Area code 631, Telephone prefix for Suffolk County, New York, US
Area code 631 is a telephone prefix serving Suffolk County on Long Island, covering towns such as Babylon, Huntington, and Brookhaven. The prefix connects coastal villages with inland communities across the eastern portion of the island.
The prefix originated in 1999 through a division of former area code 516, driven by growing demand for telephone numbers across the region. Since 2016, it shares the territory with overlay code 934.
The area code region contains numerous Long Island vineyards, lighthouses, preserved farms, and suburban communities that maintain strong connections to New York City.
Callers within this prefix area must dial ten digits for all calls, including local ones, since the introduction of the overlay system. The requirement applies to both landline and mobile phones throughout the coverage zone.
The telephone prefix serves multiple townships near coastal areas, connecting over 641 active phone number prefixes across Suffolk County communities.
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