Illinois - Significance region: National
| French Colonial Historic District |
| Fuller Park |
| Fuller, R. Buckminster, and Anne Hewlett Dome Home |
| Gale, Mrs. Thomas H., House |
| Gale, Walter, House |
| Garfield Park |
| Gauler, John, Houses |
| General Dean Suspension Bridge |
| Getty Tomb |
| Glessner, John J., House |
| Glidden, Joseph F., House |
| Gold Coast Historic District |
| Graceland Cemetery |
| Grant Park |
| Grant, Ulysses S., House |
| Great Lakes Naval Training Station |
| Grierson, Gen. Benjamin Henry, House |
| Grosse Point Light Station |
| Halsted, Ann, House |
| Hamilton Park |
| Hauge Lutheran Church |
| Haymarket Martyrs' Monument |
| Hegeler-Carus Mansion |
| Heller, Isadore H., House |
| Hennepin Canal Historic District |
| Heurtley, Arthur, House |
| Hickox, Warren, House |
| Holy Trinity Russian Orthodox Cathedral and Rectory |
| Hossack, John, House |
| Hubbard House |
| Hubele Mounds and Village Site |
| Hull House |
| Hyde Park-Kenwood Historic District |
| Illinois and Michigan Canal |
| Illinois Institute of Technology Academic Campus |
| Illinois Waterway Project Office |
| Indian Statue |
| Jackson Park Historic Landscape District and Midway Plaisance |
| Jarrot, Nicholas, Mansion |
| Jensen, Jens, Summer House and Studio |
| Jewelers' Building |
| Joliet Township High School |
| Jubilee College |
| Kamp Mound Site |
| Kehilath Anshe Ma'ariv Synagogue |
| Kennicott's Grove |
| Kent, Sydney, House |
| Keystone Building |
| Kimball, William W., House |
| Kincaid Site |
| Koerner, Gustave, House |
| Kolmer Site |
| Koster Site |
| La Grange Lock and Dam Historic District |
| Larchmound |
| Larson Site |
| Leiter II Building |
| Lewis, John L., House |
| Lillie, Frank R., House |
| Lincoln, Abraham, Memorial Garden |
| Lincoln Home National Historic Site |
| Lincoln Park |
| Lincoln Park Lily Pool |
| Lincoln's New Salem Village |
| Lincoln Tomb |
| Lind, Jenny, Chapel |
| Lindsay, Vachel, House |
| Lloyd, Henry Demarest, House |
| Lock and Dam No. 13 Historic District |
| Lock and Dam No. 15 Historic District |
| Lock and Dam No. 17 Historic District |
| Lock and Dam No. 18 Historic District |
| Lock and Dam No. 21 Historic District |
| Lockport Lock, Dam and Power House Historic District |
| Lovejoy, Owen, Homestead |
| Ludington Building |
| Lunsford-Pulcher Archeological Site |
| Madlener, Albert F., House |
| Main Street Historic District |
| Manhattan Building |
| Marquette Building |
| Marseilles Lock and Dam Historic District |
| Marshall Field Company Store |
| Mazon Creek Fossil Beds |
| McClurg Building |
| Menard, Pierre, House |
| Michigan-Wacker Historic District |
| Millikan, Robert A., House |
| Millikin, James, House |
| Millstone Bluff |
| Mitchell Archeological Site |
| Modoc Rock Shelter |
| Monadnock Block |
| Montgomery Ward Company Complex |
| Morrow Plots, University of Illinois |
| Mound City National Cemetery |
| Mound House Site |
| Muddy Waters House |
| Muhammad, The Honorable Elijah, House |
| Naples Mound 8 |
Data from United States Park Service and Wikidata
