<P> North American area code 516 is a telephone area code in the state of New York . 516 serves the Nassau County portion of Long Island . </P> <P> When the North American Numbering Plan was devised by AT&T in October 1947, Nassau and Suffolk counties, and the lower Hudson Valley, were assigned area code 914 . In 1951, Nassau and Suffolk were split off as a separate numbering plan area (NPA) with area code 516 . </P> <P> Despite Long Island's dramatic growth in both population and telephone service in the second half of the 20th century, this configuration remained in place for five decades . By the late 1990s, the proliferation of cell phones and pagers required further division to provide more telephone numbers for Long Island . On November 1, 1999, Suffolk was split off as a new numbering plan area with area code 631, while Nassau retained 516 . Permissive dialing of 516 across Long Island continued until spring 2000 . </P>

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