Illinois - Significance region: Local
| Georgian, The |
| Giant City State Park Lodge and Cabins |
| Giant City Stone Fort Site |
| Gibbs, William and Caroline, House |
| Gifford-Davidson House |
| Gillson Park and Wilmette Harbor Historic District |
| Glasner, William A., House |
| Glen Carbon Grade School |
| Glen Carbon Village Hall and Firehouse |
| Glen Ellyn Downtown North Historic District |
| Glen Ellyn Downtown South Historic District |
| Glen Ellyn Main Street Historic District |
| Glenwood School |
| Goddard Chapel |
| Godfrey, Benjamin, Memorial Chapel |
| Goldblatt Bros. Department Store |
| Gottschalk, Fred, Grocery Store |
| Grafton Bank |
| Grafton Boat Works |
| Grafton Historic District |
| Graham-Ginestra House |
| Grand Crossing Park |
| Grand Theater |
| Grand View Drive |
| Grange Hall |
| Granite City YMCA |
| Gray, William W., House |
| Great Western Railroad Depot |
| Greek Revival Cottage |
| Greeley, Dr. Paul W. and Eunice, House |
| Green Bay Road Historic District |
| Greenlee, Robert, House |
| Greenup Commercial Historic District |
| Greenville Public Library |
| Greenwood Cemetery Chapel and Crematory |
| Gregg, William L., House |
| Gridley, Mrs., A. W., House |
| Griffith, John, Store Building |
| Griffiths, John W., Mansion |
| Griggs, Clark R., House |
| Griggsville Landing Lime Kiln |
| Grigsby Estate |
| Groesbeck, Abraham, House |
| Grossdale Station |
| Gross Point Village Hall |
| Grow, Caroline, House |
| Guertler House |
| Gunderson Historic District |
| Gurler, George H., House |
| Haas, L., Store |
| Haight Village Historic District |
| Haish Memorial Library |
| Halderman, Nathaniel, House |
| Hall, David, House |
| Hamer, Edward, House |
| Hamer, Patterson, House |
| Hamilton Primary School |
| Hamilton, Robert W., House |
| Hampshire Colony Congregational Church |
| Hangar 1, Naval Air Station-Glenview |
| Hanson, Anton, E., House |
| Harbach, Gerald, Round Barn |
| Harlan Hall |
| Harper, John B., House |
| Harrer Building |
| Harrisburg City Hall |
| Hatch, William H., House |
| Havana Public Library |
| Havana Water Tower |
| Hawes, J. H., Elevator |
| Hayward-Hill House |
| Hazen Bridge |
| Health Education Building |
| Healy Chapel |
| Heart Theater |
| Heck, John, House |
| Heimberger 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 |
| Hibbard, Charles H., House |
| Hibbard, Frank, Estate House-Deerpath Hill Estates |
| Hickox Apartments |
| Hickox, Virgil, House |
| Himmelfarb, Samuel and Eleanor House and Studio |
| Hitt, Samuel M., House |
| Hobbs Building |
| Hoblit House |
| Hodges House |
| Hofmann Tower |
| Hohf, Dr. Robert, House |
| Holland Apartments |
| Holy Cross Church |
| Holy Family Church |
| Holy Name Cathedral |
Data from United States Park Service and Wikidata
