| Fairmont Creamery | Davenport | IA |
| Fairmont Creamery | Sioux City | IA |
| Fairmont Foods | Sioux City | IA |
| Farley & Loetscher Manufacturing | Dubuque | IA |
| Farm Bureau Building | Hampton | IA |
| Farm Bureau Building | Des Moines | IA |
| Farm Egg | Humboldt | IA |
| Farm Equipment Manufacturing | Centerville | IA |
| Farmers Elevator Insurance | Des Moines | IA |
| Farmers Mutual Reinsurance Building | Grinnell | IA |
| Farmland Industries | Fort Dodge | IA |
| Federal Saving & Loan Association | Des Moines | IA |
| Finley Hospital | Dubuque | IA |
| Firestone | Des Moines | IA |
| First Congregational Church | Clear Lake | IA |
| First Federal Savings & Loan | Davenport | IA |
| First Federal Savings & Loan | Council Bluffs | IA |
| First Methodist Church | Holstein | IA |
| First Miss | Fort Madison | IA |
| First National Bank | Davenport | IA |
| First Presbyterian Church | Estherville | IA |
| First United Methodist Church | Chariton | IA |
| Fisher Artificial Ice & Cold Storage | Dubuque | IA |
| Fisher Controls | Marshalltown | IA |
| Flora Dunlap School | Des Moines | IA |
| Fluor Corporation | Clinton | IA |
| FMC | Cedar Rapids | IA |
| Ford | Laurens | IA |
| Foster Wheeler | Fort Madison | IA |
| Frank Foundries | Davenport | IA |
| Franklin Apartments | Hampton | IA |
| Franklin Apartments | Des Moines | IA |
| Franklin General Hospital | Hampton | IA |
| Frank L. Smart Junior High School | Davenport | IA |
| French Hecht | Davenport | IA |
| Friends Of Faith Retirement Homes | Waterloo | IA |
| Fust Herman H & Company | Des Moines | IA |
| Galesburg Sr. High School | Davenport | IA |
| Gate City Steel | Davenport | IA |
| General Electric | Burlington | IA |
| General Filter | Ames | IA |
| General Mills | Belmond | IA |
| General Mills | Keokuk | IA |
| General Services Administration | Ames | IA |
| George Neal Station North | Sergeant Bluff | IA |
| George Neal Station South | Salix | IA |
| Georgia Pacific | Fort Dodge | IA |
| Giant Manufacturing | Council Bluffs | IA |
| Glenwood State Hospital School | Glenwood | IA |
| Glenwood State School | Glenwood | IA |
