Williamsport, city (1990 pop. 31,933), seat of Lycoming co., central Pa., on the Susquehanna River; settled 1772, inc. as a borough 1806, as a city 1866. Williamsport grew with the development of the lumber industry in the 19th cent. It is a tourist center, a manufacturing city, and the trade and distribution point for an agricultural area. The chief manufactures are plastic, metal, paper, wood, fiberglass, and leather products; lumber; apparel; furniture; machinery; and transportation equipment. Williamsport is the home of Little League baseball; the Little League world series is held there each year. Also in the city are Lycoming College and Pennsylvania College of Technology (part of Pennylsvania State Univ.).