631 area code is the telephone area code of the North American Numbering Plan (NANP) for Suffolk County in southeastern New York, United States. The area code was created in 1999.
| Area Code | 631 |
|---|---|
| Major City | Brentwood |
| Service Date | 11/01/1999 |
| Time Zone | Eastern |
| Overlay Complex | 631/934 |
| Location | New York (NY) |
| Country | United States |
Some of the cities served by the 631 area code include Brentwood, West Babylon, Coram, Commack, Central Islip, Huntington Station, Centereach, West Islip, Shirley and more.
| Area code | City/Town | County |
|---|---|---|
| 631 | Amagansett | Suffolk |
| 631 | Amityville | Suffolk |
| 631 | Aquebogue | Suffolk |
| 631 | Babylon | Suffolk |
| 631 | Bay Shore | Suffolk |
| 631 | Bayport | Suffolk |
| 631 | Bellport | Suffolk |
| 631 | Blue Point | Suffolk |
| 631 | Bohemia | Suffolk |
| 631 | Brentwood | Suffolk |
| 631 | Bridgehampton | Suffolk |
| 631 | Brightwaters | Suffolk |
| 631 | Brookhaven | Suffolk |
| 631 | Calverton | Suffolk |
| 631 | Center Moriches | Suffolk |
| 631 | Centereach | Suffolk |
| 631 | Centerport | Suffolk |
| 631 | Central Islip | Suffolk |
| 631 | Cold Spring Harbor | Suffolk |
| 631 | Commack | Suffolk |
| 631 | Copiague | Suffolk |
| 631 | Coram | Suffolk |
| 631 | Cutchogue | Suffolk |
| 631 | Deer Park | Suffolk |
| 631 | East Hampton | Suffolk |
| 631 | East Islip | Suffolk |
| 631 | East Marion | Suffolk |
| 631 | East Moriches | Suffolk |
| 631 | East Northport | Suffolk |
| 631 | East Quogue | Suffolk |
| 631 | East Setauket | Suffolk |
| 631 | Eastport | Suffolk |
| 631 | Farmingville | Suffolk |
| 631 | Fishers Island | Suffolk |
| 631 | Great River | Suffolk |
| 631 | Greenlawn | Suffolk |
| 631 | Greenport | Suffolk |
| 631 | Hampton Bays | Suffolk |
| 631 | Hauppauge | Suffolk |
| 631 | Holbrook | Suffolk |
| 631 | Holtsville | Suffolk |
| 631 | Huntington | Suffolk |
| 631 | Huntington Station | Suffolk |
| 631 | Islandia | Suffolk |
| 631 | Islip | Suffolk |
| 631 | Islip Terrace | Suffolk |
| 631 | Jamesport | Suffolk |
| 631 | Kings Park | Suffolk |
| 631 | Lake Grove | Suffolk |
| 631 | Laurel | Suffolk |
| 631 | Lindenhurst | Suffolk |
| 631 | Manorville | Suffolk |
| 631 | Mastic | Suffolk |
| 631 | Mastic Beach | Suffolk |
| 631 | Mattituck | Suffolk |
| 631 | Medford | Suffolk |
| 631 | Melville | Suffolk |
| 631 | Middle Island | Suffolk |
| 631 | Miller Place | Suffolk |
| 631 | Montauk | Suffolk |
| 631 | Moriches | Suffolk |
| 631 | Mount Sinai | Suffolk |
| 631 | Nesconset | Suffolk |
| 631 | New Suffolk | Suffolk |
| 631 | North Babylon | Suffolk |
| 631 | Northport | Suffolk |
| 631 | Oakdale | Suffolk |
| 631 | Ocean Beach | Suffolk |
| 631 | Orient | Suffolk |
| 631 | Patchogue | Suffolk |
| 631 | Peconic | Suffolk |
| 631 | Port Jefferson | Suffolk |
| 631 | Port Jefferson Station | Suffolk |
| 631 | Quogue | Suffolk |
| 631 | Remsenburg | Suffolk |
| 631 | Ridge | Suffolk |
| 631 | Riverhead | Suffolk |
| 631 | Rocky Point | Suffolk |
| 631 | Ronkonkoma | Suffolk |
| 631 | Sag Harbor | Suffolk |
| 631 | Sagaponack | Suffolk |
| 631 | Sayville | Suffolk |
| 631 | Selden | Suffolk |
| 631 | Shelter Island | Suffolk |
| 631 | Shelter Island Heights | Suffolk |
| 631 | Shirley | Suffolk |
| 631 | Shoreham | Suffolk |
| 631 | Smithtown | Suffolk |
| 631 | Sound Beach | Suffolk |
| 631 | South Jamesport | Suffolk |
| 631 | Southampton | Suffolk |
| 631 | Southold | Suffolk |
| 631 | Speonk | Suffolk |
| 631 | St James | Suffolk |
| 631 | Stony Brook | Suffolk |
| 631 | Upton | Suffolk |
| 631 | Wading River | Suffolk |
| 631 | Wainscott | Suffolk |
| 631 | Water Mill | Suffolk |
| 631 | West Babylon | Suffolk |
| 631 | West Islip | Suffolk |
| 631 | West Sayville | Suffolk |
| 631 | Westhampton | Suffolk |
| 631 | Westhampton Beach | Suffolk |
| 631 | Wyandanch | Suffolk |
| 631 | Yaphank | Suffolk |