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 was the original capital of Dakota Territory. It is named for the Yankton tribe of Nakota Native Americans. Yankton is located on the Missouri River just downstream of the Gavins Point Dam and Lewis and Clark Lake and just upstream of the confluence with the James River. The Human Services Center was established as a psychiatric hospital in 1882 and is on the National Register of Historic Places. Yankton is commonly referred to as the 'River City',... due to its proximity to the Missouri River and the importance that the river played in the city's settlement and development. Yankton is located at 42°52′54″N 97°23′33″W / 42.88167°N 97.3925°W / 42.88167; -97.3925 . According to the United States Census Bureau, the city has a total area of 8.0 square miles , of which 7.8 square miles of it is land and 0.2 square miles of it is water. Yankton has been assigned the ZIP codes 57078-57079 and the FIPS place code 73060.
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| County: | Yankton County |
| State: | South Dakota |
| Population: | 13,866 |
| Area: | 8 sq. mi. |
| Time zone: | Central Time zone |
| Also known as: | Yankton, South Dakota, Yankton County / Yankton city |