Iowa - Significance region: Local
| Ford, Arthur Hillyer, House |
| Ford, W. T., House |
| Forest Cemetery Entrance |
| Forest Grove School No. 5 |
| Forest Park Historic District |
| Former US Post Office Building |
| Forney, James M., House |
| Forrest Block |
| Fort Dodge Downtown Historic District |
| Fort Dodge Junior High School |
| Fort Dodge Senior High School |
| Fort Madison Downtown Commercial Historic District |
| Fort Madison High School |
| Foster/Bell House |
| Foster Park Historic District |
| Four Mounds Estate Historic District |
| Four Mounds Site |
| Fourth Street Historic District |
| Fowler Company Building, The |
| Franklin Apartments |
| Franklin County Sheriff's Residence and Jail |
| Franklin Hotel |
| Franklin Printing House |
| Franklin Regular Baptist Church |
| Frankville School |
| Fred Maytag Park Historic District |
| Fremont County Courthouse |
| Frick's Tavern |
| Friedl Bakery Building |
| Fritz Chapel |
| Fryer, O.F. and Lulu E., House |
| Fuhrman, Mathias C. and Eva B. Crowell, Farm |
| Fuller, W. Joseph, House |
| Fulton, Fred and Rosa, Barn |
| Gabbert, William, House |
| Gabriel, Rees, House |
| Gallup, George H., House |
| Gamble, James, House |
| Gannon, M. V., House |
| Garland House |
| G.A.R. Memorial Hall |
| Garner, J.W., Building |
| Garretson, Owen A. and Emma J., House |
| Gaspard, D. Julius, House |
| Gehlen House and Barn |
| German Bank Building of Walnut, Iowa |
| German Evangelical Reformed Church |
| Germania-Miller/Standard Hotel |
| German Methodist Episcopal Church |
| Gibbs, E. H., House |
| Gilbert-Linn Street Historic District |
| Gillette, Guy M. and Rose (Freeman), House |
| Gingrich, Clement B., House |
| Glaspell, Isaac, House |
| Glick-Sower House |
| Gobble and Heer-Spurgeons Building |
| Godard, Milton, House |
| Goddard Bungalow Court Historic District |
| Goering, Jacob, House |
| Goode, Lowry W., and Hattie N., First North Des Moines House |
| Goodnow Hall |
| Goodrich, William T., House |
| Gordon-Van Tine Company Historic District |
| Graceland Cemetery Chapel |
| Grace Methodist Episcopal Church |
| Graham Park Historic District |
| Grand Auditorium and Hotel Block |
| Grand Mound Town Hall and Waterworks Historic District |
| Grand View College (Old Main) |
| Grandview Park Music Pavilion |
| Granger House |
| Grant Commercial Historic District |
| Grant Vocational High School |
| Greater Second Street Historic District |
| Greek Orthodox Church of Saint George |
| Greene County Courthouse |
| Greenfield Public Square Historic District |
| Green, William, House |
| Greenwood Cemetery Chapel |
| Greenwood Park Plats Historic District |
| Grilk, Charles, House |
| Grinnell Herald Building |
| Grinnell Historic Commercial District |
| Grinnell, Levi P., House |
| Griswold National Bank |
| Grocers Wholesale Company Building |
| Grundy Center High School |
| Grundy County Courthouse |
| Gruwell and Crew General Store |
| Guiberson House |
| Guy, Finley, Building |
| Haberkorn House and Farmstead |
| Haley, F.E., Double House |
| Hallett Flat-Rawson & Co. Apartment Building |
| Hall, Hannah Morse Fowler, House |
| Hall, Israel, House |
| Hamburg Historic District |
| Hamburg Historic District |
| Hamilton Brothers Building |
| Hampton Double Square Historic District |
Data from United States Park Service and Wikidata
