Ohio - Area of significance: Commerce
| Dayton Terra-Cotta Historic District |
| Dayton View Historic District |
| Dayton Women's Club |
| Defiance Downtown Historic District |
| Demand-Gest House |
| Detwiller, John, Tavern and Farmstead |
| Dewalt Building |
| Diamond Historic District |
| Dilger Store |
| Diver, John, House and Storebuilding |
| Dixon-Globe Opera House-Robinson-Schwenn Building |
| Downing, John, Jr., House |
| Downtown Ashland Historic District |
| Downtown Bellefontaine Historic District |
| Downtown Dayton Historic District |
| Downtown Ironton Historic District |
| Downtown Mansfield Historic District |
| Downtown Mount Vernon Historic District |
| Downtown Oberlin Historic District |
| Downtown Painesville Historic District |
| Downtown Sandusky Commercial Historic District |
| Downtown Tiffin Historic District |
| Downtown Van Wert Historic District |
| Downtown Willoughy Historic District |
| Downtown Xenia Historic District |
| Downtown Zanesville Historic District |
| Duane Block |
| Dublin High Street Historic District |
| Dunham Tavern |
| East Fifth Street Historic District |
| East Liverpool Downtown Historic District |
| East Main Street Historic District |
| East Main Street Historic District |
| East Main Street Historic District |
| East Ohio Building, The |
| East Ohio Gas Company Building |
| East Second Street District |
| East Side Commercial Block |
| East Third Street Historic District |
| East Toledo Main Street Historic District |
| Edward Wren Company Building |
| Elson-Magnolia Flour Mill |
| Elyria Downtown-West Avenue Historic District |
| Englebry's Dry Goods |
| Erie County Bank Building |
| Etna House |
| Euclid Avenue Historic District |
| Euclid Heights Historic District |
| Euclid, The-Seventy-First Street Building |
| Euphemia Inn and Tavern |
| Fairmont Creamery Company Ice Cream Building |
| Fairport Marine Museum |
| Farmers Branch, State Bank of Ohio |
| Federal Building |
| Feick Building |
| Fifth Avenue and North High Historic District |
| Findlay Downtown Historic District |
| Findlay Market Building |
| Firestone Tire and Rubber Company |
| First National Bank Building |
| First National Bank Tower |
| Forsythe-Puhl House |
| Fort Ball-Railroad Historic Disrict |
| Fort Industry Square |
| Fort Piqua Hotel |
| Fostoria Downtown Historic District |
| Fountain Hotel, The |
| Fowler's Mills Historic District |
| FRANCIS, JOSEPH, IRON SURF BOAT |
| Frank, Charles, House And Store |
| Franklin Historic District |
| Franklinton Apartments at Broad and Hawkes |
| Franklinton Apartments at State and May |
| Friedlander, Abraham J., House |
| Furnace Run Aqueduct |
| Gaensslen, Phillip, House |
| Gaetz Music House |
| Gallagher Building |
| Gallipolis Historic District |
| Gallipolis Public Square and Garden Lots Historic District |
| Gardner House |
| Garst House |
| Gartner Mound and Village Site |
| Garver Brothers Store |
| Gast, Matthias, House and General Store |
| Gaston's Mill-Lock No. 36, Sandy And Beaver Canal District |
| Gates, Holsey, House |
| Gayman, Christian, House |
| Georgetown Historic District |
| German Village Historic District |
| Ghent Historic District |
| Gibson House |
| Gilboa Main Street Historic District |
| Gooding House and Tavern |
| Goodyear Tire and Rubber Company Headquarters |
| Gordon Square Historic District |
| Gould Block |
| Grand Pacific Hotel |
| Graphic Arts Building |
| Great Lakes Historical Society Marine Museum |
Data from United States Park Service and Wikidata
