Area code 401

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Area code 401 is the sole telephone area code in the North American Numbering Plan (NANP) for the U.S. state of Rhode Island. 401 is one of the original North American area codes, which were established in 1947.

Area code 401 is not projected to exhaust its supply of vacant central office codes until 2055. [1]

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In the administration of the North American Numbering Plan, central office code protection is a numbering policy for maintaining local seven-digit dialing in communities that extend on both sides of the boundary line between multiple numbering plan areas (NPAs), such as in cross-border towns on state lines. Code protection prevents the use of the same telephone number on both sides by not assigning the same central office code of one NPA in the adjacent NPA.

References

  1. "2024-1 NRUF and NPA Exhaust Analysis" (PDF). nationalnanpa.com. April 2024. Retrieved July 6, 2024.
Rhode Island area codes: 401
North: 508/774
West: 860/959 area code 401East: 508/774
South: 631/934
Connecticut area codes: 203/475, 860/959
Massachusetts area codes: 339/781, 351/978, 413, 508/774, 617/857
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