Area codes 516 and 363, Telephone prefix in Nassau County, New York, US
Area codes 516 and 363 cover all of Nassau County on Long Island, serving the telephone needs of this densely populated area east of New York City. Both codes apply to the same geographic zone and operate in parallel to meet high demand for phone numbers.
Code 516 was introduced in 1951 and initially covered both Nassau and Suffolk counties until Suffolk received its own code 631 in 1999. Code 363 was added in January 2023 to handle the growing number of connections needed in Nassau County.
The telephone codes 516 and 363 mark Nassau County as a distinct communication zone, reflecting the area's population density and technological requirements.
New phone lines in Nassau County receive either area code 516 or 363 depending on availability at the time of setup. Existing numbers remain unchanged and do not need to be updated, so users keep their familiar phone number.
Nassau County requires two area codes even though it is smaller in size than many other counties because the high population density and the number of mobile phones speed up the assignment of numbers. Both codes apply to the same area, so callers within the county still need to dial the ten-digit number.
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