Norristown is a municipality with home rule status and the county seat of Montgomery County, Pennsylvania, United States, in the Philadelphia metropolitan area. Located along the Schuylkill River, approximately 6 miles from Philadelphia, Norristown had a population of 35,748 as of the 2020 census. It is the fourth-most populous municipality in the count…Norristown is a municipality with home rule status and the county seat of Montgomery County, Pennsylvania, United States, in the Philadelphia metropolitan area. Located along the Schuylkill River, approximately 6 miles from Philadelphia, Norristown had a population of 35,748 as of the 2020 census. It is the fourth-most populous municipality in the county and second-most populous borough in Pennsylvania.