Oklahoma - Area of significance: Architecture
| Newkirk Central Business District |
| Newkirk Water Purification Plant |
| New State School |
| Nichols Park |
| Nickel Ensor McClure House |
| Nickles Machine Shop |
| Noble County Courthouse |
| Noble Hotel |
| Norman Historic District |
| Norman Public Library |
| Northside Elementary School |
| Norton-Johnson Buick Company |
| Nowata County Courthouse |
| Oakland School |
| Okeene Service Station |
| Okemah Armory |
| Okfuskee County Courthouse |
| Oklahoma A & M College Agronomy Barn and Seed House |
| 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 College for Women Historic District |
| Oklahoma County Courthouse |
| Oklahoma Gas and Electric Company Building |
| Oklahoma Hardware Building |
| Oklahoma Historical Society Building |
| Oklahoma National Guard Armory |
| Oklahoma Natural Gas Company Building |
| Oklahoma Odd Fellows Home at Checotah |
| Oklahoma Publishing Company Building |
| Oklahoma State Bank Building |
| OKLA Theater |
| Okmulgee Armory |
| Okmulgee Country Club and Golf Course |
| Okmulgee County Courthouse |
| Okmulgee Downtown Historic District |
| Okmulgee Public Library |
| Okmulgee Stock Pavilion |
| Old Atoka State Bank |
| Old City Hall, Theater and Masonic Lodge |
| Old Washington County Courthouse |
| Oleson-Crane Building |
| Oologah Bank |
| Optima Grain Elevator |
| Osage Bank of Fairfax |
| Osage County Courthouse |
| Osler Building |
| Ottawa County Courthouse |
| Overholser House |
| Overstreet House |
| Pachyderm Building for the Lincoln Park Zoo |
| Page Memorial Library |
| Page Soddy |
| Panola High School and Gymnasium |
| Parker, Quanah, Star House |
| Park Etude |
| Parkside Elementary School |
| Parriott, Foster B., House |
| Paseo Neighborhood Historic District |
| Patterson, A. W., House |
| Pauls Valley Historic District |
| Pawhuska Armory |
| Pawhuska Downtown Historic District |
| Pawnee Agency and Boarding School Historic District |
| Pawnee Armory |
| Pawnee County Courthouse |
| Pawnee Municipal Swimming Pool and Bathhouse |
| Payne County Courthouse |
| Penick House |
| Perkins Downtown Historic District |
| Perry Armory |
| Perry Courthouse Square Historic District |
| Perry Lake Park |
| Perryman Ranch Headquarters |
| Petroleum Building |
| Philcade Building |
| Phillips 66 Station #473 |
| Phillips 66 Station No. 1423 |
| Phillips, Frank and Jane, House |
| Phillips, Waite, Mansion |
| Philtower |
| Pierce Block |
| Pilgrim Congregational Church |
| Pioneer Building |
| Pittsburg County Courthouse |
| Pittsburg School and Gymnasium |
| Platt National Park Historic District |
| Plaza Court |
| Pocasset Gymnasium |
| Pollock, Donald, House |
| Poncan Theatre |
| Pond Creek Masonic Lodge #125 |
| Pontotoc County Courthouse |
| Post Office, Courthouse, and Federal Office Building |
| Poteau Community Building |
| Poteau School Gymnasium-Auditorium |
| Pottawatomie County Courthouse |
| Prague City Hall and Jail |
Data from United States Park Service and Wikidata
