| General Information about Area Code 631 | |
|---|---|
| Country | United States |
| State / Province / Territory | New York |
| Major City | Huntington |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 631-644 | Riverhead | Suffolk | Wireless |
| 631-289 | Patchogue | Suffolk | Landline |
| 631-266 | Commack | Suffolk | Landline |
| 631-568 | Amityville | Suffolk | Wireless |
| 631-451 | Selden | Suffolk | Landline |
| 631-276 | Hampton Bays | Suffolk | Wireless |
| 631-269 | Kings Park | Suffolk | Landline |
| 631-332 | Brentwood | Suffolk | Wireless |
| 631-776 | Bellport | Suffolk | Landline |
| 631-328 | Brightwaters | Suffolk | Landline |
| 631-738 | Islandia | Suffolk | Landline |
| 631-803 | Bellport | Suffolk | Landline |
| 631-765 | Southold | Suffolk | Landline |
| 631-797 | Massapequa | Nassau | Landline |
| 631-234 | Islandia | Suffolk | Landline |
| 631-613 | Sag Harbor | Suffolk | Landline |
| 631-922 | Brentwood | Suffolk | Wireless |
| 631-299 | Brentwood | Suffolk | Landline |
| 631-510 | Deer Park | Suffolk | Landline |
| 631-888 | Lindenhurst | Suffolk | Landline |