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Interactive map of Allegheny County, Pennsylvania Allegheny County ( / ˌ æ l ɪ ˈ ɡ eɪ n i / AL -ig- AY -nee ) is a county in Pennsylvania , United States. As of the 2020 census, the population was 1,250,578, making it the state's second-most populous county , after Philadelphia County .
English: This is a locator map showing Allegheny County in Pennsylvania. For more information, see Commons:United States county locator maps. Date: 12 February 2006:
General Highway Map, Allegheny County (PDF) (Map) (2016 ed.). 1:65,000. Cartography by PennDOT Bureau of Planning and Research, Geographic Information Division, in cooperation with the Federal Highway Administration. Harrisburg, PA: Pennsylvania Department of Transportation
Parts of Lycoming County; Attached to Centre County until 1814 and to Lycoming County until 1826 for judicial and elective purposes. McKean was fully organized only in 1826. Thomas McKean, second Governor of Pennsylvania: 39,519: 984 sq mi (2,549 km 2) Mercer County: 085: Mercer: 1800: Parts of Allegheny County: Hugh Mercer, Revolutionary War ...
Greater Pittsburgh is the metropolitan area surrounding the city of Pittsburgh in Western Pennsylvania, United States. [4] The region includes Allegheny County, Pittsburgh's urban core county and economic hub, and seven adjacent Pennsylvania counties: Armstrong, Beaver, Butler, Fayette, Lawrence, Washington, and Westmoreland in Western Pennsylvania, which constitutes the Pittsburgh, PA ...
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Allegheny City was a municipality that existed in the U.S. state of Pennsylvania from 1788 until it was annexed by Pittsburgh in 1907. It was located north across the Allegheny River from downtown Pittsburgh, with its southwest border formed by the Ohio River, and is known today as the North Side.