Area Code 631 History:
Area code 631 was put into service. Area code 631 was created from a split of area code 516.
Counties in New York within area code 631 include:
Major cities or places in New York within area code 631 include:
Area code 631 serves Suffolk County on Long Island the including the towns and communities of Babylon, Brookhaven, East Hampton, Huntington, Islip, Riverhead, Shelter Island, Smithtown, Southampton and Southold.