| 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 |
|---|---|---|---|
| 631-487 | Brentwood | Suffolk | Wireless |
| 631-963 | Islandia | Suffolk | Landline |
| 631-979 | Hauppauge | Suffolk | Landline |
| 631-928 | Port Jefferson Station | Suffolk | Landline |
| 631-204 | Hampton Bays | Suffolk | Landline |
| 631-626 | Brentwood | Suffolk | Wireless |
| 631-336 | Brentwood | Suffolk | Wireless |
| 631-574 | Riverhead | Suffolk | Landline |
| 631-980 | Commack | Suffolk | Landline |
| 631-746 | Amityville | Suffolk | Wireless |
| 631-522 | North Babylon | Suffolk | Landline |
| 631-595 | North Babylon | Suffolk | Landline |
| 631-461 | Riverhead | Suffolk | Wireless |
| 631-713 | Eastport | Suffolk | Landline |
| 631-669 | West Babylon | Suffolk | Landline |
| 631-885 | Brentwood | Suffolk | Wireless |
| 631-444 | Stony Brook | Suffolk | Landline |
| 631-456 | Brentwood | Suffolk | Wireless |
| 631-618 | Yaphank | Suffolk | Landline |
| 631-283 | Hampton Bays | Suffolk | Landline |