| 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 |
|---|---|---|---|
| 631-424 | Huntington | Suffolk | Landline |
| 631-315 | Mattituck | Suffolk | Landline |
| 631-277 | Islip | Suffolk | Landline |
| 631-627 | Patchogue | Suffolk | Landline |
| 631-352 | Hauppauge | Suffolk | Wireless |
| 631-875 | Riverhead | Suffolk | Wireless |
| 631-836 | Brentwood | Suffolk | Wireless |
| 631-804 | Brentwood | Suffolk | Wireless |
| 631-337 | Sayville | Suffolk | Landline |
| 631-524 | Brentwood | Suffolk | Wireless |
| 631-546 | Huntington | Suffolk | Landline |
| 631-420 | Farmingdale | Nassau | Landline |
| 631-402 | Brentwood | Suffolk | Landline |
| 631-217 | East Setauket | Suffolk | Landline |
| 631-385 | Huntington | Suffolk | Landline |
| 631-452 | - | - | - |
| 631-425 | Huntington | Suffolk | Landline |
| 631-763 | Carle Place | Nassau | Landline |
| 631-970 | Suffolk | Suffolk | - |
| 631-715 | Islandia | Suffolk | Landline |