Oklahoma - Significance region: Local
| Mullendore Mansion |
| Mulvey Mercantile |
| Municipal Auditorium |
| Murphy, George A., House |
| Murphy House |
| Murray County Courthouse |
| Muskogee County Courthouse |
| Muskogee Depot and Freight District |
| Muskogee Municipal Building |
| Mutual Savings and Loan Association Building |
| Nagle Site |
| Nancy Taylor No. 1 Oil Well Site |
| Narcissa D-X Gas Station |
| Nash-Swindler House |
| New Cordell Courthouse Square Historic District |
| New Hope Baptist Church |
| Newkirk Central Business District |
| Newkirk Water Purification Plant |
| Newport Hotel and Restaurant |
| New State School |
| Nichols Park |
| Nickel Ensor McClure House |
| Nickles Machine Shop |
| Nine Tribes Tower |
| Noble County Courthouse |
| Noble Hotel |
| Norman City Park New Deal Resources |
| Norman Public Library |
| North Cheyenne Avenue Historic District |
| Northside Elementary School |
| Norton-Johnson Buick Company |
| Nowata County Courthouse |
| Nuckolls House |
| Oakland School |
| Oil Capital Historic District |
| Okeene Flour Mill |
| Okeene Service Station |
| Okemah Armory |
| Okfuskee County Courthouse |
| Oklahoma A&M College Dairy Barn |
| Oklahoma Center for Continuing Education Historic District |
| Oklahoma City Ford Motor Company Assembly Plant |
| Oklahoma City Municipal Building |
| Oklahoma City Schools Administration Building |
| Oklahoma County Courthouse |
| Oklahoma County Home for Girls |
| Oklahoma Hardware Building |
| Oklahoma Historical Society Building |
| Oklahoma Natural Gas Company Building |
| Oklahoma, New Mexico and Pacific Railroad Depot |
| Oklahoma State Bank Building |
| OKLA Theater |
| Okmulgee Armory |
| Okmulgee Colored Hospital |
| Okmulgee Country Club and Golf Course |
| Okmulgee County Courthouse |
| Okmulgee Downtown Historic District |
| Okmulgee Public Library |
| Okmulgee Stock Pavilion |
| Oktaha School |
| Old Atoka State Bank |
| Old City Hall, Theater and Masonic Lodge |
| Old Plant Office Building, U.S. Gypsum Co. |
| Old Salt Works |
| Old Santa Fe Railroad Bridge |
| Old Settler's Irrigation Ditch |
| Old Washington County Courthouse |
| Oleson-Crane Building |
| Olustee Public Library and Park |
| Oologah Bank |
| Oologah Pump |
| Opera Block |
| Optima Grain Elevator |
| Osage Bank of Fairfax |
| Osage County Courthouse |
| Osler Building |
| Ottawa County Courthouse |
| Overstreet House |
| Owen Park Historic District |
| Owl Blacksmith Shop |
| Ozark Trails Section of Route 66 |
| Pachyderm Building for the Lincoln Park Zoo |
| Page Memorial Library |
| Page Soddy |
| Panola High School and Gymnasium |
| Parker, Quanah, Star House |
| Park Etude |
| Parkinson, Amos, House |
| Parkinson, Frederick, House |
| Parkside Elementary School |
| Parriott, Foster B., House |
| Paseo Neighborhood Historic District |
| Patterson, A. W., House |
| Patterson Hospital |
| Pawhuska Armory |
| Pawhuska Downtown Historic District |
| Pawnee Agency and Boarding School Historic District |
| Pawnee Armory |
| Pawnee County Courthouse |
| Pawnee Municipal Swimming Pool and Bathhouse |
Data from United States Park Service and Wikidata
