Ohio - Area of significance: Transportation
| Hill, Jediah, Covered Bridge |
| Hizey Covered Bridge |
| Hocking Valley Railway Historic District |
| Huffman Field |
| Hull-Wolcott House |
| Hune Covered Bridge |
| Huntington Inn, Old |
| Huron Harbor Light |
| Ida Street Viaduct |
| Inter County Highway 360 |
| Interurban Bridge |
| John Bright No. 1 Iron Bridge |
| Kenmore Boulevard Historic District |
| Kent Industrial District |
| Kettering, Charles F., House |
| Keystone Furnace |
| Kidwell Covered Bridge |
| Knowlton Covered Bridge |
| Lake Shore and Michigan Southern (LS&MS) Railroad Depot-Wauseon |
| Lake Shore And Michigan Southern Passenger Depot |
| Lake Shore And Michigan Southern Railroad Depot |
| Lake Shore & Michigan Southern Railroad Station |
| Lange Hotel |
| Lima Pennsylvania Railroad Passenger Depot |
| Lockington Locks Historical Area |
| 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 |
| Lock Tender's House and Inn |
| Lockville Canal Locks |
| Lorain-Carnegie Bridge |
| Lorain Lighthouse |
| Lowellville Railroad Station |
| Main-Market Historic District |
| Marblehead Lighthouse |
| Market Street Section, Retaining Wall and Water Trough |
| Maumee Sidecut |
| Miami-Erie Canal Lock No. 70 |
| Miami-Erie Canal Site Historic District |
| Mill & Dunn Historic District |
| MISSISSIPPI III |
| Mohawk Place Historic District |
| Moonville Tunnel |
| Moore, Edward W. and Louise C., Estate |
| Morristown Historic District |
| Mound City Group National Monument |
| Mount Orab Station |
| Mount Victory Historic District |
| Mt. Olive Road Covered Bridge |
| Murschel House |
| Muskingum River Lock No. 10 And Canal |
| Muskingum River Navigation Historic District |
| National Road |
| Neff, Conrad, House |
| Newport and Cincinnati Bridge |
| New York Central Freight House |
| Niles Car & Manufacturing Company Electric Railway Interurban Combine No. 21 |
| Norfolk and Western Freight Station |
| Norfolk And Western Railroad Depot |
| Oberlin Lake Shore And Michigan Southern Station |
| Ohio and Erie Canal Deep Lock |
| Ohio and Erie Canal Southern Descent Historic District |
| Ohio Canal Groundbreaking Site |
| Old North End Historic District |
| Old Port Columbus Airport Control Tower |
| Old School Privy |
| Orrville Downtown Historic District |
| Outville Depot |
| Oxford Railroad Depot and Junction House |
| Packard, James Ward, House |
| Palos Covered Bridge |
| Parks Covered Bridge |
| Peairs Homestead |
| Peninsula Village Historic District |
| Pennsylvania Depot |
| Pennsylvania House |
| Pennsylvania Railroad Depot And Baggage Room |
| Pennsylvania Railway Ore Dock |
| Pennsylvania Railway Station |
| Peters-Kupferschmid House |
| Pickerington Depot |
| Piqua Historical Area State Memorial |
| Pittsburg, Cincinnati, and St. Louis Depot |
| Prospect Place |
| Rhodes and Watters Apartment Buildings, The |
| Rickenbacker, Capt. Edward V., House |
| Rinard Covered Bridge |
| Roscoe Village |
| Rossville Historic District |
| Roundwood Manor at Daisy Hill Farm |
Data from United States Park Service and Wikidata
