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

Category:1780s establishments in Pennsylvania
Category:1788 establishments in the United States
Category:Pennsylvania counties