878 is an overlay area code for area codes 412 and 724 in south-western 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 May, 2007, 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
| Commonwealth of Pennsylvania Area Codes: 215, 267, 412, 484, 570, 610, 717, 724, 814, 835, 878 |
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North: 814 |
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| West: 330/234 and 304 |
Area code 878, is an overlay on 724, which surrounds 412/724 |
East: 814 |
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South: 304\681 |
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| State of Ohio area codes: 216, 234, 330, 419, 440, 513, 567, 614, 740, 937 |
| State of West Virginia Area Codes: 304/681 |
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