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  1. Allegheny County ( / ˌælɪˈɡeɪni / AL-ig-AY-nee) is a county in Pennsylvania, United States. It is located in Southwestern Pennsylvania. As of the 2020 census, the population was 1,250,578, making it the state's second-most populous county, after Philadelphia County.

  2. en.wikipedia.org › wiki › PittsburghPittsburgh - Wikipedia

    Pittsburgh (/ ˈ p ɪ t s b ɜːr ɡ / PITS-burg) is a city in the Commonwealth of Pennsylvania and the county seat of Allegheny County. It is the second-most populous city in Pennsylvania after Philadelphia and the 68th-most populous city in the U.S., with a population of 302,971 as of the 2020 census.

  3. Allegheny County: 003: Pittsburgh: 1788: Parts of Washington and Westmoreland Counties: Delaware word for the Allegheny River, which possibly translates to "beautiful river" 1,233,253: 745 sq mi (1,930 km 2) Armstrong County: 005: Kittanning: 1800: Parts of Allegheny, Lycoming, and Westmoreland Counties: John Armstrong, Revolutionary ...