Allegheny County, Pennsylvania

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Allegheny County ( AL-ig-AY-nee) is a large urban county in Pennsylvania, United States. As of the 2025 census estimate, the population was 1,225,035, a 2% decrease of 25,543 residents since 2020, making it the state's second-most populous county, after Philadelphia County. Its county seat and largest city is Pittsburgh, Pennsylvania's second largest city. The county is part of the Greater Pittsburgh region of the commonwealth, and is the center of the Pittsburgh media market. Allegheny was the first county in Pennsylvania to be given a Native American name. It was named after the Lenape word for the Allegheny River. The meaning of "Allegheny" is uncertain. It is usually said to mean "fine river". Some historians state that the name may come from a Lenape account of an ancient mythical tribe called "Allegewi" who lived along the river before being taken over by the Lenape.

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