The former Denton County Courthouse is historically significant for its architecture and its role as the seat of county government from 1896, when it was built, to the late 1970s. Listed on the National Register of Historic Places, the building is a fine example of Romanesque architecture and is made of limestone and sandstone. Designed by W.C. Dodson, it features a central tower, arches, columns, and other notable elements. The building is now home to the Courthouse-on-the-Square Museum, which opened in 1979 and is located on the first floor. The museum is operated by the Office of History and Culture (OHC) and houses a variety of exhibits featuring a range of artifacts and other items showcasing Denton County history. The building is also the location of the OHC's Special Collections, which is open to researchers by appointment only.