| 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 |
|---|---|---|---|
| 631-828 | East Setauket | Suffolk | Landline |
| 631-514 | Brentwood | Suffolk | Landline |
| 631-630 | Islandia | Suffolk | Landline |
| 631-654 | Patchogue | Suffolk | Landline |
| 631-620 | Plainview | Nassau | Landline |
| 631-403 | East Setauket | Suffolk | Landline |
| 631-941 | Stony Brook | Suffolk | Landline |
| 631-449 | Brentwood | Suffolk | Wireless |
| 631-896 | Northport | Suffolk | Wireless |
| 631-802 | East Setauket | Suffolk | Landline |
| 631-918 | Deer Park | Suffolk | Landline |
| 631-267 | Sag Harbor | Suffolk | Landline |
| 631-577 | Farmingdale | Nassau | Landline |
| 631-436 | Brentwood | Suffolk | Landline |
| 631-768 | Carle Place | Nassau | Landline |
| 631-559 | Brentwood | Suffolk | Wireless |
| 631-515 | East Marion | Suffolk | Landline |
| 631-285 | Islandia | Suffolk | Landline |
| 631-580 | Islandia | Suffolk | Landline |
| 631-463 | Islandia | Suffolk | Wireless |