Richland County Louisiana has 10 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Rhymes, Nonnie Roark, Memorial Library, Delhi Municipal Baseball Park, Downtown Delhi Historic District, Mangham State Bank Building and Miles--Hanna House.
Some of the country's most noteable architects helped create the Richland County places including Edward F. Neild and Capt. Vickers. Prominent architectural styles found in Richland Country are Greek Revival, Bungalow/Craftsman and Classical Revival.