Illinois - Role: Building
| La Grange Village Historic District |
| LaHarpe City Hall |
| Lake-Peterson House |
| Lake Shore Apartments |
| Lakeside Press Building |
| Lake-Side Terrace Apartments |
| Lamoine Hotel |
| Lamont, Robert P., House |
| Lampert-Wildflower House |
| Lanzl, Haerman, House |
| Laramie State Bank Building |
| Larchmound |
| Larkin Home for Children |
| Larson, Mads C., House |
| LaSalle City Building |
| Lathrop, Bryan, House |
| Laurent, Kenneth and Phyllis, House |
| Lawrence County Courthouse |
| Lawson, Victor F., House YMCA |
| Lazy A Motel |
| LeClaire Hotel |
| Legler, Henry E., Regional Branch of the Chicago Public Library |
| Leiter II Building |
| Lemont Central Grade School |
| Lemont Methodist Episcopal Church |
| Leonard, Clifford Milton, Farm |
| Lesem, S.J., Building |
| Lewis, John L., House |
| Lewis, John W., House |
| Lewis, Lloyd, House |
| Lewis Round Barn |
| Liberty Theater |
| Libertyville High School Brainerd Building |
| Libertyville Town Hall |
| Library Hall |
| Library-University of Illinois at Urbana-Champaign |
| Lichtstern House |
| Lillie, Frank R., House |
| Lincoln Branch Peoria Public Library |
| Lincoln Building |
| Lincoln Colored Home |
| Lincoln Park, South Pond Refectory |
| Lincoln Public Library |
| Lindemann and Hoverson Company Showroom and Warehouse |
| Linden Avenue Terminal |
| Lind, Jenny, Chapel |
| Lindsay, Vachel, House |
| Linn, Howard and Lucy, House |
| Litchfield Elks Lodge No. 654 |
| Litchfield Public Library |
| Little Brick House |
| Livingston County Courthouse |
| Lloyd, Henry Demarest, House |
| Loeb, Ernest, House |
| Lone Tree School |
| Loucks, Charles N., House |
| Louisville and Nashville Depot |
| Lou Mitchell's Restaurant |
| Lovejoy, Owen, Homestead |
| Ludington Building |
| Lumber Exchange Building and Tower Addition |
| Lundberg, Charles, House |
| Lynch, Timothy J., House |
| Lyons Township Hall |
| Madison Theatre |
| Madlener, Albert F., House |
| Magill House |
| Magnolia Manor |
| Maher, George W., House |
| Maid-Rite Sandwich Shop |
| Majestic Theatre |
| Malden Towers |
| Malvern Roller Mill |
| Mandel Brothers Warehouse Building |
| Mandel, Mr. Fred L., Jr., House |
| Manhattan Building |
| Manly-McCann House |
| Manor House |
| Maple Avenue Maple Lane Historic District |
| Maple Court Apartments |
| Marine Chapter House |
| Marissa Academy |
| Mark, Caroline, House |
| Mark Twain Hotel |
| Marquette Apartments |
| Marquette Building |
| Marshall Field and Company Store |
| Marshall Field Company Store |
| Marshall Hotel |
| Marsh, William W., House |
| Martin House |
| Martin, Pierre, House |
| Martin, Sarah, House |
| Mary A. Todd School |
| Marywood Academy |
| Masonic Temple |
| Masonic Temple Building |
| Masonic Temple Building |
| Mason, Paris, Building |
| Massie Variety Store |
Data from United States Park Service and Wikidata
