Ohio - Role: Building
| Overfield Tavern |
| Overholt House |
| Overmyer Building, The |
| Overmyer-Waggoner-Roush Farm |
| Oviatt, Orson Minot, House |
| Oxford Female Institute |
| Oxford Railroad Depot and Junction House |
| Ozmun, Isaac and Maria, Farmstead |
| Pabodie, Professor William, House |
| Pacific Curios Antiques |
| Packard-Doubler House |
| Packard, James Ward, House |
| Paige, David R., House |
| Painesville City Hall |
| Palace Hotel |
| Palace Theater |
| Palace Theater |
| Palace Theatre |
| Palace Theatre Building |
| Palmer House |
| Palmyra Center Hotel |
| Panek Block |
| Park Avenue Baptist Church |
| Park Building |
| Parker, John P., House |
| Parker, John P., House |
| Park Flats |
| Park, Jonathan, House |
| Parkside Apartments |
| Park Synagogue |
| Parmelee House |
| Partridge, Reuben L. House |
| Pataskala Banking Company |
| Pataskala Elementary School |
| Pataskala Jail |
| Pataskala Presbyterian Church |
| Pataskala Town Hall |
| Pataskala United Methodist Church |
| Patterson, Mary A., Memorial |
| Patterson, Samuel N., House |
| Paulding County Carnegie Library |
| Paulding County Courthouse |
| Paul Hall, Muskingum College |
| Peairs Homestead |
| Pease, George, House |
| Pease Homestead |
| Pebblebrook Farm House and Gardens |
| Peck, Judge William V., House |
| Peck, L. W., House |
| Peerless Motor Company Plant No. 1 |
| Peggy Ann Building |
| Pelton House |
| Pelton, Old, Hotel |
| Pendleton, George Hunt, House |
| Penfield, Louis A., House |
| Pennsylvania Depot |
| Pennsylvania House |
| Pennsylvania Railroad Depot And Baggage Room |
| Pennsylvania Railway Station |
| Peoples Bank Company Building |
| People's Federal Savings and Loan Association |
| Perrill-Goodman Farm House |
| Perry County Courthouse and Jail |
| Perry, Norman Dewey, House |
| Perry-Payne Building |
| Perrysburg Water Maintenance Building |
| Pershing, Christian, Barn |
| Petersburg Mill |
| Peters Cartridge Company |
| Peters-Kupferschmid House |
| Peters, Stevenson, House |
| Pfarr Log House |
| Pfleger Family Houses |
| Pfleiderer Center for Religion and the Humanities |
| Philothea Catholic Church and Priest House |
| Phoenix Block |
| Phoenix Building/Cincinnati Club |
| Phoenix Club |
| Phoenix Mills |
| Piatt, Abram S., House and Piatt, Donn S., House |
| Pickands, Jay M., House |
| Pickerington Carnegie Library |
| Pickerington Depot |
| Picking, D., And Company |
| Pierce, Elijah, Properties |
| Pilgrim Congregational Church |
| Pilgrim Presbyterian Church |
| Pinecroft |
| Pine Meer |
| Pinney, Dr. Eli, House |
| Pinney Road Log Cabin |
| Piqua High School |
| Piqua Historical Area State Memorial |
| Pisgah Christian Church |
| Pitman, Ben, House |
| Pittsburg, Cincinnati, and St. Louis Depot |
| Pitzer, Anthony, Jr., House |
| Plainview Farm |
| Playhouse Square Group |
| Plaza Apartments |
Data from United States Park Service and Wikidata
