Iowa - Area of significance: Architecture
| First Church of Christ, Scientist |
| First Congregational Church |
| First Congregational Church |
| First Federal Savings and Loan Association Building |
| First Lutheran Church |
| First Methodist Church |
| First Methodist Episcopal Church |
| First National Bank |
| First National Bank |
| First National Bank |
| First National Bank |
| First National Bank |
| First National Bank |
| First National Bank Building |
| First National Bank Building |
| First National Bank of Davenport |
| First National Bank of Mason City |
| First National Bank of Pomeroy |
| First Presbyterian Church |
| First Presbyterian Church |
| First Presbyterian Church |
| First Presbyterian Church of Marion, Iowa |
| First Unitarian Church |
| First United Brethren Church |
| First United Methodist Church |
| Fish and Game Pavilion and Aquarium |
| Fisher-Plane Commercial Building |
| Fleming Building |
| Fleshman, Charles M. and Emma M. Fischer, House |
| Floral Hall |
| Floral Hall |
| Floyd County Court House |
| Flynn Farm, Mansion, and Barn |
| Foley, John, House |
| Ford, Arthur Hillyer, House |
| Ford, W. T., House |
| Forest Cemetery Entrance |
| 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 |
| Fourth Street Historic District |
| Fowler Company Building, The |
| Franke, C. F., House |
| Franklin Apartments |
| Franklin County Courthouse |
| Franklin County G. A. R. Soldiers' Memorial Hall |
| Franklin County Sheriff's Residence and Jail |
| Franklin Printing House |
| Frankville School |
| Fremont County Courthouse |
| Frick's Tavern |
| Fritz Chapel |
| Front Street (River Park Drive) Historic District |
| Fryer, O.F. and Lulu E., House |
| Fuerste 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 |
| Garland House |
| G.A.R. Memorial Hall |
| Garner, J.W., Building |
| Gaspard, D. Julius, House |
| Gehlen House and Barn |
| Geode State Park, Civilian Conservation Corps Area |
| German Bank |
| German Bank Building of Walnut, Iowa |
| German Evangelical Reformed Church |
| Germania-Miller/Standard Hotel |
| German Methodist Episcopal Church |
| Gibbs, E. H., House |
| Gibson, E. R., House |
| Gilbert-Linn Street Historic District |
| 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 Avenue Historic Commercial District |
| Grand Opera House |
Data from United States Park Service and Wikidata
