Illinois - Role: Building
| Mattfeldt, Theodore H. O., House |
| Mattis, George and Elsie, House |
| Maverick Lloyd, Lola, House |
| Maxwell-Briscoe Automobile Company Showroom |
| Mayfair Apartments |
| Maynard, Isaac N., Rowhouses |
| Maywood Fire Department Building |
| McAuley School District No. 27 |
| McClintock, John and Amelia, House |
| McClure, Thomas J. and Caroline, House |
| McClurg Building |
| McCormick, Charles Emmor, House |
| McDonough County Courthouse |
| McFarland House |
| McGrath, John, House |
| McJunkin, William, House |
| McLean County Courthouse and Square |
| Meetinghouse of the Central Congregational Church |
| Melwood Apartments |
| Memorial Hall |
| Memorial Washington Reformed Presbyterian Church |
| Menard, Pierre, House |
| Mercer County Courthouse |
| Mercer County Jail |
| Mermaid House Hotel |
| Mershon, Joab, House |
| Metal Shop |
| Metamora Courthouse |
| Methodist Episcopal Church |
| Meyer, Pearl and Bess, House |
| Michigan-Lee Apartments |
| Mid-City Trust and Savings Bank |
| Midwest Athletic Club |
| Military Drill Hall and Men's Gymnasium |
| Milk, Lemuel, Carriage House |
| Millard, George Madison, House |
| Millard, Sylvester, House |
| Miller, Allan, House |
| Miller, Bell, Apartments |
| Miller-Davis Law Buildings |
| Miller, George H., House |
| Miller, Henry W., House |
| Miller, Joseph, House |
| Millikan, Robert A., House |
| Millikin, James, House |
| Millward, Caroline, House |
| Milne, Robert, House |
| Mineola Hotel |
| Miners Institute Building |
| Moats, William, Farm |
| Mobile and Ohio Railroad Depot |
| Monadnock Block |
| Montgomery County Courthouse |
| Montgomery, John Rogerson, House |
| Montgomery Ward Company Complex |
| Moore, C. H., House |
| Morgan County Courthouse |
| Morgan-Wells House |
| Morse, Robert Hosmer, House |
| Morton, Asher, Farmstead |
| Morton, J. Sterling, High School East Auditorium |
| Moss, Henry Clay, House |
| Motley, John Lothrop, School |
| Moultrie County Courthouse |
| Mount Lookout |
| Mount Pulaski Courthouse |
| Muddy Waters House |
| Muhammad, The Honorable Elijah, House |
| Muirhead, Robert and Elizabeth, House |
| Muller House |
| Mundelein College Skyscraper Building |
| Municipal Courts Building |
| Murphysboro Elks Lodge |
| Murphysboro Masonic Lodge No. 498 A.F & A.M |
| Nachusa House |
| Narodni Sin |
| Narragansett, The |
| Natural History Building |
| Neuville, The |
| Newcomb, Richard F., House |
| New Masonic Building and Oriental Theater |
| New Orpheum Theatre |
| Nichols, Harry H., House |
| Nickerson, Samuel, House |
| Nisbet Homestead Farm |
| Noble-Seymour-Crippen House |
| Normal Theater |
| North Eighth Street Plaza |
| North Grove School |
| North Sangamon United Presbyterian Church |
| Northwestern Terra Cotta Company Building |
| Notre Dame de Chicago |
| Oak Park Conservatory |
| Oak Park Village Hall |
| Oak Ridge Apartments |
| Oakton Gables |
| O'Connell, Daniel, House |
| O'Conor, Andrew J., III, House |
| Octagon House |
| Odd Fellows Opera Block |
Data from United States Park Service and Wikidata
