| 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 |
|---|---|---|---|
| 631-523 | Islandia | Suffolk | Wireless |
| 631-445 | Brentwood | Suffolk | Wireless |
| 631-209 | Shoreham | Suffolk | Landline |
| 631-603 | Riverhead | Suffolk | Landline |
| 631-380 | Huntington | Suffolk | Landline |
| 631-569 | Patchogue | Suffolk | Landline |
| 631-358 | West Babylon | Suffolk | Wireless |
| 631-799 | Massapequa | Nassau | Landline |
| 631-284 | Riverhead | Suffolk | Landline |
| 631-729 | Mastic | Suffolk | Landline |
| 631-974 | Hauppauge | Suffolk | Wireless |
| 631-369 | Riverhead | Suffolk | Landline |
| 631-306 | Brentwood | Suffolk | Landline |
| 631-370 | Farmingdale | Nassau | Landline |
| 631-521 | Brentwood | Suffolk | Landline |
| 631-602 | East Marion | Suffolk | Landline |
| 631-652 | Hauppauge | Suffolk | Landline |
| 631-450 | Lindenhurst | Suffolk | Wireless |
| 631-834 | Brentwood | Suffolk | Wireless |
| 631-898 | Westhampton | Suffolk | Landline |