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Interactive map of the numbering plan areas of the Commonwealth of Pennsylvania (blue). 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.
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.
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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
The second area code, 202, was assigned to the District of Columbia. The allocation of area codes was readjusted as early as 1948 before the implementation of the plan commenced. For example, the Indiana numbering plan area 317 was divided, which essentially provided a larger numbering pool in the Indiana suburbs of Chicago (area code 219).
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 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.