/A |
| 631-540 | Mattituck | 5/12/2020 |
| 631-541 | Nassau Zone 09 | N/A |
| 631-542 | Ronkonkoma | 3/16/2012 |
| 631-543 | Commack | N/A |
| 631-544 | Kings Park | N/A |
| 631-545 | Amityville | 8/20/2012 |
| 631-546 | Huntington | N/A |
| 631-547 | Huntington | N/A |
| 631-548 | Riverhead | N/A |
| 631-549 | Huntington | N/A |
| 631-550 | Yaphank | 3/4/2020 |
| 631-551 | St James | N/A |
| 631-552 | Amityville | 8/22/2013 |
| 631-553 | Brentwood | N/A |
| 631-554 | Brentwood | N/A |
| 631-556 | Brentwood | 11/15/2005 |
| 631-557 | Amagansett | 6/9/2014 |
| 631-558 | Riverhead | N/A |
| 631-559 | Brentwood | 3/30/2006 |
| 631-560 | Brentwood | 9/19/2006 |
| 631-561 | Selden | N/A |
| 631-562 | Patchogue | 10/6/2011 |
| 631-563 | Sayville | N/A |
| 631-564 | Sayville | N/A |
| 631-565 | Amityville | 5/19/2009 |
| 631-566 | Riverhead | 1/5/2006 |
| 631-567 | Sayville | N/A |
| 631-568 | Amityville | 11/13/2013 |
| 631-569 | Patchogue | 5/19/2006 |
| 631-570 | Fire Island | N/A |
| 631-571 | Orient | 4/3/2013 |
| 631-572 | Babylon | 5/27/2009 |
| 631-573 | Sayville | 10/6/2011 |
| 631-574 | Riverhead | N/A |
| 631-575 | Brentwood | 9/30/2008 |
| 631-576 | Patchogue | N/A |
| 631-577 | Farmingdale | N/A |
| 631-578 | Yaphank | 4/26/2007 |
| 631-579 | Brentwood | 11/14/2008 |
| 631-580 | Ronkonkoma | N/A |
| 631-581 | Islip | N/A |
| 631-582 | Central Islip | N/A |
| 631-583 | Fire Island | N/A |
| 631-584 | St James | N/A |
| 631-585 | Ronkonkoma | N/A |
| 631-586 | Deer Park | N/A |
| 631-587 | Babylon | N/A |
| 631-588 | Ronkonkoma | N/A |
| 631-589 | Sayville | N/A |
| 631-590 | Ronkonkoma | N/A |
| 631-591 | Riverhead | N/A |
| 631-592 | Lindenhst | N/A |
| 631-593 | Greenport | N/A |
| 631-594 | Hampton Bays | 3/15/2001 |
| 631-595 | Deer Park | N/A |
| 631-596 | Quogue | 1/13/2006 |
| 631-597 | East Fire Island | N/A |
| 631-598 | Amityville | N/A |
| 631-599 | Riverhead | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 631-600 | West Commack | N/A |
| 631-601 | Brentwood | 11/29/2012 |
| 631-602 | Shelter Island | 2/3/2006 |
| 631-603 | Riverhead | N/A |
| 631-604 | East Hampton | 1/11/2006 |
| 631-605 | Patchogue | 5/13/2009 |
| 631-606 | Northport | 4/17/2009 |
| 631-607 | Wading River | 9/6/2018 |
| 631-608 | Amityville | N/A |
| 631-609 | Brentwood | 9/8/2008 |
| 631-610 | Eastport | N/A |
| 631-612 | Babylon | N/A |
| 631-613 | Bridgehampton | N/A |
| 631-614 | Southampton | N/A |
| 631-615 | Ronkonkoma | N/A |
| 631-616 | Peconic | 1/13/2006 |
| 631-617 | Brentwood | 8/21/2006 |
| 631-618 | Yaphank | N/A |
| 631-619 | Ronkonkoma | N/A |
| 631-620 | Babylon | 6/22/2011 |
| 631-621 | St James | N/A |
| 631-622 | Farmingdale | N/A |
| 631-623 | West Commack | N/A |
| 631-624 | Brentwood | 6/30/2008 |
| 631-625 | Orient | 2/3/2006 |
| 631-626 | Brentwood | 5/12/2008 |
| 631-627 | Patchogue | 11/3/2005 |
| 631-628 | Northport | N/A |
| 631-629 | Huntington | 10/31/2007 |
| 631-630 | Central Islip | N/A |
