Hughes County, South Dakota Hughes County, South Dakota Hughes County is a county located in the U.S. state of South Dakota. As of the 2010 census, the population was 17,022, making it the least populous capital county in the nation, and the twelfth-most populous county in South Dakota. Its county seat is Pierre, the state capital. The county was created in 1873 and organized in 1880. It was named for Alexander Hughes, a legislator. Hughes County is part of the Pierre, SD Micropolitan Statistical Area. According to the U.S. Census Bureau, the county has a total area of , of which is land and
South Dakota Highway 25 South Dakota Highway 25 South Dakota Highway 25 (SD 25) is a state highway in the eastern part of the U.S. state of South Dakota. It connects Scotland, Howard, De Smet, and Webster. It consists of two disconnected segments. Its shorter southern segment extends from SD 50 northwest of Tabor to U.S. Route 18 (US 18) west of Olivet. Its much-longer northern segment extends from SD 262 northwest of Emery, through Howard, De Smet, and Webster, to the North Dakota state line. Here, the roadway continues as North Dakota Highway 18 (ND 18). SD 25's northern segment was established in