Clay County on the map of South Dakota 2024. Cities, roads, borders and directions in Clay County of South Dakota.

Clay County is located in the southeastern corner of South Dakota. This special county is named after Henry Clay (1777-1852), U.S. Senator from Kentucky and prominent 19th Century political figure. The county seat of Clay County is Vermillion. The county's area is about 412 square miles. Established in 1862, today Clay County is home to 15 thousand residents. This map shows the borders of Clay County as well as neighboring counties, including major highways and natural objecsts as of 2024. Zoom in or out of the map using the plus/minus panel. Move the center of this map by dragging it. Also check out the satellite map of Clay County.