| 631-631 | Fire Island | 10/11/2022 |
| 631-632 | Stony Brook | N/A |
| 631-633 | Bellport | 3/3/2014 |
| 631-634 | Commack | 10/9/2019 |
| 631-635 | Babylon | N/A |
| 631-636 | Brentwood | 12/15/2014 |
| 631-637 | Brentwood | 4/28/2014 |
| 631-638 | Stony Brook | 10/5/2005 |
| 631-639 | Brentwood | N/A |
| 631-640 | Amityville | 3/28/2017 |
| 631-641 | Water Mill | N/A |
| 631-642 | Port Jefferson | N/A |
| 631-643 | Midland | N/A |
| 631-644 | Riverhead | 10/14/2014 |
| 631-645 | Brentwood | N/A |
| 631-646 | Sayville | 5/28/2020 |
| 631-647 | Bay Shore | N/A |
| 631-648 | Ronkonkoma | N/A |
| 631-649 | Babylon | N/A |
| 631-650 | Islip | N/A |
| 631-651 | Northport | N/A |
| 631-652 | Smithtown | 1/13/2014 |
| 631-653 | Quogue | N/A |
| 631-654 | Patchogue | N/A |
| 631-655 | Riverhead | N/A |
| 631-656 | Smithtown | N/A |
| 631-657 | Atlantic | N/A |
| 631-658 | East Hampton | 7/11/2013 |
| 631-659 | Cold Spring Harbor | N/A |
| 631-660 | Riverhead | N/A |
| 631-661 | Babylon | N/A |
| 631-662 | Huntington | 10/25/2002 |
| 631-663 | Kings Park | N/A |
| 631-664 | Central Islip | N/A |
| 631-665 | Bay Shore | N/A |
| 631-666 | Bay Shore | N/A |
| 631-667 | Deer Park | N/A |
| 631-668 | Montauk Point | N/A |
| 631-669 | Babylon | N/A |
| 631-670 | Commack | N/A |
| 631-671 | Lindenhst | 6/17/2002 |
| 631-672 | Smithtown | 6/17/2002 |
| 631-673 | Huntington | N/A |
| 631-674 | Midland | N/A |
| 631-675 | Stony Brook | N/A |
| 631-676 | Ronkonkoma | 8/20/2004 |
| 631-677 | Sayville | N/A |
| 631-678 | Brentwood | N/A |
| 631-679 | Nassau Zone 09 | N/A |
| 631-680 | Riverhead | 2/14/2001 |
| 631-681 | Selden | 11/8/2004 |
| 631-682 | Selden | 3/14/2002 |
| 631-683 | Huntington | N/A |
| 631-684 | Westhampton | 6/23/2001 |
| 631-685 | Hampton Bays | N/A |
| 631-686 | St James | N/A |
| 631-687 | Patchogue | N/A |
| 631-688 | Farmingdale | N/A |
| 631-689 | Stony Brook | N/A |
| 631-690 | Patchogue | 10/15/2018 |
| 631-691 | Amityville | N/A |
| 631-692 | Cold Spring Harbor | N/A |
| 631-693 | Amityville | N/A |
| 631-694 | Farmingdale | N/A |
| 631-695 | Brentwood | N/A |
| 631-696 | Selden | N/A |
| 631-697 | Huntington | 1/16/2002 |
| 631-698 | Selden | N/A |
| 631-699 | Sayville | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 631-701 | Eastport | N/A |
| 631-702 | Southampton | N/A |
| 631-703 | Amityville | 8/8/2005 |
| 631-704 | Brentwood | 8/16/2005 |
| 631-705 | Atlantic | 2/16/2016 |
| 631-706 | Stony Brook | N/A |
| 631-707 | Brentwood | 3/10/2005 |
| 631-708 | Brentwood | N/A |
| 631-709 | Water Mill | 8/17/2004 |
| 631-710 | Ronkonkoma | 6/6/2018 |
| 631-712 | Farmingdale | N/A |
| 631-713 | Eastport | N/A |
| 631-714 | Patchogue | 10/11/2004 |
| 631-715 | Central Islip | N/A |
| 631-716 | Selden | N/A |
| 631-717 | Bayport | 4/29/2021 |
| 631-718 | Sag Harbor | 04/24/2024 |
| 631-719 | Farmingdale | N/A |
| 631-720 | Brentwood | 5/14/2020 |
| 631-721 | Selden | N/A |
| 631-722 | Jamesport | N/A |
| 631-723 | Hampton Bays | N/A |
