Get an ADT-Monitored Home Security System in West Mifflin, Pennsylvania

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.

Although the borough is heavily residential, it is home to one of America’s oldest conventional amusement parks, Kennywood Park. Other employers include innovative naval nuclear propulsion technology research and proceed facility, Bettis Atomic Power Laboratory; monorail manufacturer Bombardier; US Steel’s Mon Valley Works–Irvin Plant; Community College of Allegheny County’s South Campus; and the Allegheny County Airport.

According to the United States Census Bureau, the borough has a total Place of 14.4 square miles (37 km), of which 14.2 square miles (37 km) is house and 0.3 square miles (0.78 km), or 1.80%, is water. The landscape is largely hilly and wooded, and the borough’s eastern boundary is contiguous once the Monongahela River three surgically remove times. Much of the native landscape has been altered as a result of the historic dumping of steel mill byproducts such as slag and fly ash.