The area code 631 is used in the state of New York in eastern Long Island exclusively for Suffolk County. Official language(s) None, English de facto Capital Albany Largest city New York City Area - Total - Width - Length - % water - Latitude - Longitude Ranked 27th 141,205 km² 455 km 530 km 13. ... The four counties of Long Island. ... Suffolk County is a county located in the state of New York. ...
Suffolk used to share the area code 516 with neighboring Nassau County 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. Area code 516 is used for Long Islands Nassau County, located directly east of the New York City borough of Queens and west of Suffolk County. ... Nassau County is a county located outside New York City in the state of New York. ...
Upon nationwide adoption of area codes in October 1947, Suffolk, along with Nassau, were given the 914 area code along with other counties upstate until it split very soon after in 1951, giving Long Island the 516 area code exclusively.[1] 914 is the area code for Westchester County, New York. ...