| 631-724 | Smithtown | N/A |
| 631-725 | Sag Harbor | N/A |
| 631-726 | Water Mill | N/A |
| 631-727 | Riverhead | N/A |
| 631-728 | Hampton Bays | N/A |
| 631-729 | Atlantic | N/A |
| 631-730 | Patchogue | N/A |
| 631-731 | Amagansett | N/A |
| 631-732 | Selden | N/A |
| 631-733 | Brentwood | N/A |
| 631-734 | Peconic | N/A |
| 631-735 | Peconic | 4/3/2013 |
| 631-736 | Selden | N/A |
| 631-737 | Ronkonkoma | N/A |
| 631-738 | Ronkonkoma | N/A |
| 631-739 | Ronkonkoma | N/A |
| 631-740 | Riverhead | N/A |
| 631-741 | Brentwood | 10/9/2002 |
| 631-742 | Huntington | 10/9/2002 |
| 631-743 | Port Jefferson | 7/11/2013 |
| 631-744 | Shoreham | N/A |
| 631-745 | Riverhead | 2/21/2002 |
| 631-746 | Amityville | 9/30/2014 |
| 631-747 | Brentwood | 3/10/2005 |
| 631-748 | Brentwood | N/A |
| 631-749 | Shelter Island | N/A |
| 631-750 | Sayville | N/A |
| 631-751 | Stony Brook | N/A |
| 631-752 | Farmingdale | N/A |
| 631-753 | Farmingdale | N/A |
| 631-754 | Northport | N/A |
| 631-755 | Farmingdale | N/A |
| 631-756 | Farmingdale | N/A |
| 631-757 | Northport | N/A |
| 631-758 | Patchogue | N/A |
| 631-759 | Huntington | N/A |
| 631-760 | Huntington | N/A |
| 631-761 | Central Islip | N/A |
| 631-762 | Stony Brook | N/A |
| 631-763 | Cold Spring Harbor | N/A |
| 631-764 | Selden | 4/12/2001 |
| 631-765 | Southold | N/A |
| 631-766 | Brentwood | 7/6/2001 |
| 631-767 | Brentwood | 4/9/2002 |
| 631-768 | Farmingdale | N/A |
| 631-769 | Shoreham | N/A |
| 631-770 | Farmingdale | N/A |
| 631-771 | East Hampton | 10/13/2004 |
| 631-772 | Atlantic | N/A |
| 631-773 | Farmingdale | N/A |
| 631-774 | Brentwood | N/A |
| 631-775 | Yaphank | N/A |
| 631-776 | Bellport | N/A |
| 631-777 | Farmingdale | N/A |
| 631-778 | Central Islip | N/A |
| 631-779 | Jamesport | N/A |
| 631-780 | Smithtown | N/A |
| 631-781 | Nassau Zone 09 | N/A |
| 631-782 | Deer Park | N/A |
| 631-783 | Nassau Zone 09 | N/A |
| 631-784 | Central Islip | N/A |
| 631-785 | Nassau Zone 09 | N/A |
| 631-786 | Brentwood | 1/16/2001 |
| 631-787 | Central Islip | N/A |
| 631-788 | Fishers Is | N/A |
| 631-789 | Amityville | N/A |
| 631-790 | Patchogue | 5/16/2001 |
| 631-791 | Port Jefferson | N/A |
| 631-792 | Babylon | N/A |
| 631-793 | Brentwood | 3/15/2002 |
| 631-794 | Farmingdale | N/A |
| 631-795 | Nassau Zone 09 | N/A |
| 631-796 | Brentwood | 4/12/2001 |
| 631-797 | Nassau Zone 09 | N/A |
| 631-798 | Nassau Zone 09 | N/A |
| 631-799 | Nassau Zone 09 | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 631-800 | Southampton | N/A |
| 631-801 | Eastport | N/A |
| 631-802 | Port Jefferson | N/A |
| 631-803 | Bellport | N/A |
| 631-804 | Brentwood | 5/4/2001 |
| 631-805 | Amityville | 5/16/2001 |
| 631-806 | Brentwood | 10/5/2001 |
| 631-807 | Brentwood | 4/18/2002 |
| 631-808 | Sag Harbor | N/A |
| 631-809 | Deer Park | 7/12/2018 |
| 631-810 | Lindenhst | 12/16/2020 |
| 631-812 | Huntington | 5/9/2001 |
| 631-813 | Brentwood | 10/15/2004 |
| 631-814 | Babylon | 10/10/2022 |
