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Norristown, borough (town), seat of Montgomery county, southeastern Pennsylvania, U.S. It lies on the north bank of the Schuylkill River, 17 miles (27 km) northwest of Philadelphia and near the eastern terminus of the Pennsylvania Turnpike. The site was purchased in 1704 by Isaac Norris and William Trent from William Penn, Jr. (son of Pennsylvania’s founder), and was organized as a township in 1730. The land was acquired in 1776 by the College and Academy...