Ohio - Area of significance: Invention
| American Felsol Company Building |
| Baker Motor Vehicle Company Building |
| Barrett, George, Concrete House |
| Barretts Mills |
| Bell, C.S., Foundry and Showroom |
| Bell Mansion |
| Bell's First Home |
| Bell's Opera House |
| Bepler, August, House |
| Bookwalter, Francis, House |
| Bruce-Macbeth Engine Company |
| Bush Street Historic District |
| Deeds' Barn |
| DeVilbiss Manufacturing Building |
| Edison, Thomas Alva, Birthplace |
| Fifth and Lawrence Streets Residential District |
| Firestone Tire and Rubber Company |
| Gendron, Peter, House |
| Goodyear Tire and Rubber Company Headquarters |
| Hawthorn Hill |
| Haydenville Historic Town |
| Hinde, James J., House |
| Hoover Company Historic District |
| Hoover Farm |
| Huffman Field |
| Joyce, Jacob O., House |
| Kettering, Charles F., House |
| Kilgour, Frederick G., House |
| Kirby, James, Mill |
| Lion Knitting Mills |
| Lisbon Historic District |
| McLain-Gillmer House |
| Merrill, Edwin H., House |
| Miner's Supply Store |
| Morgan, Garrett, House |
| Mueller Electric Company Building |
| Normandy Farms |
| Oregon Historic District |
| Packard, James Ward, House |
| Parker, John P., House |
| Parker, John P., House |
| Pennsylvania Railway Ore Dock |
| Peters Cartridge Company |
| Phoenix Mills |
| Pinecroft |
| Selle Gear Company |
| Sidney Waterworks And Electric Light Building |
| Smith, Samuel, House And Tannery |
| South Main Street District |
| Tinnerman Steel Range Company |
| Tytus, John B., House |
| West Third Street Historic District |
| White Bridge |
| William Tricker Inc. Historic District |
| Wright Cycle Company-Wright and Wright Printing Offices |
| Wright Flyer III |
Data from United States Park Service and Wikidata
