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Area code 412 - Wikipedia
Area code 412 is a telephone area code in the North American Numbering Plan (NANP) for the Commonwealth of Pennsylvania. The numbering plan area (NPA) comprises the city of Pittsburgh, most of surrounding Allegheny County, and small portions of Washington and Westmoreland counties. The area … See more
When the American Telephone and Telegraph Company (AT&T) created the first nationwide telephone numbering plan for the continental … See more
The numbering plan area includes Allegheny county with the exception of its northern edge served by Consolidated Communications, … See more
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