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This is a list of telephone area codes of Pennsylvania. In 1947, the American Telephone and Telegraph Company divided Pennsylvania into four numbering plan areas (NPAs) and assigned distinct area codes for each. Since 1995, several relief actions in form of area code splits and overlays have expanded the list of area
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Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
For relief, area code 267 was established as an overlay on the 215 numbering plan area on July 1, 1997. Local calls across the Delaware/Pennsylvania border required ten-digit dialing. Area code 445 was first proposed in July 2000 as an overlay code on numbering plan area 215/267. [1]
Area codes 215, 267, and 445; Area code 412; Area code 445; Area codes 570 and 272; Area codes 610, 484, and 835; Area codes 717 and 223; Area code 724; Area codes 814 and 582; Area code 835; Area code 878
Area code 835 was eventually approved by the Public Utility Commission on December 2, 2021. Assignment of central office codes in the new area code began on September 2, 2022. [4] When area codes were introduced in 1947, their middle digit was either 0 or 1. In 1994, area code 610 was the last area code assigned with digit 1 in that position.
The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union.
Area code 717 was assigned to the eastern half of Pennsylvania, excluding the Delaware and Lehigh Valleys. Area code 570 was created when the 717 numbering plan area was divided on December 5, 1998. It was the first new Pennsylvania area code created outside Philadelphia and Pittsburgh since the implementation of the area code system.