The present Calhoun County Courthouse was built on the square in Rockwell City in 1914. Added to the National Register of Historic Places in 1966, both the interior and exterior have been well-preserved and the building has seen minimal changes since its original construction. A number of restoration projects began in 1982, including stripping and varnishing of the oak woodwork, implementation of a new tile ceiling, and a cleaning and restoration of the beautifully unique stained glass dome ceiling.