Clay County is located in the U.S. state of Missouri and is part of the Kansas City metropolitan area. As of the 2020 census, the county had a population of 253,335, making it the fifth-most populous county in Missouri. Its county seat is Liberty. The county was organized January 2, 1822, and named in honor of U.S. Representative Henry Clay from Kentucky, later a member of the United States Senate and United States Secretary of State.

The Missouri House of Representatives is the lower chamber of the Missouri General Assembly. It has 163 members, representing districts with an average size of 37,000 residents. House members are elected for two-year terms during general elections held in even-numbered years.