Iowa - Criteria: C (architecture/engineering)
| Farmers Savings Bank |
| Farmers' State Bank |
| Farm No. 1, Iowa Men's Reformatory |
| Farnsworth, Shepard and Emma, House |
| Farwell, S. S., House |
| Fayette County Courthouse |
| Fay, Pliny and Adelia, House |
| Feller, Robert William Andrew, Farmstead |
| Fellows, James C., House |
| Fenelon Place Elevator |
| Fenelon Place Residential Historic District |
| Fennern, Henry P., House |
| Ficke Block |
| Fifth Street Bluff Historic District |
| Fillmore Block |
| Finch, Fred, House |
| Findley, William, House |
| Fire Station No. 2 |
| Fire Station No. 4 |
| First Avenue Bridge |
| First Baptist Church of West Union |
| First Church of Christ Scientist |
| First Church of Christ, Scientist |
| 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 Building |
| First National Bank Building |
| First National Bank of Davenport |
| First National Bank of Mason City |
| 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 |
| Fish Creek Bridge |
| 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 |
| Fobes Octagon Barn |
| Foley, John, House |
| Folkert Mound Group |
| Ford, Arthur Hillyer, House |
| Ford, W. T., House |
| Forest Cemetery Entrance |
| Forney, James M., House |
| Forrest Block |
| Fort Atkinson Bridge |
| Fort Dodge Downtown Historic District |
| Fort Dodge Junior High School |
| Fort Dodge Senior High School |
| Fort Madison Bridge |
| 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 |
| 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 |
| Frantz Round Barn |
| Fremont County Courthouse |
| Fremont Mill Bridge |
| Frick's Tavern |
| Fritz Chapel |
| Fuerste House |
| Fuhrman, Mathias C. and Eva B. Crowell, Farm |
| Fuller, W. Joseph, House |
| Gabbert, William, House |
| Gabriel, Rees, House |
| Gallup, George H., House |
| Gamble, James, House |
| Garland House |
| G.A.R. Memorial Hall |
| Garnavillo Township Bridge |
| Garnavillo Township Culvert |
| Garner, J.W., Building |
| Garretson Outlet Bridge |
Data from United States Park Service and Wikidata
