Area code 631

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The blue area is New York State; the red area is area code 631.

Area code 631 is the telephone area code for Suffolk County, New York; it covers eastern and central parts of Long Island. 631 was created in 1999 as a split from area code 516. Population centers within 631 include Babylon, Brookhaven, Huntington, Patchogue, Smithtown, Shelter Island, and the Hamptons.

In 2016, Suffolk County will receive a second area code; it will be 934. The new 934 will overlay the current 631, the first overlay for New York state outside New York City. All calls from a (631) number will need the area code to reach another 10-digit number, including another with (631).

History of Suffolk County area codes[edit]

1947–1951: 914[edit]

Upon North American adoption of area codes in October 1947, Suffolk, Nassau, and the lower Hudson Valley were assigned the 914 area code.[1] As direct distance dialing had not been introduced in North America in 1951, the 914 area code was not actually used to reach Long Island.

1951–1999: 516[edit]

In 1951, the 516 area code was assigned to Nassau and Suffolk.[2]

1999–present: 631[edit]

On November 1, 1999, 516 was reduced to Nassau County, while 631 was created for Suffolk County. Permissive dialing of 516 across Long Island continued until the spring of 2000.[3]


According to the October 2014 NPA Exhaust Projection, area code 631 is expected to be exhausted in the third quarter of 2016, by which time an additional area code will be required for Suffolk County. An overlay with the future area code 934 was announced in December 2014.[4]

See also[edit]

New York area codes: 212, 315, 347, 516, 518, 585, 607, 631, 646, 716, 718, 845, 914, 917, 929
North: 203, 401, 860, 959
West: 516 area code 631 East: Atlantic Ocean
South: Atlantic Ocean
Connecticut area codes: 203, 475, 860
Rhode Island area codes: 401


External links[edit]

Coordinates: 40°50′N 73°00′W / 40.84°N 73.00°W / 40.84; -73.00