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North American area code 631 is a telephone area code in the state of New York created on November 1, 1999, when it was split from area code 516. It is assigned solely to Suffolk County on middle and eastern Long Island. Population centers within the area code include Brookhaven, East Hampton Huntington, Patchogue, Smithtown, Shelter Island, and Southampton Town.
On November 1, 1999, Nassau County retained the 516 area code, while Suffolk received the new 631 area code.
According to the 2013 NPA Exhaust Projection, area code 631 is expected to be exhausted in the first quarter of 2016.
|New York area codes: 212, 315, 347, 516, 518, 585, 607, 631, 646, 716, 718, 845, 914, 917, 929|
|North: 203, 401, 860|
|West: 516||area code 631||East: Atlantic Ocean|
|South: Atlantic Ocean|
|Connecticut area codes: 203, 475, 860|
|Rhode Island area codes: 401|
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