The Commonwealth of Pennsylvania is divided into seven distinct geographic numbering plan areas in the North American Numbering Plan, and served by a total of 15 area codes. All NPAs have at least two area codes, but the large metro area of Philadelphia has three, as well as the large region surrounding it in the southeast of the state.
In 1947, the American Telephone and Telegraph Company divided Pennsylvania into four numbering plan areas and assigned one distinct area code to each. Since 1995, several relief actions in form of area code splits and overlays have expanded the number of area codes. As a result, all numbering plan areas are overlay complexes and ten-digit dialing is mandatory statewide.
Area code Yearcreated ParentNPA Overlay Numbering plan area 215 1947 – 215/267/445 Philadelphia and its immediately surrounding areas in the southeast corner of Pennsylvania 267 1997 215 445 2018 215/267 610 1994 215 484/610/835 Southeastern Pennsylvania outside Philadelphia, including the Lehigh Valley, but excluding all but northernmost Bucks County and the eastern half of Montgomery County 484 1999 610 835 2022 610/484 412 1947 – 412/878 Pittsburgh and its immediately surrounding areas in Allegheny County 724 1998 412 724/878 Western Pennsylvania, surrounding 412 878 2001 412 412/878 Western Pennsylvania, NPA 412 and 724 724 724/878 717 1947 – 223/717 South Central Pennsylvania, including Harrisburg, Lancaster, and York. 223 2017 717 570 1998 717 272/570 Northeastern Pennsylvania, including Scranton and Wilkes-Barre 272 2013 570 814 1947 – 582/814 Northwestern and central Pennsylvania, from Bedford County to Centre County, including the city of Erie 582 2021 814
See also List of North American Numbering Plan area codes Original North American area codes
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