| 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 |
|---|---|---|---|
| 631-558 | Riverhead | Suffolk | Wireless |
| 631-752 | Farmingdale | Nassau | Landline |
| 631-359 | Wading River | Suffolk | Landline |
| 631-323 | Greenport | Suffolk | Landline |
| 631-996 | East Quogue | Suffolk | Landline |
| 631-564 | Sayville | Suffolk | Landline |
| 631-703 | Amityville | Suffolk | Wireless |
| 631-213 | Huntington | Suffolk | Landline |
| 631-864 | Commack | Suffolk | Landline |
| 631-509 | East Setauket | Suffolk | Landline |
| 631-226 | Lindenhurst | Suffolk | Landline |
| 631-507 | Amityville | Suffolk | Wireless |
| 631-601 | Brentwood | Suffolk | Wireless |
| 631-648 | Islandia | Suffolk | Landline |
| 631-581 | Islip | Suffolk | Landline |
| 631-661 | West Babylon | Suffolk | Landline |
| 631-239 | Northport | Suffolk | Landline |
| 631-678 | Brentwood | Suffolk | Landline |
| 631-629 | Huntington | Suffolk | Landline |
| 631-656 | Hauppauge | Suffolk | Landline |