Illinois - Area of significance: Architecture
| Granite City YMCA |
| Grant Park |
| Granville-Mott House |
| 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 |
| Greenwood Cemetery Chapel and Crematory |
| Greenwood Cottage |
| Greenwood, The |
| Gridley, Mrs., A. W., House |
| Griffith, John, Store Building |
| Griffiths, John W., Mansion |
| Griggs, Clark R., House |
| Griggsville Historic District |
| Grigsby Estate |
| Groesbeck, Abraham, House |
| Grossdale Station |
| Grosse Point Light Station |
| Grow, Caroline, House |
| Grubbs, Samuel Moody, House |
| Guertler House |
| Gunderson Historic District |
| Gundlach-Grosse House |
| Guyon Hotel |
| Haas, L., Store |
| Haight Village Historic District |
| Haish Memorial Library |
| Halderman, Nathaniel, House |
| Hall, David, House |
| Halsted, Ann, House |
| Hamer, Edward, House |
| Hamer, Patterson, House |
| Hamilton Park |
| Hamilton Primary School |
| Hamilton, Robert W., House |
| Hampshire Colony Congregational Church |
| Hanson, Anton, E., House |
| Harbach, Gerald, Round Barn |
| Harper, John B., House |
| Harrer Building |
| Haskell Playhouse |
| Hatch, William H., House |
| Hauptgebaude |
| Hayward-Hill House |
| Hazel Avenue Prospect Avenue Historic District |
| Health Education Building |
| Healy Chapel |
| Heart Theater |
| Heck, John, House |
| Hegeler-Carus Mansion |
| Hegeler I, Julius W., House |
| Heimberger House |
| Heller, Isadore H., House |
| Henderson, Frank B., House |
| Hennessy, Cornelius, Building |
| Henry County Courthouse |
| Henry, Jacob H., House |
| Henson House |
| Herget, Carl, Mansion |
| Hermitage Apartments |
| Hermosa Bungalow Historic DIstrict |
| Herrick Cobblestone |
| Heurtley, Arthur, House |
| Hibbard, Charles H., House |
| Hibbard, Frank, Estate House-Deerpath Hill Estates |
| Hickox Apartments |
| Hickox, Warren, House |
| Highland Park Water Tower |
| Hillcrest Apartment |
| Hines, Edward Jr., Veterans Administration Hospital Historic District |
| Hinman Apartments |
| Hitchcock, Charles, Hall |
| Hitt, Samuel M., House |
| Hobbs Building |
| Hoblit House |
| Hodges House |
| Hohf, Dr. Robert, House |
| Holcomb, William H., House |
| Holland Apartments |
| Holmes, Samuel, House |
| Holy Cross Church |
| Holy Family Church |
| Holy Name Cathedral |
| Holy Trinity Church Rectory and Convent |
| Holy Trinity Russian Orthodox Cathedral and Rectory |
| Home Bank and Trust Company |
| Homestead, The |
| Hoopes-Cunningham Mansion |
| Hoopes, William, House |
| Hopkinson, Ambrose, House |
| Hossack, John, House |
| Hotel Baker |
| Hotel Del Prado |
| Hotel Kaskaskia |
| Hotel St. Benedict Flats |
| Hotel Windermere East |
Data from United States Park Service and Wikidata
