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De Smet, city, seat (1880) of Kingsbury county, east-central South Dakota, U.S. It lies about 70 miles (110 km) northwest of Sioux Falls, about halfway between Huron (west) and Brookings (east). It was settled in 1879 during construction of the railroad and was named for Pierre-Jean de Smet, a Belgian Jesuit missionary known as the “Apostle to the Indians.” It developed as a centre for dairying. Today the economy is based on agriculture (corn [maize],...