| 631-815 | Farmingdale | N/A |
| 631-816 | Yaphank | 9/19/2002 |
| 631-817 | Fire Island | N/A |
| 631-818 | Babylon | 10/30/2018 |
| 631-819 | Bay Shore | 9/16/2019 |
| 631-820 | Ronkonkoma | N/A |
| 631-821 | Shoreham | N/A |
| 631-822 | Central Islip | N/A |
| 631-823 | Bayport | N/A |
| 631-824 | Huntington | N/A |
| 631-825 | Montauk Point | 8/1/2014 |
| 631-826 | Nassau Zone 09 | N/A |
| 631-827 | Huntington | 5/16/2002 |
| 631-828 | Port Jefferson | N/A |
| 631-829 | Amityville | 9/8/2015 |
| 631-830 | Riverhead | N/A |
| 631-831 | Brentwood | N/A |
| 631-832 | Bayport | N/A |
| 631-833 | Riverhead | 9/6/2002 |
| 631-834 | Brentwood | N/A |
| 631-835 | Brentwood | 6/4/2001 |
| 631-836 | Brentwood | 6/14/2001 |
| 631-837 | Northport | N/A |
| 631-838 | Brentwood | N/A |
| 631-839 | Brentwood | 1/16/2001 |
| 631-840 | Islip | N/A |
| 631-841 | Amityville | N/A |
| 631-842 | Amityville | N/A |
| 631-843 | Farmingdale | N/A |
| 631-844 | Farmingdale | N/A |
| 631-845 | Farmingdale | N/A |
| 631-846 | Selden | 1/16/2001 |
| 631-847 | Farmingdale | N/A |
| 631-848 | Brentwood | 6/24/2002 |
| 631-849 | Shoreham | N/A |
| 631-850 | West Commack | N/A |
| 631-851 | Central Islip | N/A |
| 631-852 | Riverhead | N/A |
| 631-853 | Central Islip | N/A |
| 631-854 | Brentwood | N/A |
| 631-855 | Deer Park | N/A |
| 631-856 | Hampton Bays | N/A |
| 631-857 | Cold Spring Harbor | N/A |
| 631-858 | West Commack | N/A |
| 631-859 | Islip | N/A |
| 631-860 | Deer Park | N/A |
| 631-861 | Farmingdale | N/A |
| 631-862 | St James | N/A |
| 631-863 | Smithtown | N/A |
| 631-864 | Commack | N/A |
| 631-865 | Deer Park | N/A |
| 631-866 | Bellport | N/A |
| 631-867 | Lindenhst | N/A |
| 631-868 | Bayport | N/A |
| 631-869 | Bellport | N/A |
| 631-870 | Central Islip | N/A |
| 631-871 | Riverhead | 3/15/2002 |
| 631-872 | Brentwood | 6/27/2001 |
| 631-873 | Brentwood | 10/14/2004 |
| 631-874 | Center Moriches | N/A |
| 631-875 | Riverhead | 7/18/2001 |
| 631-876 | Southold | 8/17/2004 |
| 631-877 | Brentwood | 8/2/2001 |
| 631-878 | Center Moriches | N/A |
| 631-879 | Patchogue | N/A |
| 631-880 | Selden | 11/8/2004 |
| 631-881 | Central Islip | N/A |
| 631-882 | Central Islip | 5/16/2001 |
| 631-883 | Bayport | N/A |
| 631-884 | Lindenhst | N/A |
| 631-885 | Brentwood | 10/27/2004 |
| 631-886 | Wading River | N/A |
| 631-887 | Hampton Bays | 10/10/2001 |
| 631-888 | Lindenhst | N/A |
| 631-889 | Deer Park | 4/15/2002 |
| 631-890 | Patchogue | N/A |
| 631-891 | Patchogue | 5/24/2004 |
| 631-892 | Bay Shore | N/A |
| 631-893 | Babylon | N/A |
| 631-894 | Bay Shore | N/A |
| 631-895 | Quogue | 9/24/2020 |
| 631-896 | Northport | 6/17/2002 |
| 631-897 | Huntington | 10/3/2001 |
| 631-898 | Westhampton | N/A |
| 631-899 | Sag Harbor | N/A |
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 631-900 | West Commack | N/A |
| 631-901 | Brentwood | 4/4/2005 |
| 631-902 | Riverhead | 10/9/2002 |
| 631-903 | Southampton | 10/9/2002 |
| 631-904 | Central Islip | N/A |
