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Cass County The county seat of Cass County is Harrisonville Missouri. Organized March 3, 1835, from Jackson County and named for Lewis Cass, Michigan senator and presidential candidate. Originally organized as Van Buren County in honor of Martin Van Buren, the Democratic legislature changed the name to Cass on February 19, 1849, to honor Van Buren's Democratic opponent Lewis Cass. Van Buren ran as the Free-Soil candidate for president in 1848. |