Area Code 631 — New York
Covers Huntington, Babylon, Islip, Smithtown, and Brookhaven and surrounding areas in New York (NY).
Time zone: Eastern (ET) | Established: 1999
Where Is Area Code 631?
Area code 631 covers Suffolk County on eastern Long Island including Huntington, Babylon, and the Hamptons. Created in 1999 to handle growing demand for phone numbers, it serves approximately 1.5 million residents in the Eastern (ET) time zone.
Huntington is the largest city in the 631 area code and serves as the economic and cultural center of the region. Other notable communities include Babylon, Islip, and Smithtown, each contributing to the area’s mix of residential, commercial, and cultural activity. The region supports a diverse economy with opportunities in healthcare, education, retail, and various service industries.
New York is served by 19 area codes in total, reflecting the state’s population growth and demand for telephone numbers over the decades. Area code 631 was carved out in 1999 to address increasing number demand in the region, allowing each area to maintain a sufficient supply of available numbers.
Major Cities and Communities in the 631 Area Code
The following cities and communities are served by area code 631:
- Huntington
- Babylon
- Islip
- Smithtown
- Brookhaven
Area Code 631 Details
| State | New York (NY) |
| Time Zone | Eastern (ET) (UTC-5 / UTC-4 (DST)) |
| Year Established | 1999 |
| Overlay Code | No |
| Approximate Population Served | 1,500,000 |
| Region | Covers Suffolk County on eastern Long Island including Huntington, Babylon, and the Hamptons |
Interesting Facts About Area Code 631
- Area code 631 was created in 1999 when New York’s existing area codes could no longer meet the growing demand for new phone numbers in the region.
- Area code 631 serves approximately 1.5 million residents in New York, centered around the Huntington area.
- New York uses 19 area codes in total, reflecting its large population and the ongoing demand for telephone numbers.
Related Area Codes
Other New York area codes: 212, 315, 332, 347, 516, 518, 585, 607, 646, 680, 716, 718, 838, 845, 914, 917, 929, 934
Connecticut: 203, 860
Massachusetts: 413
New Jersey: 201, 973
Pennsylvania: 570, 717
Vermont: 802
Frequently Asked Questions
What cities use area code 631?
Area code 631 serves Huntington, Babylon, Islip, Smithtown, and Brookhaven and surrounding communities in New York.
What time zone is area code 631?
Area code 631 is in the Eastern (ET) time zone (UTC-5 / UTC-4 (DST)).
Is 631 a toll-free number?
No, area code 631 is not a toll-free number. It is a geographic area code assigned to New York. Toll-free area codes include 800, 888, 877, 866, 855, 844, and 833.
When was area code 631 established?
Area code 631 was established in 1999.
Other New York Area Codes
212 • 315 • 332 • 347 • 516 • 518 • 585 • 607 • 646 • 680 • 716 • 718 • 838 • 845 • 914 • 917 • 929 • 934
Learn more about New York: