South Dakota is located in the midwest and is named after Sioux American Indian tribes. Centrally-located Pierre is the state capital and Sioux Falls is the state's largest city. With an estimated population of 804,194, the center of population of South Dakota is located in Buffalo County. According to recent estimates, Lincoln County is the ninth-fastest growing county in the U.S. In addition to Sioux Falls, several cities and towns included in the metropolitan area are Brandon, Dell Rapids, Tea, Harrisburg, Worthing, Lennox, Hartford, Crooks, and Baltic