Yankton, South Dakota Yankton, South Dakota Yankton is a city in, and the county seat of, Yankton County, South Dakota, United States. The population was 14,454 at the 2010 census. Yankton is the principal city of the Yankton Micropolitan Statistical Area, which includes the entirety of Yankton County, and which had an estimated population of 22,662 as of July 1, 2017. Yankton was the first capital of Dakota Territory. It is named for the Yankton tribe of Nakota (Sioux) Native Americans; Yankton is derived from the Nakota word "I-hank-ton-wan" ("the end village"). Yankton is located on the Missouri River just downstream of the
Bismarck, North Dakota to the Union. Bismarck is across the river from Mandan, named after a historic Native American tribe of the area. The two cities make up the core of the Bismarck-Mandan Metropolitan Statistical Area. The North Dakota State Capitol, the tallest building in the state, is in central Bismarck. The state government employs more than 4,000 in the city. As a hub of retail and health care, Bismarck is the economic center of south-central North Dakota and north-central South Dakota. For thousands of years, present-day central North Dakota was inhabited by indigenous peoples, who created successive cultures. The historic Mandan Native