Yankton County is located in the southeastern part of South Dakota, bordered by the Missouri River to the west. The county seat is the city of Yankton, which is known for its rich history and vibrant community. Established in 1862, Yankton County is one of the oldest counties in the state and features a mix of rural and urban areas. The county is home to several parks and recreational areas, including Lewis and Clark Lake, which offers opportunities for boating, fishing, and camping. Yankton County also hosts various annual events and festivals that celebrate its cultural heritage, making it a lively place for residents and visitors alike.