South Dakota South Dakota South Dakota () is a U.S. state in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux Native American tribes, who compose a large portion of the population and historically dominated the territory. South Dakota is the seventeenth largest by area, but the fifth smallest by population and the 5th least densely populated of the 50 United States. As the southern part of the former Dakota Territory, South Dakota became a state on November 2, 1889, simultaneously with North Dakota. Pierre is the state capital and Sioux Falls, with a population
South Dakota Highway 30 segment extended from US 77, west of White, to the Minnesota state line. Both segments were connected by 1960. Nearly the entire highway west of US 77, which is now I-29, was decommissioned by 1965. South Dakota Highway 30 South Dakota Highway 30 (SD 30) is a state highway in the east-central part of the U.S. state of South Dakota. It connects the north-central part of Brookings with the northeastern part of it. SD 30 was established in the mid-1950s. It had two segments, which were connected by the end of the decade. However, most of the highway west of