Ohio - Area of significance: Architecture
| Fort Piqua Hotel |
| Fort, The |
| Foster-Gram House |
| Fostoria Downtown Historic District |
| Fostoria Mausoleum |
| Founders Hall, Heidelberg College |
| Fountain City Historic District |
| Fourth Street Historic District |
| Fowler Center Historic District |
| Fowler's Mills Historic District |
| Fox-Pope Farm |
| France Hall |
| Frances Apartment Building |
| Frank, Charles, House And Store |
| Franklin Boulevard Historic District |
| Franklin Boulevard-West Clinton Avenue Historic District |
| Franklin College Building No. 5 |
| Franklin Historic District |
| Franklin Park Conservatory |
| Franklinton Apartments at Broad and Hawkes |
| Franklinton Apartments at State and May |
| Frantz House |
| 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 |
| Fridley-Oman Farm |
| Friedlander, Abraham J., House |
| Friendly Grove |
| Friends Boarding School and Ohio Yearly Meetinghouse Historic District |
| Friends Meetinghouse |
| Froelich, John, House |
| Fuller-Bramley House |
| Fuller, Frances Ensign, House |
| Fuller House |
| Fulton County Courthouse |
| Fulton Farm |
| Fulton Lodge No. 248 |
| Furnace Run Aqueduct |
| Gabel, Daniel, House |
| Gaensslen, Phillip, House |
| Galigher, James, House |
| Gallagher Building |
| Gallipolis Historic District |
| Gallipolis Public Square and Garden Lots Historic District |
| Gambier Historic District |
| Gantz Homestead |
| Gardner House |
| Garfield-Broad Apartments |
| Garfield, Halsey, House |
| Garfield, James A., House |
| Garfield Library |
| Garfield, Milton, House |
| Garfield, President James A., Memorial |
| Garfield Terrace Apartments |
| 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 Historic District |
| Gates Mills Methodist Episcopal Church |
| Gates Mills Village Historic District |
| Gatewood |
| Gayer, Jacob, House |
| Gayer, Jacob M., House |
| Gayman, Christian, House |
| Gelpi, Eleanor A., House |
| General Hospital Nurses' Home |
| General U.S. Grant Bridge |
| Genoa Town Hall |
| George-Caldwell-Grum Farm |
| Georgetown Historic District |
| Georgetown Public School |
| Gerhart-Rust Residence |
| German Evangelical Protestant Cemetery Chapel |
| German Village |
| German Village Historic District |
| Gerrard, Stephen A., Mansion |
| Gertenslager Carriage and Wagon Company |
| Gharky, George H., House |
| Gibson 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 |
Data from United States Park Service and Wikidata
