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 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
| Commonwealth of Pennsylvania Area Codes: 215, 267, 412, 484, 570, 610, 717, 724, 814, 835, 878 | ||
|---|---|---|
| North: 814 | ||
| West: 330/234 and 304 | Area code 878, is an overlay on 724, which surrounds 412/724 | East: 814 |
| South: 304\681 | ||
| 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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