McClain County Oklahoma has 5 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include US Highway 77 Bridge at Canadian River, Harris Palace Store, Hotel Love, McClain County Courthouse.
Some of the country's most noteable architects helped create the McClain County places including Guy H. James, Hawk & Parr and Cowen Bros.. Prominent architectural styles found in McClain Country are Chicago Style, Commercial Style and Early Modern.