HILLSDALE, a city of southern Michigan, U.S.A., 90 m. W.S.W. of Detroit ; county seat of Hillsdale county. It is served by the New York Central railway. The population was 5,476 in 1920; 1930 it was 5,896. It is the trading centre and shipping point for a rich farming region; manufactures screen doors, cloth ing, metal dies and punches, gas engines and various other com modities; and is the seat of Hillsdale college (Free Baptist, opened at Spring Arbor, Mich., in 1844, and established here in 1853) . Hillsdale was settled in 1837, incorporated as a village in 1847, and chartered as a city in 1869.