Where Is Area Code 631?
Area code 631 serves Suffolk County on eastern Long Island in New York. The area is part of the U.S. Mid-Atlantic region, and Babylon is the primary city associated with the code.
The area includes communities such as Amityville, Patchogue, Hauppauge, Ronkonkoma, Riverhead, Southampton, East Hampton, and Montauk. It covers the North Fork and South Fork of Long Island, as well as Fire Island, Great South Bay, Long Island Sound, and Montauk Point.
Suffolk County contains several notable landmarks and institutions. These include Fire Island National Seashore, Stony Brook University, Brookhaven National Laboratory, and Long Island MacArthur Airport.
Cities and Communities in the 631 Area Code
- Babylon, Suffolk County
- Brookhaven, Suffolk County
- East Hampton, Suffolk County
- Huntington, Suffolk County
- Islip, Suffolk County
- Riverhead, Suffolk County
- Shelter Island, Suffolk County
- Smithtown, Suffolk County
- Southampton, Suffolk County
- Southold, Suffolk County
History of Area Code 631
Area code 631 was established on November 1, 1999, when it split from area code 516. The split assigned 631 to Suffolk County, while area code 516 continued to serve Nassau County.
Area code 631 was later overlaid by area code 934 in 2016. The overlay added a second area code to the same geographic region, allowing new telephone numbers to use 934 while existing 631 numbers remained in service. The split and later overlay reflected growing demand for telephone numbers across Long Island.
Key Facts About Area Code 631
- Area code 631 is in New York, and Babylon is its primary city.
- Area code 631 is a geographic area code serving Suffolk County on Long Island.
- Suffolk County is part of the U.S. Census Bureau’s Mid-Atlantic region.
- Suffolk County had 1,525,920 residents in the 2020 U.S. Census.
- Area code 631 began service in 1999 after splitting from area code 516.
- Area code 934 has overlaid area code 631 since 2016.
- Stony Brook University and Brookhaven National Laboratory are located within the 631 geographic area.
- Fire Island National Seashore, Montauk Point, and the North and South Forks are notable features in the area.
Frequently Asked Questions
What state is area code 631 in?
Area code 631 is in New York.
What major cities use area code 631?
Major communities associated with area code 631 include Babylon, Brookhaven, Huntington, Islip, Riverhead, Southampton, East Hampton, and Southold in Suffolk County.
What time zone is area code 631 in?
Area code 631 is in Eastern Time.
Is area code 631 a toll-free number?
No. Area code 631 is a geographic area code, not a toll-free number.