Illinois - Criteria: C (architecture/engineering)
| First National Bank Building |
| First Presbyterian Church |
| First State Bank of Manlius |
| First Universalist Church |
| Fischer Theater |
| Fisher Building |
| Fisher Building-Latham Block |
| Fisher-Chapman Farmstead |
| Fisher-Nash-Griggs House |
| Fithian House |
| Fitzpatrick House |
| Flagg, Cornelius, Farmstead |
| Flagg Township Public Library |
| Flamingo-On-The-Lake Apartments |
| Flanagan, Judge, Residence |
| Flanders House |
| Flat Iron Building |
| Fletcher, Ruffin Drew, House |
| Florsheim, Harold, House |
| Flower, Lucy, Technical High School for Girls |
| Foley, Jennie, Building |
| Foley, Stephan A., House |
| Ford Airport Hanger |
| Ford, Sam and Ruth Van Sickle, House |
| Forest, The, and Annex |
| Fort Armstrong Hotel |
| Fort Armstrong Theatre |
| Fort Dearborn Hotel |
| Fort Sheridan Historic District |
| Forum, The |
| Fountain Creek Bridge |
| Fountain Plaza Apartments |
| Four Nineteen Building |
| Fourth Presbyterian Church of Chicago |
| France Hotel |
| Francis, Frederick, Woodland Palace |
| Frangenheim, William, House |
| Franklin Square |
| Frank Lloyd Wright-Prairie School of Architecture Historic District |
| Franks, Charles, House |
| Freeman-Brewer-Sawyer House |
| Freeman, Clarkson W., House |
| French Colonial Historic District |
| Fulkerson, Col. William H., Farmstead |
| Fuller Park |
| Fuller, R. Buckminster, and Anne Hewlett Dome Home |
| Fulton Commercial Historic District |
| Gage Group-Ascher, Keith, and Gage Buildings |
| Gale, Judge Jacob, House |
| Galesburg Historic District |
| Gale, Walter, House |
| Garfield Farm and Tavern |
| Garfield Park |
| GAR Memorial Building |
| Garrison-Coronado-Haskill Historic District |
| Garvey, Hugh M., House |
| Gauler, John, Houses |
| Geister, Christian, House |
| General Dean Suspension Bridge |
| Geneva Country Day School |
| George, G.J., House |
| George, Ron, Round Barn |
| Georgian, The |
| Germania Club |
| Getty Tomb |
| Geyso, Mrs. Frank, Houses |
| Giant City State Park Lodge and Cabins |
| Gibbs, William and Caroline, House |
| Gifford-Davidson House |
| Glasner, William A., House |
| Glen Ellyn Downtown North Historic District |
| Glen Ellyn Downtown South Historic District |
| Glen Ellyn Main Street Historic District |
| Glessner, John J., House |
| Goddard Chapel |
| Godfrey, Benjamin, Memorial Chapel |
| Golconda Historic District |
| Goldblatt Bros. Department Store |
| Gold Coast Historic District |
| Gottschalk, Fred, Grocery Store |
| Graceland Cemetery |
| Grafton Bank |
| Grafton Historic District |
| Graham Building |
| Graham-Ginestra House |
| Grand Army of the Republic Memorial Hall |
| Grand Crossing Park |
| Grand Theater |
| Grand View Drive |
| Granite City YMCA |
| Grant Park |
| Granville-Mott House |
| Graue Mill |
| Gray, William W., House |
| Great Lakes Naval Training Station |
| Greek Revival Cottage |
| Greeley, Dr. Paul W. and Eunice, House |
| Green Bay Road Historic District |
| Greenlee, Robert, House |
| Greenup Commercial Historic District |
Data from United States Park Service and Wikidata
