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 10 a curve to the south and then to the southeast, it reaches its eastern terminus at the Minnesota state line. Here, the roadway continues as Minnesota State Highway 28 (MN 28). SD 10 was formerly the "Glacier Trail". It was also formerly known as SD 12. The highway was redesignated in 1927, presumably to avoid confusion with nearby US 12. The segment of the highway west of US 83 was added in the early 1960s. South Dakota Highway 10 South Dakota Highway 10 (SD 10) is a state highway in the north-central and northeastern portions of the U.S. state of