Information for Area Code: 878-xxx-xxxx - PA - PENNSYLVANIA
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Information about Area Code 878
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.
