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is a city in Yankton County, South Dakota, United States. The population was 13,528 at the 2000 census. It is the county seat of Yankton County. Yankton was the original capital of Dakota Territory. It is named for the Yankton tribe of Nakota (Sioux) 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. Yankton is commonly referred to as the 'River City', due to its close proximity to the Missouri River, and the importance that it played in the city's settling and subsequent development.
According to the United States Census Bureau, the city has a total area of 8.0 square miles (20.7 km²), of which, 7.8 square miles (20.1 km²) of it is land and 0.2 square miles (0.6 km²) of it (3.00%) is water.
Yankton has been assigned the ZIP codes 57078-57079 and the FIPS place code 73060.