Illinois - Criteria: A (event)
| Flanders House |
| Flat Iron Building |
| Flower, Lucy, Technical High School for Girls |
| Foley, Jennie, Building |
| Ford Airport Hanger |
| Forest, The, and Annex |
| Fort Armstrong Hotel |
| Fort Armstrong Theatre |
| Fort Dearborn Hotel |
| Fort de Chartres |
| Fort Sheridan Historic District |
| Forum, The |
| Fountain Plaza Apartments |
| Fox River House |
| France Hotel |
| Franklin County Jail |
| Franklin Square |
| French Colonial Historic District |
| Fuller Park |
| Fulton Commercial Historic District |
| Gale, Mrs. Thomas H., House |
| Galesburg Historic District |
| Galva Opera House |
| Gamma Phi Beta Sorority House |
| Garden Homes Historic District |
| Garfield Elementary School |
| Garfield Farm and Tavern |
| Garfield Park |
| GAR Memorial Building |
| Garrison School |
| General Dean Suspension Bridge |
| Geneva Country Day School |
| Germania Club |
| Glen Carbon Grade School |
| Glen Carbon Village Hall and Firehouse |
| Glen Ellyn Downtown North Historic District |
| Glen Ellyn Downtown South Historic District |
| Godfrey, Benjamin, Memorial Chapel |
| Golconda Historic District |
| Goldblatt Bros. Department Store |
| Gold Coast Historic District |
| Grafton Historic District |
| Grand Crossing Park |
| Grand Theater |
| Grand Tower Mining, Manufacturing and Transportation Company Site |
| Grange Hall |
| Granite City YMCA |
| Grant Park |
| Gray-Watkins Mill |
| Great Lakes Naval Training Station |
| Great Western Railroad Depot |
| Green Bay Road Historic District |
| Greenup Commercial Historic District |
| Greenville Public Library |
| Greenwood Cemetery Chapel and Crematory |
| Greenwood Cottage |
| Greenwood, The |
| Gregg, William L., House |
| Griggsville Landing Lime Kiln |
| Grossdale Station |
| Grosse Point Light Station |
| Gross Point Village Hall |
| Guertler House |
| Gunderson Historic District |
| Haight Village Historic District |
| Hamilton Park |
| Hangar 1, Naval Air Station-Glenview |
| Harbach, Gerald, Round Barn |
| Harlan Hall |
| Harrer Building |
| Harrisburg City Hall |
| Hauge Lutheran Church |
| Hauptgebaude |
| Havana Public Library |
| Havana Water Tower |
| Hawes, J. H., Elevator |
| Haymarket Martyrs' Monument |
| Health Education Building |
| Healy Chapel |
| Hegeler-Carus Mansion |
| Heimberger House |
| Hennepin Canal Historic District |
| Henry County Courthouse |
| Hermosa Bungalow Historic DIstrict |
| Herrick Cobblestone |
| Hibbard, Frank, Estate House-Deerpath Hill Estates |
| Hickox Apartments |
| Hillcrest Apartment |
| Hines, Edward Jr., Veterans Administration Hospital Historic District |
| Hinman Apartments |
| Hofmann Tower |
| Holy Trinity Church Rectory and Convent |
| Home Bank and Trust Company |
| Homestead, The |
| Hoopeston Carnegie Public Library |
| Hotel Arthur |
| Hotel Aurora |
| Hotel Belleville |
| Hotel Del Prado |
| Hotel Kaskaskia |
Data from United States Park Service and Wikidata