| 631-905 | Riverhead | N/A |
| 631-906 | Deer Park | 9/13/2019 |
| 631-907 | East Hampton | N/A |
| 631-908 | Patchogue | 3/9/2020 |
| 631-909 | Center Moriches | N/A |
| 631-910 | Wading River | N/A |
| 631-912 | Northport | N/A |
| 631-913 | Ronkonkoma | N/A |
| 631-914 | Riverhead | 11/25/2024 |
| 631-915 | Riverhead | N/A |
| 631-916 | Shoreham | 2/2/2021 |
| 631-918 | Deer Park | N/A |
| 631-919 | Sag Harbor | N/A |
| 631-920 | Midland | N/A |
| 631-921 | Brentwood | 10/5/2001 |
| 631-922 | Brentwood | N/A |
| 631-923 | Huntington | N/A |
| 631-924 | Yaphank | N/A |
| 631-925 | Northport | N/A |
| 631-926 | Brentwood | 9/25/2002 |
| 631-927 | Farmingdale | N/A |
| 631-928 | Port Jefferson | N/A |
| 631-929 | Wading River | N/A |
| 631-930 | Central Islip | N/A |
| 631-931 | East Hampton | 6/3/2016 |
| 631-932 | Deer Park | 4/1/2005 |
| 631-933 | Amityville | 1/23/2015 |
| 631-935 | Huntington | N/A |
| 631-937 | Southold | 7/16/2015 |
| 631-938 | Port Jefferson | 4/8/2005 |
| 631-939 | Riverhead | 4/24/2019 |
| 631-940 | Deer Park | N/A |
| 631-941 | Stony Brook | N/A |
| 631-942 | Brentwood | 8/22/2005 |
| 631-943 | Babylon | 5/16/2001 |
| 631-944 | Huntington | N/A |
| 631-945 | Greenport | 1/27/2021 |
| 631-946 | Selden | 9/7/2005 |
| 631-947 | Bellport | N/A |
| 631-948 | Brentwood | N/A |
| 631-949 | Bellport | 5/16/2001 |
| 631-951 | Brentwood | N/A |
| 631-952 | Brentwood | N/A |
| 631-953 | Riverhead | N/A |
| 631-954 | Bay Shore | N/A |
| 631-955 | Deer Park | N/A |
| 631-956 | Lindenhst | N/A |
| 631-957 | Lindenhst | N/A |
| 631-960 | Islip | N/A |
| 631-961 | Babylon | N/A |
| 631-962 | Farmingdale | N/A |
| 631-963 | Central Islip | N/A |
| 631-964 | Deer Park | N/A |
| 631-965 | Riverhead | 9/19/2002 |
| 631-966 | Brentwood | 7/8/2020 |
| 631-967 | Brentwood | N/A |
| 631-968 | Bay Shore | N/A |
| 631-969 | Bay Shore | N/A |
| 631-970 | Mattituck | 1/27/2021 |
| 631-971 | West Commack | N/A |
| 631-972 | Brentwood | 9/15/2005 |
| 631-973 | Kings Park | N/A |
| 631-974 | Smithtown | 4/4/2001 |
| 631-975 | Center Moriches | 2/15/2016 |
| 631-977 | Patchogue | 2/9/2016 |
| 631-978 | Port Jefferson | N/A |
| 631-979 | Smithtown | N/A |
| 631-980 | Commack | N/A |
| 631-981 | Ronkonkoma | N/A |
| 631-982 | Smithtown | N/A |
| 631-983 | Babylon | N/A |
| 631-984 | Deer Park | 3/26/2020 |
| 631-985 | Riverhead | 1/27/2021 |
| 631-986 | Smithtown | 1/27/2021 |
| 631-987 | Brentwood | N/A |
| 631-988 | Huntington | 2/14/2001 |
| 631-989 | Riverhead | N/A |
| 631-990 | Bay Shore | 9/30/2019 |
| 631-991 | Lindenhst | N/A |
| 631-992 | Deer Park | 9/16/2013 |
| 631-993 | Commack | N/A |
| 631-994 | Brentwood | 8/25/2014 |
| 631-995 | Yaphank | N/A |
| 631-996 | Quogue | N/A |
| 631-997 | Selden | 7/29/2014 |
| 631-998 | Westhampton | N/A |
| 631-999 | Jamesport | 02/20/2024 |
- For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
- Assignment date. N/A - mostly central office codes assigned before 2001.
