Area code 412
Area code 412 is a Commonwealth of Pennsylvania telephone area code which serves Pittsburgh , most of surrounding Allegheny County ( except the northern edge of Allegheny County served by Consolidated Communications , formerly the North Pittsburgh Telephone Company ) and small portions of Washington and Westmoreland counties . 
<triplet> Pennsylvania <subj> Allegheny County <obj> contains administrative territorial entity <subj> Westmoreland <obj> contains administrative territorial entity <triplet> Pittsburgh <subj> Allegheny County <obj> located in the administrative territorial entity <triplet> Allegheny County <subj> Pennsylvania <obj> located in the administrative territorial entity <triplet> Washington <subj> Pennsylvania <obj> located in the administrative territorial entity <subj> Allegheny County <obj> shares border with <triplet> Westmoreland <subj> Pennsylvania <obj> located in the administrative territorial entity <subj> Allegheny County <obj> shares border with