Area code 631
Encyclopedia
New York
New York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...
in eastern Long Island
Long Island
Long Island is an island located in the southeast part of the U.S. state of New York, just east of Manhattan. Stretching northeast into the Atlantic Ocean, Long Island contains four counties, two of which are boroughs of New York City , and two of which are mainly suburban...
exclusively for Suffolk County
Suffolk County, New York
Suffolk County is a county located in the U.S. state of New York on the eastern portion of Long Island. As of the 2010 census, the population was 1,493,350. It was named for the county of Suffolk in England, from which its earliest settlers came...
.
Suffolk used to share the area code 516
Area code 516
Area code 516 is used for Long Island's Nassau County, located directly east of the New York City borough of Queens and west of Suffolk County....
with neighboring Nassau County
Nassau County, New York
Nassau County is a suburban county on Long Island, east of New York City in the U.S. state of New York, within the New York Metropolitan Area. As of the 2010 census, the population was 1,339,532...
until November 1, 1999, when it was decided the area code would be split and Suffolk would end up with a new area code: 631.
Upon nationwide adoption of area codes in October 1947, Suffolk, along with Nassau, were given the 914
Area code 914
Area code 914 is a telephone area code within New York state. 914's boundaries are the same as Westchester County. It was one of the original area codes established in October 1947....
area code along with counties in the lower Hudson Valley until it split very soon after in 1951, giving Long Island the 516 area code exclusively.