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.
West Mifflin is a borough in Allegheny County Pennsylvania United States located southeast of downtown Pittsburgh The population was 19589 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