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Line 1: − '''Allegheny County''' is a county located in Western [[Pennsylvania]]. As of the 2020 census, the population was 1,250,578, making it the state's second-most populous county, after [[Philadelphia County]]. Its county seat and most populous city is [[Pittsburgh]], Pennsylvania's second most populous city.+ + − +
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*[[Allegheny County, Pennsylvania]]
*[[Allegheny County, North Carolina]]
[[Category:Pennsylvania]]
[[Category:United States]]