Area codes 516 and 363

The numbering plan area (NPA) comprises Nassau County on Long Island.

When the American Telephone and Telegraph Company (AT&T) established the first nationwide telephone numbering plan for Operator Toll Dialing in October 1947, Nassau and Suffolk counties, the lower Hudson Valley, and some areas adjacent were assigned area code 914.

[1] Despite Long Island's growth in both population and telephone service during the second half of the 20th century, this configuration remained for five decades.

By the late 1990s, the proliferation of pagers and cell phones required further division to provide more telephone numbers for Long Island.

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