Morgan County is a county located in the central portion of the U.S. state of Missouri. As of the 2020 census, the population was 21,006. Its county seat is Versailles. The county was organized January 5, 1833, and named for General Daniel Morgan of the American Revolutionary War.

Versailles is a city in Morgan County, Missouri, United States. The population was 2,539 at the 2020 census. It is the county seat of Morgan County. Locally, the town's name is pronounced "Ver-sails", rather than the French "Ver-seye".