Jefferson Hills is a borough in Allegheny County, Pennsylvania, United States. In the 2020 census, the population was 12,424. It is part of the Pittsburgh metropolitan area.

West Mifflin is a borough in Allegheny County, Pennsylvania, United States, located southeast of downtown Pittsburgh. The population was 19,589 at the 2020 census. It is named after Thomas Mifflin, 1st Governor of Pennsylvania, signer of the United States Constitution, and 1st Quartermaster General of the United States Army.