 They are in a variety of late 19th- and early 20th-century architectural styles.Notable buildings include the Watson Building (1909-1911), U.S. Court House and Post Office (1940), Monongahela Valley Traction Freight House (1927), the Jacobs and Hutchinson complex, and the Library (1914).The Marion County Courthouse and Sheriff's House and Robert H. Mollohan-Jefferson Street Bridge are located in the district and listed separately on the National Register of Historic Places.