Ohio - Area of significance: Industry
| Ford Motor Company Cincinnati Plant |
| Ford Motor Company Cleveland Plant |
| Forest City Brewery |
| Fort Ball-Railroad Historic Disrict |
| Foster, Claud, House |
| Foster-Gram House |
| Fowler's Mills Historic District |
| Fox's Brewery-Diamond Wine Co. |
| Garford, Arthur L., House |
| Gartner Mound and Village Site |
| Gendron, Peter, House |
| German Village Historic District |
| Gertenslager Carriage and Wagon Company |
| Ghent Historic District |
| Gibson House |
| Glamorgan |
| Globe Iron Works Building |
| Globe Machine and Stamping Company |
| Godman, H.C., Co. Building |
| Godwin-Knowles House |
| Golden Eagle Wine Cellars |
| Goodyear Airdock |
| Goodyear Hall-Ohio Savings and Trust Company |
| Goodyear Tire and Rubber Company Headquarters |
| Gorsuch, Ernest J., House |
| Griffin, Alexander B., House |
| Grinnell Mill Historic District |
| Grossman Paper Box Company |
| Gruen Watch Company-Time Hill |
| Gwinn Estate |
| Hanna House |
| Hanson Machinery Company |
| Harding-Jones Paper Company District |
| Harmar Historic District |
| Harper-Cosgrave Block |
| Harris, William B., House |
| Harvard Company-Weber Dental Manufacturing Company |
| Hedges-Hunter-Keller-Bacon Gristmill |
| Henn, Albert W., Mansion |
| Hercules Motors Corporation Industrial Complex |
| Hess, Elmer, House |
| Hillsboro Historic Business District |
| Hinde & Dauch Paper Co. |
| Hinde & Dauch Paper Co. |
| Hinde & Dauch Paper Co. |
| Hobart Circle Historic District |
| Hobart, E. A., House |
| Hobart, William, Vacation House |
| Hocking Valley Coal Company Town Historic District |
| Hocking Valley Railway Historic District |
| Hoover Company Historic District |
| Hope Furnace |
| Hopkins, Benjamin F., Stone Building |
| House at 1022 West Main Street |
| House at 121 South Ridge |
| House at 129 South Ridge |
| House at 145 South Ridge |
| House at 203 Penn Road |
| Hudson Avenue Historic District |
| Hull, Jasper G., House |
| Hunter, William, House |
| Imperial Glass Company |
| Indian Mill |
| Jacobs, Felix A., House |
| Jaeger Machine Company Office Building |
| Jaite Mill Historic District |
| Jeffrey, Malcolm, House |
| Jeffrey Manufacturing Company Office Building |
| Johnson Steel Street Railway Company General Offices Building |
| Joseph and Feiss Clothcraft Shops, The |
| Joyce, Jacob O., House |
| Julian and Kokenge Company |
| Kearns, George and Edward, Houses |
| Kent Industrial District |
| Kettering, Charles F., House |
| Keystone Furnace |
| King, Ahimaaz, House |
| King, George W., Mansion-Etowah |
| Kirby, Josiah, House |
| Kister Mill |
| Kundtz, Theodor, Company Building |
| Lake Hamilton Dam |
| Lambert-Parent House |
| Landers Brothers Company Building |
| Lane's Mill Historic Buildings |
| Lanterman Mill |
| Laughlin, Homer, House |
| Lay, Samuel, House |
| Lebanon Cemetery Entrance Arch |
| Lee, Samuel, House |
| L. Hoster Brewing Company |
| Libbey, Edward D., House |
| Lilienthal Building |
| Lion Knitting Mills |
| Liquid Carbonic Corporation Dry Ice Plant |
| Longwood Manor |
| Lorain Lighthouse |
| Lubal Manufacturing and Distributing Company, The |
| Ludowici Roof Tile Company Historic District |
| Ludwig, Isaac R., Historical Mill |
Data from United States Park Service and Wikidata
