Ohio - Criteria: C (architecture/engineering)
| Firestone, Charles E., House |
| First Baptist Church |
| First Church of Christ in Euclid |
| First Church of Christ Scientist |
| First Church of Christ, Scientist |
| First Church of Christ, Scientist |
| First Church Of Christ, Scientist |
| First Concrete Street In U.S. |
| First Congregational Church |
| First Congregational Church |
| First Congregational Church |
| First Congregational Church And Lexington School |
| First Congregational Church of Cuyahoga Falls |
| First Congregational-Unitarian Church |
| First English Lutheran Church |
| First German Methodist Episcopal Church |
| First Hancock County Courthouse |
| First Lutheran Church |
| First Methodist Church |
| First Methodist Episcopal Church |
| First Methodist Episcopal Church |
| First Methodist Episcopal Church of Alliance, Ohio |
| First Methodist Episcopal-Holy Trinity Greek Orthodox Church |
| First National Bank and Trust Building |
| First National Bank Building |
| First National Bank Building |
| First National Bank Building |
| First National Bank Building |
| First National Bank Tower |
| First Presbyterian Church |
| First Presbyterian Church |
| First Presbyterian Church |
| First Presbyterian Church Of Maumee Chapel |
| First Presbyterian Church of Wapakoneta |
| First Unitarian Church Of Marietta |
| First United Methodist Church |
| First United Methodist Church |
| First United Methodist Church |
| First Universalist Church |
| First Universalist Church of Olmsted |
| Fisher, E.D., House |
| Fitz Randolph-Rogers House |
| Five Mile House |
| Five Oaks |
| Floral Hall |
| Floraville Historic District |
| Florence Corners School |
| Flory, Joseph, House |
| Follett-Moss-Moss Residences |
| Foor-Alspach House |
| Ford Motor Company Cincinnati Plant |
| Ford Motor Company Cleveland Plant |
| Foreaker Bridge |
| Forest City Bank Building |
| Forest Hill Historic District |
| Forest Hill Park |
| Forest Hill Realty Sales Office |
| Forest Lawn Memorial Park |
| Forsythe-Puhl House |
| Fort Hayes |
| Fort Piqua Hotel |
| Fort, The |
| Fostoria Mausoleum |
| Founders Hall, Heidelberg College |
| France Hall |
| Frances Apartment Building |
| Frank, Charles, House And Store |
| Franklin College Building No. 5 |
| Franklin Park Conservatory |
| Franklinton Apartments at Broad and Hawkes |
| Franklinton Apartments at State and May |
| Fraser House |
| Frasier, Thomas T. and Wesley B. Houses |
| Frazee, Stephen, House |
| Fredericktown Presbyterian Church |
| Freedom Congregational Church |
| Free Will Baptist Church Of Auburn |
| French, Garnet B., House |
| Freund-Heintz House |
| Friedlander, Abraham J., House |
| Friendly Grove |
| Friends Meetinghouse |
| Froelich, John, House |
| Fuller-Bramley House |
| Fuller, Frances Ensign, House |
| Fuller House |
| Fulton County Courthouse |
| Fulton Farm |
| Furnace Run Aqueduct |
| Gabel, Daniel, House |
| Gaensslen, Phillip, House |
| Galigher, James, House |
| Gantz Homestead |
| Gardner House |
| Garfield-Broad Apartments |
| Garfield, Halsey, House |
| Garfield, James A., House |
| Garfield Library |
| Garfield, Milton, House |
| Garfield, President James A., Memorial |
Data from United States Park Service and Wikidata
