| 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 |
|---|---|---|---|
| 631-657 | Mastic | Suffolk | Landline |
| 631-739 | Islandia | Suffolk | Landline |
| 631-837 | Northport | Suffolk | Landline |
| 631-520 | Amityville | Suffolk | Landline |
| 631-528 | Kings Park | Suffolk | Landline |
| 631-699 | Sayville | Suffolk | Landline |
| 631-478 | Brentwood | Suffolk | Landline |
| 631-442 | Brentwood | Suffolk | Wireless |
| 631-586 | North Babylon | Suffolk | Landline |
| 631-412 | Lindenhurst | Suffolk | Landline |
| 631-610 | Eastport | Suffolk | Landline |
| 631-571 | Orient | Suffolk | Landline |
| 631-616 | Peconic | Suffolk | Landline |
| 631-491 | North Babylon | Suffolk | Landline |
| 631-526 | West Babylon | Suffolk | Landline |
| 631-465 | Farmingdale | Nassau | Landline |
| 631-533 | Islandia | Suffolk | Landline |
| 631-691 | Amityville | Suffolk | Landline |
| 631-432 | Brentwood | Suffolk | Landline |
| 631-944 | Huntington | Suffolk | Landline |