Barry County is a county located in the southwest portion of the U.S. state of Missouri. As of the 2020 Census, the population was 34,534. Its county seat is Cassville. The county was organized in 1835 and named after William Taylor Barry, a U.S. Postmaster General from Kentucky. The town of Barry, also named after the postmaster-general, was located just north of Kansas City, not in Barry County.

Cassville is a city in Flat Creek Township, Barry County, Missouri, United States. According to the 2020 census, the population of Cassville was 3,190. Cassville is one of the primary markets and job centers for an estimated 14,000 people living in the surrounding area. It is the county seat of Barry County.