631 Area Code — New York
631 is a North American Numbering Plan area code for New York, the United States. It covers about 1,477,834 people in 108 towns and 116 ZIP codes, including Bay Shore, Huntington Station and Patchogue.
| Field | Value |
|---|---|
| Area code | 631 |
| Country | United States (+1) |
| State / province | New York |
| Type | Shares its towns with 934 |
| Time zone | Eastern |
| Population covered | 1,477,834 |
| Towns covered | 108 |
| ZIP codes | 116 |
| Approx. centre | 40.857, -72.931 |
Where area code 631 is used
Area code 631 is assigned to New York, the United States, inside the North American Numbering Plan. Numbers in the code are written (631) NXX-XXXX at home and +1 631 NXX-XXXX when dialled from outside Canada and the United States. Since the NANP moved to 10-digit dialling you must always include the area code, even for a local call.
Other area codes in this footprint: 934. They serve towns in the same territory, so a single street can contain numbers from more than one code. That is normal in the NANP and does not change how you dial.
Towns and cities in area code 631
The 108 towns below are the largest in the 631 footprint, ranked by population. Every one of them links to its own page with the full list of area codes and ZIP codes for that town.
| Town | County | Population | ZIP codes |
|---|---|---|---|
| Bay Shore | Suffolk County | 68,976 | 1 |
| Huntington Station | Suffolk County | 65,747 | 1 |
| Patchogue | Suffolk County | 45,023 | 1 |
| Lindenhurst | Suffolk County | 44,413 | 1 |
| Huntington | Suffolk County | 43,490 | 1 |
| West Babylon | Suffolk County | 40,706 | 2 |
| Central Islip | Suffolk County | 39,033 | 1 |
| Ronkonkoma | Suffolk County | 38,206 | 1 |
| Smithtown | Suffolk County | 34,499 | 1 |
| Riverhead | Suffolk County | 33,091 | 1 |
| Farmingdale | Suffolk County | 32,028 | 2 |
| East Northport | Suffolk County | 29,999 | 1 |
Counties covered
| County | ZIP codes |
|---|---|
| Suffolk County | 114 |
| Nassau County | 2 |
Other area codes serving the same towns
Nearby area codes
How to dial area code 631
- Within North America: 631 + 7-digit number (631-NXX-XXXX). The leading 1 is optional on a mobile phone and required on most landlines for long-distance.
- From abroad: your country's international prefix, then 1, then 631, then the 7-digit number — for example 00 1 631 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 631?
631 is a North American Numbering Plan area code assigned to New York, the United States. It covers about 1,477,834 people in 108 towns.
Is 631 a US or Canadian area code?
631 is a United States area code. Canada and the United States share the +1 country code, so both are part of the same numbering plan.
What time zone is area code 631 in?
Area code 631 is in the Eastern time zone.
Do I have to dial 10 digits?
Yes. Every NANP call now requires the area code plus the seven-digit number, even for a local call.