Illinois - Role: Building
| Gray, William W., House |
| Great Western Railroad Depot |
| Greek Revival Cottage |
| Greeley, Dr. Paul W. and Eunice, House |
| Greenlee, Robert, House |
| Greenville Public Library |
| Greenwood Cemetery Chapel and Crematory |
| Greenwood Cottage |
| Greenwood, The |
| Gregg, William L., House |
| Gridley, Mrs., A. W., House |
| Grierson, Gen. Benjamin Henry, House |
| Griffith, John, Store Building |
| Griffiths, John W., Mansion |
| Griggs, Clark R., House |
| Grigsby Estate |
| Groesbeck, Abraham, House |
| Grossdale Station |
| Gross Point Village Hall |
| Grow, Caroline, House |
| Grubbs, Samuel Moody, House |
| Guertler House |
| Gundlach-Grosse House |
| Gurler, George H., House |
| Guyon Hotel |
| Haas, L., Store |
| Haish Memorial Library |
| Halderman, Nathaniel, House |
| Hall, David, House |
| Halsted, Ann, House |
| Hamer, Edward, House |
| Hamer, Patterson, House |
| Hamilton, John M., 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 |
| Haskell Playhouse |
| Hatch, William H., House |
| Hauge Lutheran Church |
| Hauptgebaude |
| Havana Public Library |
| Hayward-Hill House |
| 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 |
| Herrick Cobblestone |
| Heurtley, Arthur, House |
| Hibbard, Charles H., House |
| Hibbard, Frank, Estate House-Deerpath Hill Estates |
| Hickox Apartments |
| Hickox, Virgil, House |
| Hickox, Warren, House |
| Hillcrest Apartment |
| Himmelfarb, Samuel and Eleanor House and Studio |
| 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 |
| Hoopeston Carnegie Public Library |
| Hoopes, William, House |
| Hopkinson, Ambrose, House |
| Hossack, John, House |
| Hotel Arthur |
| Hotel Aurora |
| Hotel Baker |
| Hotel Belleville |
| Hotel Del Prado |
Data from United States Park Service and Wikidata
