The Polk County Courthouse, 400 Hawkeye St. in Osceola, was built in 1921–22 to designs by William F. Gernandt of Omaha, with terra cotta trim, fireproof walls and marble stairs, and was listed on the National Register in 1990. It replaced an 1882 brick courthouse; the first, a frame building of 1872, burned on January 1, 1881. Open Monday to Friday, 8 to 5.