Charles Mix County South Dakota has 14 places on the National Register of Historic Places including 1 place of National significance and 2 places of Statewide significance. Significant places include Geddes Historic District, Lake Andes Carnegie Library and South Dakota Dept. of Transportation Bridge No. 12-503-230, Charles Mix County Courthouse and Church of Christ in LaRoche Township.
Some of the country's most noteable architects helped create the Charles Mix County places including Standard Bridge Company, Wold,A.M.,Construction, Bill Boland, Rising Hail Cooperative Dev. Assoc. and William L. Steele. Prominent architectural styles found in Charles Mix Country are Prairie School, Bungalow/Craftsman and Late Victorian.