Ouachita County Arkansas (Vacant / Not In Use) has 7 places on the National Register of Historic Places including 5 places of Statewide significance. Significant places include Leake-Ingham Building, Lester And Haltom No. 1 Well Site, Old Camden Post Office, Tate's Bluff Fortification and Two Bayou Methodist Church and Cemetery.
Some of the country's most noteable architects helped create the Ouachita County places including Asa Morgan, J.T. Mendenhall and Missouri-Pacific Railroad. Prominent architectural styles found in Ouachita Country are Greek Revival, Late 19th And 20th Century Revivals and Romanesque.