Allegheny County, Pennsylvania
Allegheny County () is a county in the southwest of the U. S. state of Pennsylvania. As of 2020 the population was 1,250,578. The county seat is Pittsburgh.
Allegheny was Pennsylvania' s first to bear a Native American name, being named after the Allegheny River.
References
1780s establishments in Pennsylvania
1788 establishments in the United States
Pennsylvania counties