| Information | |
|---|---|
| has gloss | eng: 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. |
| lexicalization | eng: Area code 878 |
| instance of | c/Area codes in Pennsylvania |
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