Mannington Historic District is a national historic district located at Mannington, Marion County, West Virginia. The district includes 207 contributing buildings in Mannington's central business district and surrounding residential areas. Notable buildings include the railroad depot (c. 1896), Exchange Bank Building (c. 1897), U.S. Post Office (c. 1938), Colonial Building (c. 1904), the Blackshere House (c. 1900), the Bartlett House (c. 1900), First National Bank Building (c. 1909), the Furbee Building (c. 1900), the Hammond House (c. 1855), the Modi Building (1917), and the Mannington District Public High School (1925). The contributing buildings are representative of popular late-19th- and early 20th-century architectural styles.