40°50′N 73°00′W / 40.84°N 73.00°W / 40.84; -73.00

The red area is area code 10m/934; the blue area is the rest of New York State.

Area codes 631 and 934 are the telephone area codes in the North American Numbering Plan (NANP) for Suffolk County, New York, on Long Island. Area code 631 was created in 1999 in a split from 516; and 934 was added as an overlay in 2016. Communities within the area include Babylon, Huntington, Islip, Smithtown, Brookhaven, Riverhead, Southampton, Southold, Shelter Island, and East Hampton.

History of Suffolk County area codes

1947–1951: 914

With the announcement of a new nationwide telephone numbering plan by the American Telephone and Telegraph Company (AT&T) in October 1947, Suffolk County, Nassau County, the lower Hudson Valley, and some areas adjacent were assigned area code 914.[1]

1951–1999: 516

During 1951, area code 516 was assigned to Suffolk and Nassau, which were separated thereby from area code 914.[1]

1999–2016: 631

On November 1, 1999, area code 631 was created solely for Suffolk County, to satisfy the increased need for telephone numbers mainly due to cellular services, while Nassau County retained area code 516. Permissive dialing for numbers in 516 across Long Island continued until the spring of 2000.[2]

2016–present: 631/934 overlay

On July 16, 2016, area code 934 was assigned to overlay 631, which was nearing depletion of central office codes. This was the first overlay in an area in the state of New York outside New York City, and required ten-digit dialing for both area codes, effective June 18, 2016.[3]

See also


References

  1. 1 2 "NANP Area Code History: 1948–1959". Area Code History. Archived from the original on September 11, 2002. Retrieved November 4, 2018.
  2. ↑ Rather, John (October 31, 1999). "Suffolk County Gears Up for 631 Area Code". The New York Times. Retrieved November 4, 2018.
  3. ↑ Kitchen, Patricia. "Area code countdown: Suffolk 10-digit dialing begins in June". Newsday. May 14, 2016.
New York area codes: 212/332/646, 315/680, 347/718/929, 363/516, 518/838, 585, 607, 631/934, 624/716, 329/845, 914, 917
North: 203/475, 401, 860/959
West: 516/363 Area codes 631 and 934 East: Atlantic Ocean
South: Atlantic Ocean
Connecticut area codes: 203/475, 860/959
Rhode Island area codes: 401
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