Ohio - Criteria: C (architecture/engineering)
| Garford, Arthur L., House |
| Garlick, Richard, House |
| Garst House |
| Garst, John, House |
| Garver-Rentschler Barn |
| Gasche, Charles, House |
| Gaskins-Malany House |
| Gast, Matthias, House and General Store |
| Gaston's Mill-Lock No. 36, Sandy And Beaver Canal District |
| Gates, Holsey, House |
| Gates Mills Methodist Episcopal Church |
| Gatewood |
| Gayman, Christian, House |
| Geeting Covered Bridge |
| Gelpi, Eleanor A., House |
| General Hospital Nurses' Home |
| Genoa Town Hall |
| George-Caldwell-Grum Farm |
| Georgetown Historic District |
| Georgetown Public School |
| Gerhart-Rust Residence |
| German Village |
| German Village Historic District |
| Gerrard, Stephen A., Mansion |
| Gertenslager Carriage and Wagon Company |
| Gharky, George H., House |
| Gifford, Dr. William, House |
| Gilbert, F.A., House |
| Gilbert House |
| Gilbert, Philip E., Houses |
| Gilbert Row |
| Gilbert-Sinton Historic District |
| Gilbert-Wilcox House |
| Gilchrist, Capt., House |
| Gilchrist, Capt., Sr., House |
| Gillett-Shoemaker-Welsh House |
| Gill, H., House |
| Gill, John, Farmstead |
| Gill-Luchsinger-Bahnsen House and Barn |
| Gill-Morris Farm |
| Gish Farmhouses |
| Glamorgan |
| Gleason, Edmund, House |
| Glencoe-Auburn Hotel and Clecoe-Auburn Place Row Houses |
| Glendale Cemetery |
| Glendale Historic District |
| Glendower |
| Glen Echo Historic District |
| Glenford Bank |
| Glidden, Francis K., House |
| Glynnwood Catholic Church |
| Godfrey-Johnson House |
| Godfrey, Sen. Thomas J., House |
| Golden Eagle Wine Cellars |
| Golden Lamb |
| Goldsmith, Moses, Building |
| Goll Homestead |
| Goodall Building |
| Gooding House and Tavern |
| Goodwin, Dr. Erastus, House |
| Goodyear Airdock |
| Goodyear Hall-Ohio Savings and Trust Company |
| Gordon Square Building |
| Gorsuch, Ernest J., House |
| Goshorn, Sir Alfred T., House |
| Gothic Building, The |
| Gothic Revival House |
| Gottschall, Oscar M., House |
| Gould Block |
| Governor's Inn |
| Grace Church |
| Grace Reformed Church |
| Graefe, Henry, House |
| Grafton School |
| Graham, William, House |
| Grand Army of the Republic Memorial Hall |
| Grand Lake St. Marys Lighthouse |
| Grand Pacific Hotel |
| Grandview Cemetery |
| Grant, A. G., Homestead |
| Grant-Deneau Tower |
| Grant, William H., House |
| Graphic Arts Building |
| Gray-Coulton House |
| Great American Racing Derby |
| Great Hall |
| Great Southern Hotel and Theatre |
| Great Western Schoolhouse |
| Greene Township Center |
| Green Island Light |
| Green Lawn Abbey |
| Greenlawn Cemetery Chapel |
| Green, Lucius, House |
| Green Plain Monthly Meetinghouse |
| Greenville Mausoleum |
| Greenwood Cemetery |
| Gregg House |
| Gregory House |
| Greyhound Bus Station |
| Griffin, A. B.,-O. H. Griffin House |
Data from United States Park Service and Wikidata
