Area Code 631: Long Island (Suffolk), New York
631 is a telephone area code serving New York, including Long Island (Suffolk). It is part of the North American Numbering Plan and is dialed with the country code +1.
Numbers beginning with 631 are located in New York, United States (NANP region: Long Island). The code covers Long Island (Suffolk).
How to Dial Area Code 631
| Calling from | What to dial |
|---|---|
| Anywhere in the US or Canada | 1 631 XXX-XXXX (10-digit dialing: 631 + 7-digit number) |
| Local call inside the same area code | 7-digit number in most areas; 10 digits where an overlay code is active |
| From the UK or Europe | 00 1 631 XXX XXXX |
| From Australia | 0011 1 631 XXX XXXX |
| From a mobile phone anywhere | +1 631 XXX XXXX |
Whatever country you are calling from, the + symbol replaces the exit code. Save the contact as +1 631 XXXXXXX and it will dial correctly from any phone in the world.
Time Zone for Area Code 631
Calls to a 631 number ring in the America/New_York time zone, standard offset UTC-05:00. Daylight saving time applies here, so the offset moves forward one hour from March to November.
Cities and Communities Served by 631
The following places fall inside the 631 calling area:
Other Area Codes in New York
These codes also serve New York. Area codes are assigned by the North American Numbering Plan Administration (NANPA).
| Area Code | Cities / Coverage |
|---|---|
| 212 | Manhattan |
| 315 | Syracuse |
| 329 | Hudson Valley (overlay for 845) |
| 332 | Manhattan (overlay) |
| 347 | NYC outer boroughs (overlay) |
| 363 | Long Island - Nassau (overlay for 516) |
| 516 | Long Island (Nassau) |
| 518 | Albany |
| 585 | Rochester |
| 607 | Binghamton, Ithaca |
| 624 | Buffalo (overlay for 716) |
| 646 | Manhattan (overlay) |
| 680 | Syracuse (overlay for 315) |
| 716 | Buffalo |
See all 22 area codes in New York →
Frequently Asked Questions
Where is area code 631?
Area code 631 is in New York, United States. It covers Long Island (Suffolk).
What time zone is area code 631 in?
Area code 631 rings in the America/New_York time zone (UTC-05:00 standard).
Do I need to dial 1 before area code 631?
Yes, for a long-distance call inside the US and Canada you dial 1 first, then 631, then the seven-digit number. The 1 is the North American long-distance trunk prefix — it is not the country code. From outside North America you dial your exit code then 1 then 631.
Is area code 631 toll-free?
No. 631 is a standard geographic area code, so normal long-distance rates apply unless your plan includes them. Toll-free NANP codes are 800, 833, 844, 855, 866, 877 and 888.