Ohio - Role: Structure
| Adams Covered Bridge |
| Adena Mound |
| Arledge Mounds I and II |
| Ashtabula Harbor Light |
| Ballard Road Covered Bridge |
| Barkhurst Mill Covered Bridge |
| Bell Covered Bridge |
| Belle Hall Covered Bridge |
| Bellville Bandstand |
| Bennett Schoolhouse Road Covered Bridge |
| Bergstresser Covered Bridge |
| Black River Viaduct, Baltimore And Ohio Railroad |
| Blackwood Covered Bridge |
| "Blaine Hill ""S"" Bridge" |
| BOECKLING, G.A., (side-paddlewheel steamboat) |
| Bone Mound II |
| B & O Railroad Viaduct |
| Bowman Mill Covered Bridge |
| Bright, John, Covered Bridge |
| Broadway Bridge |
| Brown, Austin, Mound |
| Brubaker Covered Bridge |
| Buckeye Furnace Covered Bridge |
| Byer Covered Bridge |
| Caledonia Bowstring Bridge |
| Campbell Mound |
| Cannon, Tom, Mound |
| Cedar-Bank Works |
| Chambers Road Covered Bridge |
| Chaney, O. P., Grain Elevator |
| Cherry Valley Coke Ovens |
| Christman Covered Bridge |
| Chuckery Race |
| Church Hill Road Covered Bridge |
| Cincinnati and Whitewater Canal Tunnel |
| Clemmons, W.C., Mound |
| Cleveland And Pittsburgh Railroad Bridge |
| Cleveland East Pierhead Light |
| Cleveland Municipal Stadium |
| Cleveland West Pierhead Light |
| Coe Mound |
| Columbus Country Club Mound |
| Columbus Grove Municipal Pool |
| Conneaut Harbor West Breakwater Light |
| Coon Hunters Mound |
| Copley Township Cemetery Receiving Vault |
| Davis Works |
| Dayton Power And Light Company Mound |
| Dean Road Bridge |
| Deeds Carillon |
| Deffenbaugh, George, Mound |
| Dentzel, William H., 1921 Carousel |
| Dentzel, William H., 1924 Carousel |
| Detroit Avenue Bridge |
| Detroit-Superior High Level Bridge |
| Dey Road Bridge |
| Dixon Mound |
| DONALD B (towboat) |
| Dresden Suspension Bridge |
| Eagle Creek Covered Bridge |
| Eakin Mill Covered Bridge |
| Eden Park Stand Pipe |
| Eldean Covered Bridge |
| Elsinore Arch |
| Eugene McKinley Memorial Pool |
| Fairport Harbor West Breakwater Light |
| Fairport Marine Museum |
| Falls River Road |
| First Concrete Street In U.S. |
| Foreaker Bridge |
| Fortner Mounds I, II |
| FRANCIS, JOSEPH, IRON SURF BOAT |
| Furnace Run Aqueduct |
| Galbreath, John, Mound |
| Garfield, President James A., Memorial |
| Geeting Covered Bridge |
| General U.S. Grant Bridge |
| Glendale Steps |
| Grand Lake St. Marys Lighthouse |
| Great American Racing Derby |
| Harding Tomb |
| Harper Mausoleum and Harper, George W., Memorial Entrance |
| Harpersfield Covered Bridge |
| Harra Covered Bridge |
| Harrison, William Henry, Tomb State Memorial |
| Harshaville Covered Bridge |
| Harshman Covered Bridge |
| Hartley Mound |
| Helmick Covered Bridge |
| Helmick Mill Covered Bridge |
| Hessler Court Wooden Pavement |
| Highbank Park Works |
| Hildreth Covered Bridge |
| Hill, Jediah, Covered Bridge |
| Hizey Covered Bridge |
| Holder-Wright Works |
| Hope Furnace |
| Horn Mound |
| Huffman Covered Bridge |
| Hune Covered Bridge |
Data from United States Park Service and Wikidata
