| 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 |
|---|---|---|---|
| 631-756 | Farmingdale | Nassau | Landline |
| 631-477 | Greenport | Suffolk | Landline |
| 631-537 | Sag Harbor | Suffolk | Landline |
| 631-660 | Riverhead | Suffolk | Landline |
| 631-879 | Patchogue | Suffolk | Landline |
| 631-492 | North Babylon | Suffolk | Landline |
| 631-344 | Yaphank | Suffolk | Landline |
| 631-274 | North Babylon | Suffolk | Landline |
| 631-813 | Brentwood | Suffolk | Landline |
| 631-964 | North Babylon | Suffolk | Landline |
| 631-431 | Islandia | Suffolk | Wireless |
| 631-760 | Huntington | Suffolk | Landline |
| 631-727 | Riverhead | Suffolk | Landline |
| 631-604 | East Hampton | Suffolk | Landline |
| 631-341 | Yaphank | Suffolk | Landline |
| 631-649 | West Babylon | Suffolk | Landline |
| 631-868 | Blue Point | Suffolk | Landline |
| 631-857 | Cold Spring Harbor | Suffolk | Landline |
| 631-893 | West Babylon | Suffolk | Landline |
| 631-827 | Huntington | Suffolk | Wireless |