Area Code 631 was created in 1999 as a result in split of area code 516 and it serves one of the Middle Atlantic States of United States - The State of New York. The particular code serves the areas located in Long Island - particularly the Suffolk County. The County of Suffolk was served by area code 516 until 1st November 1999. Then the code 516 split off and the Suffolk County was assigned with new area code 631.
The State of New York has reserved total fourteen area codes:
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