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 22 South Dakota Highway 22 South Dakota Highway 22 (SD 22) is a state highway in the east-central part of the U.S. state of South Dakota. It connects Hazel, Castlewood, and Clear Lake, within the northern part of Hamlin County and the central part of Deuel County. SD 22 originally extended from the Wyoming state line, following what is now U.S. Route 212 (US 212). When the U.S. highway was established, SD 22 was truncated to travel from SD 45 in northern Hand County to SD 41 (current US 281) south of Redfield. This is now SD 26. The current alignment