Brookings, city (1990 pop. 16,270), seat of Brookings co., E S.Dak., on the Big Sioux River; inc. 1883. A trade center in a livestock and grain region, Brookings is an important seed-processing point. Other industries produce electronic equipment, construction materials, machinery, fabricated metal products, and medical and dental equipment. In the city are South Dakota State Univ. and an art museum.