Cassville is a city in Flat Creek Township, Barry County, Missouri, United States. According to the 2010 census the population of Cassville was 3,266. It was estimated to be 3,290 by the City of Cassville as of July 1, 2019. 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.

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