- NXX prefixes last updated: March 1st, 2025
Cities in area code 631
| City1 | County | Time Zone2 |
|---|---|---|
| Amagansett | Suffolk | E |
| Amityville | Suffolk | E |
| Aquebogue | Suffolk | E |
| Babylon | Suffolk | E |
| Bay Shore | Suffolk | E |
| Bayport | Suffolk | E |
| Bellport | Suffolk | E |
| Blue Point | Suffolk | E |
| Bohemia | Suffolk | E |
| Brentwood | Suffolk | E |
| Bridgehampton | Suffolk | E |
| Brightwaters | Suffolk | E |
| Brookhaven | Suffolk | E |
| Calverton | Suffolk | E |
| Center Moriches | Suffolk | E |
| Centereach | Suffolk | E |
| Centerport | Suffolk | E |
| Central Islip | Suffolk | E |
| Cold Spring Harbor | Suffolk | E |
| Commack | Suffolk | E |
| Copiague | Suffolk | E |
| Coram | Suffolk | E |
| Cutchogue | Suffolk | E |
| Deer Park | Suffolk | E |
| East Hampton | Suffolk | E |
| East Islip | Suffolk | E |
| East Marion | Suffolk | E |
| East Moriches | Suffolk | E |
| East Northport | Suffolk | E |
| East Quogue | Suffolk | E |
| East Setauket | Suffolk | E |
| Eastport | Suffolk | E |
| Farmingville | Suffolk | E |
| Fishers Island | Suffolk | E |
| Great River | Suffolk | E |
| Greenlawn | Suffolk | E |
| Greenport | Suffolk | E |
| Hampton Bays | Suffolk | E |
| Hauppauge | Suffolk | E |
| Holbrook | Suffolk | E |
| Holtsville | Suffolk | E |
| Huntington | Suffolk | E |
| Huntington Station | Suffolk | E |
| Islandia | Suffolk | E |
| Islip | Suffolk | E |
| Islip Terrace | Suffolk | E |
| Jamesport | Suffolk | E |
| Kings Park | Suffolk | E |
| Lake Grove | Suffolk | E |
| Laurel | Suffolk | E |
| Lindenhurst | Suffolk | E |
| Manorville | Suffolk | E |
| Mastic | Suffolk | E |
| Mastic Beach | Suffolk | E |
| Mattituck | Suffolk | E |
| Medford | Suffolk | E |
| Melville | Suffolk | E |
| Middle Island | Suffolk | E |
| Miller Place | Suffolk | E |
| Montauk | Suffolk | E |
| Moriches | Suffolk | E |
| Mount Sinai | Suffolk | E |
| Nesconset | Suffolk | E |
| New Suffolk | Suffolk | E |
| North Babylon | Suffolk | E |
| Northport | Suffolk | E |
| Oakdale | Suffolk | E |
| Ocean Beach | Suffolk | E |
| Orient | Suffolk | E |
| Patchogue | Suffolk | E |
| Peconic | Suffolk | E |
| Port Jefferson | Suffolk | E |
| Port Jefferson Station | Suffolk | E |
| Quogue | Suffolk | E |
| Remsenburg | Suffolk | E |
| Ridge | Suffolk | E |
| Riverhead | Suffolk | E |
| Rocky Point | Suffolk | E |
| Ronkonkoma | Suffolk | E |
| Sag Harbor | Suffolk | E |
| Sagaponack | Suffolk | E |
| Sayville | Suffolk | E |
| Selden | Suffolk | E |
| Shelter Island | Suffolk | E |
| Shelter Island Heights | Suffolk | E |
| Shirley | Suffolk | E |
| Shoreham | Suffolk | E |
| Smithtown | Suffolk | E |
| Sound Beach | Suffolk | E |
| South Jamesport | Suffolk | E |
| Southampton | Suffolk | E |
| Southold | Suffolk | E |
| Speonk | Suffolk | E |
| St James | Suffolk | E |
| Stony Brook | Suffolk | E |
| Upton | Suffolk | E |
| Wading River | Suffolk | E |
| Wainscott | Suffolk | E |
| Water Mill | Suffolk | E |
| West Babylon | Suffolk | E |
| West Islip | Suffolk | E |
| West Sayville | Suffolk | E |
| Westhampton | Suffolk | E |
| Westhampton Beach | Suffolk | E |
| Wyandanch | Suffolk | E |
| Yaphank | Suffolk | E |
- Listed above are most places served by USA area code 631. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
- E stands for Eastern Time (currently ).