The Codington County Courthouse is a courthouse serving Codington County, located at 14 First Avenue Southeast, Watertown, South Dakota. Codington County is part of South Dakota's Third Circuit Court. The building was constructed by Gray Construction, under the direction of architects Freed, Perkins & McWayne, between 1925 and 1929 at a cost US$375,000 (equivalent to $5,651,890 in 2020). The rotunda features two large murals painted by Vincent Aderente of New York, although his name is misspelled as Adoratti on the historical marker at the courthouse grounds.