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is a city in Cass County, Missouri, United States. The population was 8,946 at the 2000 census. It is the county seat of Cass County.
Harrisonville is located at (38.653592, -94.346915). According to the United States Census Bureau, the city has a total area of 8.7 square miles (22.6 km²), of which, 8.6 square miles (22.4 km²) of it is land and 0.1 square miles (0.3 km²) of it (1.14%) is water.