Geography of South Dakota of the federal or state government, such as Badlands National Park, Wind Cave National Park, and Custer State Park, are located in the state. In 2011, the population of South Dakota was estimated to be 824,082, and the state ranks fifth-lowest in both total population as well as population density in the United States. Sioux Falls, with a population of just over 170,000, is the largest city in the state. Rapid City ranks as South Dakota's second-largest city, and Pierre is the state capital. Historically a very agricultural state, the service and tourism sectors have grown in economic importance in
South Dakota Highway 71 Highway 471. After that, it leaves the forest and ends at US 18 Byp. in Hot Springs. The road was originally commissioned in 1936 as part of South Dakota Highway 87. Part of that highway was given the SD 71 designation in 1962. South Dakota Highway 71 South Dakota Highway 71 (SD 71) is a state highway in the southwestern part of the U.S. state of South Dakota. It travels from the Nebraska state line, where it continues as N-2/N-71, through the Black Hills National Forest, to U.S. Route 18 Bypass (US 18 Byp.) in Hot Springs. The road was