All - Constructed - 1920–1929
| Loomis Vistor Center, Bldg. 43 |
| Los Tomases Chapel |
| Louden, R.R., and Antoinette, House |
| Louise Home Hospital and Residence Hall |
| Louisville Municipal Bridge, Pylons and Administration Building |
| Lou Mitchell's Restaurant |
| Lovell Beach House |
| Lower Nyack Snowshoe Cabin |
| Lower Park Creek Patrol Cabin |
| Lowville Masonic Temple |
| Luling's City Laundry |
| Lundring Service Station |
| L'Union Saint Jean-Baptist d' Amerique |
| Lynch, Timothy J., House |
| M-50-Sandstone Creek Bridge |
| M-86-Prarie River Bridge |
| Maccabees Building |
| Mack-International Motor Truck Corporation Building |
| MacLean Hall |
| Macmillan Building |
| Madison Hotel |
| Madison Masonic Temple |
| Madison Museum |
| Madison Vocational School |
| Magen David Synagogue |
| Maher Building |
| Mahoney House and Garage |
| Main Street Subway Station (Dual System IRT) |
| Mainstreet Theatre |
| Majestic Theatre |
| Majestic Theatre |
| Malden Towers |
| Mallard Peak Lookout |
| Mallory Avenue Christian Church |
| Malvern Hall |
| Mammoth Cave Baptist Church and Cemetery |
| Manchester Terrace |
| Manning-Rye Covered Bridge |
| Mann Manor |
| Manor House |
| Mansfield Battle Park |
| Maquoketa Caves State Park Historic District |
| Marcus, Samuel and Nina, House |
| Market Street Bridge |
| Marland, E. W., Mansion |
| Marlborough, The |
| Marquette Hotel |
| Marshall Hotel |
| Marshall Memorial Hall |
| Mars Hill School |
| Martinez, Jacinto Lopez, Grammar School |
| Martin Luther King, Jr. Historic District (Boundary Increase) |
| Marwood Apartments |
| Mary Elizabeth Day Nursery |
| Marysville Union Pacific Depot |
| Masonic Hall |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple and Scottish Rite Cathedral |
| Masonic Temple-Auburn |
| Masonic Temple Building |
| Masonic Temple Building |
| Massey Hill High School |
| Maumelle River Bridge |
| Mauney, Jacob S., Memorial Library and Teacher's Home |
| Maverick Lloyd, Lola, House |
| Maxbilt Theatre |
| Mayer, George P., Boathouse |
| Mayfair Apartments |
| Mays, James Henry and Ida Owen, House |
| McCanless, Walter, House |
| McClain County Courthouse |
| McCleery Calendar Factory |
| McClintock Storage Warehouse |
| McCollum, Elmer V., House |
| McCook YMCA |
| McCormick Cabin Site |
| McCurry-Kidd House |
| McDonald Theater Building |
| McDowell County Courthouse |
| McFerrin, John B., House |
| McGraw, Grace Ingersoll, House |
| McGregor Apartments |
| McKay |
| McPherson County Courthouse |
| Meacham Elementary School |
| Meaders, F.W., House |
| Meadow Brook Farms |
| Mecca Temple |
| Mecklenburg County Courthouse |
| Medical Arts Building |
| Medina Masonic Temple and Medina Theater |
| Mee, Joe, House |
| Megginson, Ernest, House |
| Melvin School |
| Memorial Building |
| Memorial Gymnasium |
| Memorial Gymnasium |
| Memorial Hall |
| Mensch, William Alfred, Building |
Data from United States Park Service and Wikidata
