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 13 intersection with U.S. Route 14 (US 14). SD 13 was formerly a segment of SD 11. This was changed to SD 13 between 1932 and 1935. At that time, its original northern terminus was extended eastward to its current location at US 14 north of Elkton. This was due to a rerouting of US 14 in the early 1930s. South Dakota Highway 13 South Dakota Highway 13 (SD 13) is a state highway in the east-central part of the U.S. state of South Dakota. It connects Flandreau with Elkton. SD 13 was originally part of SD 11's path. SD 13