Oklahoma - Significance region: Local
| Cities Service Station #8 |
| Citizens Bank Building |
| Citizens Bank Tower |
| Citizen's State Bank |
| Citizens State Bank |
| Citizens State Bank |
| City Veterinary Hospital |
| Clapp-Cunningham Building |
| Claremore Auto Dealership |
| Claud Collier Chevrolet & Buick Company |
| Clay Hall |
| Clayton High School-Auditorium |
| Cleary, Jack and Helen, House |
| Cleary, John and Helen, House |
| Clem and Cliff Filling Station |
| Cleveland County Courthouse |
| Clinton Armory |
| Clover Hotel |
| Clyde's Supermarket and T.G.&Y. |
| Coalgate School Gymnasium-Auditorium |
| Cobb Building |
| Cole Chapel School |
| Coleman, George L., Sr., House |
| Colony Park Pavilion |
| Comanche Indian Mission Cemetery |
| Comer, C.A., House |
| Commerce Building/Hancock Building |
| Conklin House |
| Convention Hall |
| Co-Operative Publishing Company Building |
| Cooper, C. L., Building |
| Cordell Carnegie Public Library |
| Corey House/Hotel |
| Corliss Steam Engine |
| Coss, V. R., House |
| Cotton County Courthouse |
| Cotton-Exchange Building |
| Cotton Storage House |
| Cottonwood Community Center |
| Covington Jail |
| Craig County Courthouse |
| Crane Motor Company Building |
| Crawford House |
| Creek Council Tree Site |
| Creek County Courthouse |
| Creek Masonic Lodge No. 226 |
| Crescent School |
| Cronkhite Ranch House |
| Cross, Hamilton, House |
| Cross S Ranch Headquarters |
| Crown Heights Historic District |
| Cupco Church |
| Cushing American Legion Building |
| Cushing Armory |
| Czech Hall |
| Czech Hall of Oklahoma City-Lodge Laska |
| Danholt |
| Daniel Webster High School Historic District |
| Danner, J.W., House |
| Darr School of Aeronautics Hangar No. 3 |
| Davenport Broadway Avenue Brick Street |
| Davis Santa Fe Depot |
| Dawson School |
| Dayton School |
| Deer Creek General Merchandise Store |
| Degnan School |
| Delaware School, District No. 64 |
| Depew Route 66 Segment |
| Dewey County Courthouse |
| Diamond Point Dependent District No. 44 School |
| Dobson Family House |
| Dog Creek School |
| Donahoe, Daniel J., House |
| Dorroh-Trent House |
| Douglas, H. T., Mansion and Garage |
| Douglass High School Auditorium |
| Douglass High School, Old, |
| Douglass School |
| Dow Grain Company Elevator |
| Downtown Altus Historic District |
| Downtown Claremore Historic District |
| Downtown Hobart Historic District |
| Downtown Mangum Historic District |
| Downtown Ponca City Historic District |
| Downtown Tulsa YMCA |
| Dozier Mercantile Building |
| Dresser, Carl K., House |
| Drummond, Fred and Adeline, House |
| Drumright, Aaron, House |
| DuBois, W.E.B., School |
| Dunbar Elementary School |
| Dunbar School |
| Dunbar School |
| Duncan Armory |
| Duncan Public Library |
| Durant Downtown Historic District |
| Dustin Agricultural Building |
| Eason, T. T., Mansion |
| East Central State Normal School |
| Eastern University Preparatory School |
Data from United States Park Service and Wikidata
