Harrisonville Courthouse Square Historic District is a national historic district located at Harrisonville, Cass County, Missouri. The district includes 34 contributing buildings, 1 contributing structure, and 1 contributing object in the central business district of Harrisonville. It developed between about 1880 and 1943, and includes representative examples of Italianate, Queen Anne, Colonial Revival, Tudor Revival, and Renaissance Revival style architecture. Notable buildings include the Cass County Courthouse (1897), New Method Laundry (1929), Cass County Democrat (c. 1901), Wooldridge Building (before 1885), Bank of Harrisonville (1900-1901), Wirt's Opera House Building (1907; 1940-alterations), Post Office Building (1925), Emmons Building/Bowman Building (1887), Evans Building (1890)