| 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 |
|---|---|---|---|
| 631-498 | Cold Spring Harbor | Suffolk | Landline |
| 631-419 | Sayville | Suffolk | Landline |
| 631-232 | Islandia | Suffolk | Landline |
| 631-466 | Riverhead | Suffolk | Landline |
| 631-544 | Kings Park | Suffolk | Landline |
| 631-327 | Huntington | Suffolk | Wireless |
| 631-551 | Saint James | Suffolk | Landline |
| 631-393 | Farmingdale | Nassau | Landline |
| 631-588 | Islandia | Suffolk | Landline |
| 631-786 | Brentwood | Suffolk | Wireless |
| 631-416 | Brentwood | Suffolk | Wireless |
| 631-532 | Amityville | Suffolk | Landline |
| 631-295 | Yaphank | Suffolk | Landline |
| 631-389 | Islandia | Suffolk | Landline |
| 631-682 | Selden | Suffolk | Wireless |
| 631-835 | Brentwood | Suffolk | Wireless |
| 631-792 | Huntington | Suffolk | Landline |
| 631-793 | Brentwood | Suffolk | Wireless |
| 631-453 | Selden | Suffolk | Wireless |
| 631-499 | Commack | Suffolk | Landline |