| 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 |
|---|---|---|---|
| 631-513 | Brentwood | Suffolk | Landline |
| 631-717 | East Hampton | Suffolk | Landline |
| 631-480 | Amityville | Suffolk | Landline |
| 631-443 | Eastport | Suffolk | Landline |
| 631-298 | Mattituck | Suffolk | Landline |
| 631-949 | Bellport | Suffolk | Wireless |
| 631-220 | Brentwood | Suffolk | Wireless |
| 631-536 | Eastport | Suffolk | Landline |
| 631-418 | Huntington | Suffolk | Landline |
| 631-349 | East Setauket | Suffolk | Wireless |
| 631-357 | Brentwood | Suffolk | Landline |
| 631-587 | West Babylon | Suffolk | Landline |
| 631-246 | Stony Brook | Suffolk | Landline |
| 631-683 | Huntington | Suffolk | Landline |
| 631-343 | Commack | Suffolk | Landline |
| 631-340 | West Babylon | Suffolk | Wireless |
| 631-392 | North Babylon | Suffolk | Landline |
| 631-907 | Sag Harbor | Suffolk | Landline |
| 631-921 | Brentwood | Suffolk | Wireless |
| 631-801 | Eastport | Suffolk | Landline |