<Tr> <Th> GNIS feature ID </Th> <Td> 1265178 </Td> </Tr> <Tr> <Th> Website </Th> <Td> http://www.desmetsd.com/ </Td> </Tr> <P> De Smet is a city in and the county seat of Kingsbury County, South Dakota, United States . The population was 1,089 at the 2010 census . </P> <P> Located in the area of South Dakota known as East River (east of the Missouri River, which diagonally divides the state), De Smet was platted by European Americans in 1880 . It was named for Belgian Father Pierre De Smet, a 19th - century Jesuit missionary who worked with Native Americans in the United States and its territories for most of his life . In the mid 1880s, prairie fires and failures of crops after a three - year period of drought caused many settlers to relocate their farms and homesteads to easier areas . By 1917, De Smet was a cow town, with many trains passing through every day carrying cattle to market . </P>

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