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Allegheny County, Pennsylvania

US county information
NameAllegheny County
Largest cityPittsburgh
US Area
Total Area745 sq mi (1929.6 km2)
Land Area730 sq mi (1890.7 km2)
Water Area15 sq mi (38.9 km2)
Population1223348|density_sq_mi=1675.8 (2010)
Density646.9/km2 (1675.8/sq mi)

     Home | County | Allegheny County Pennsylvania

Allegheny County is a county in the southwestern part of the U.S. state of Pennsylvania. As of the 2010 census, the population was 1,223,348; making it the second most populous county in Pennsylvania, following Philadelphia County. The county seat is Pittsburgh. The county forms the nucleus of the Pittsburgh metropolitan area, Pittsburgh DMA, and Pittsburgh Tri-State Area.

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