Allegheny County
County in Pennsylvania
Allegheny County 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. Its county seat and most populous city is Pittsburgh,... Wikipedia
Population: 1.233 million (2022)
Cities: Pittsburgh, Sewickley, Monroeville, and more
Tax rate: 7%
Congressional districts: 12th, 17th
Founded: September 24, 1788
Largest city: Pittsburgh
Named for: Allegheny River