La Grange (lə grānj). 1 City (1990 pop. 25,597), seat of Troupe co., W central Ga., inc. 1828. It is an industrial center that produces lumber, plastics, textiles, and transportation equipment. The city is also a processing and shipping center for a rich agricultural area. Many classic revival houses and restored historic buildings are in La Grange, which is the seat of La Grange College. 2 Town (1990 pop. 15,362), Cook co., NE Ill., a suburb of Chicago; settled 1830s, inc. 1879. It is primarily residential with some manufacturing. Limestone quarries are nearby.