Allegheny County, Pennsylvania

county in southwestern Pennsylvania, United States
Flag of Allegheny County, Pennsylvania.svg
Seal of Allegheny County, Pennsylvania.svg

Allegheny County (/ælɪˈɡni/) is a county in the southwest of the U.S. state of Pennsylvania. As of 2016 the population was 1,225,365. The county seat is Pittsburgh.[1]

Allegheny was Pennsylvania's first to bear a Native American name, being named after the Allegheny River.


  1. "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.