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 471 north and enters the city of Edgemont as 3rd Street before turning into 2nd Avenue. The designation continues west onto A Street, passing through Edgemont before briefly turning north on 6th Avenue to terminate at US 18. South Dakota Highway 471 South Dakota Highway 471 (SD 471) is a state highway in the southwestern part of the U.S. state of South Dakota. It travels from SD 71 southeast of Rumford to U.S. Route 18 (US 18) in Edgemont. SD 471 was designated in 1976. It was previously a portion of SD 52, which had been used on this route from