Ohio - Role: Structure
| Huntington, John, Pumping Tower |
| Huron Harbor Light |
| Ida Street Viaduct |
| Indian Run Cemetery Stone Walls |
| Inter County Highway 360 |
| Interurban Bridge |
| Jeffers, H. P., Mound |
| John Bright No. 1 Iron Bridge |
| Johnson Road Covered Bridge |
| Karshner Mound |
| Kidwell Covered Bridge |
| Kinzer Mound |
| Kirker Covered Bridge |
| Knowlton Covered Bridge |
| Lake Hamilton Dam |
| Lebanon Cemetery Entrance Arch |
| Lima Stadium |
| Lockington Covered Bridge |
| Lock No. 26 |
| Lock No. 27 |
| Lock No. 28 |
| Lock No. 29 and Aqueduct |
| Lock No. 30 and Feeder Dam |
| Lock No. 31 |
| Lock No. 32 |
| Lock No. 33 |
| Lock No. 34 |
| Lock No. 35 |
| Lock No. 37 and Spillway |
| Lock No. 38 and Spillway |
| Lock No. 39 and Spillway |
| Lockville Canal Locks |
| Lorain-Carnegie Bridge |
| Luthor List Mound |
| Lynchburg Covered Bridge |
| MAJESTIC |
| Marblehead Lighthouse |
| Marion Cemetery Receiving Vault |
| Market Street Section, Retaining Wall and Water Trough |
| Markham Mound |
| Mark Road Bridge |
| Martinsville Road Covered Bridge |
| Maumee Sidecut |
| McColly Covered Bridge |
| McDaniel Mound |
| McLaughlin Mound |
| Melick Mound |
| Miami And Erie Canal, Deep Cut |
| Mill Creek Park Suspension Bridge |
| Mill Road Bowstring Bridge |
| MISSISSIPPI III |
| Moonville Tunnel |
| Mound Cemetery Mound |
| Mt. Olive Road Covered Bridge |
| Mull Covered Bridge |
| National Road |
| Nettle Lake Mound Group |
| Newport and Cincinnati Bridge |
| Newton Falls Covered Bridge |
| Niles Car & Manufacturing Company Electric Railway Interurban Combine No. 21 |
| Norwood Mound |
| Oberlin Gas Lighting Company Gasholder House |
| Odd Fellows' Cemetery Mound |
| Ohio and Erie Canal Deep Lock |
| Ohio State Route 51 Bridge Over the Portage River |
| Old Elyria Water Tower |
| Old Enon Road Stone Arch Culvert |
| Old Maid's Orchard Mound |
| Olive Furnace |
| Orators Mound |
| O'Shaughnessy Dam and Bridge |
| Palos Covered Bridge |
| Parker Covered Bridge |
| Parks Covered Bridge |
| Perry's Victory and International Peace Memorial |
| Ponn Humpback Covered Bridge |
| Probasco Fountain |
| Pugh's Mill Covered Bridge |
| Ranger Station Mound |
| Reed Covered Bridge |
| Reeves Mound |
| Rinard Covered Bridge |
| Roberts Covered Bridge |
| Rock Mill Covered Bridge |
| Rocky Fork Park Group |
| Rocky Fork Park Site |
| Rodrick Bridge |
| Root Covered Bridge |
| Ross, Edith, Mound |
| Salt Creek Covered Bridge |
| """S"" Bridge II" |
| S Bridge, National Road |
| Scottown Covered Bridge |
| Sherman, John, Memorial Gateway |
| Shinn Covered Bridge |
| SHOWBOAT MAJESTIC |
| Sidaway Bridge |
| Skunk Hill Mounds |
| Smith Road Bridge |
| South Bass Island Light |
Data from United States Park Service and Wikidata
