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Area code 878

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878 is an overlay area code for area codes 412 and 724 in Southwestern Pennsylvania centered in Pittsburgh. It came into effect on August 17, 2001, making 10-digit dialing mandatory in the 412 and 724 areas of Western Pennsylvania.

As of July 2009, there are no numbers assigned to area code 878, as number-conserving policies put into place at the time of its introduction have so far been successful.

See also

  • "Area Code Maps". NANPA.


Pennsylvania area codes: 215/267/445, 412, 570/272, 610/484/835, 717/223, 724, 814/582, 878
North: 814
West: 234/330, 304/681 Area code 878 (overlays 412 and 724) East: 814
South: 304/681
Ohio area codes: 216, 330/234, 419/567, 440/436, 513/283, 614/380, 740/220, 937/326
West Virginia area codes: 304/681


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