All - Constructed - 1910–1919
| Manti Motor Company Building |
| Maple Court Apartments |
| Marble Bridge |
| Marble High School |
| Marconi-RCA Bolinas Transmitting Station |
| Marconi Wireless Telegraphy Station |
| Marcus Hook Range Rear Light |
| Margaret Block |
| Marian Apartments |
| Marine Corps Recruit Depot Historic District |
| Mariposa County High School Auditorium |
| Marks, M. J., House |
| Marland-Paris House |
| Marquette County Courthouse and Marquette County Sheriff's Office and Jail |
| Marshall Bridge |
| Marsh Rainbow Arch Bridge |
| Martin Building |
| Martin Cemetery |
| Martin Hotel |
| Martin, Manfred and Ethel, House |
| Mary E. Wells School |
| Marysville Opera House |
| Mason, A. J., Building |
| Masonic Temple |
| Masonic Temple |
| Mason, Walt, House |
| Massachusetts State Armory |
| Massad, Anthony, Three-Decker |
| Master Mechanic's House |
| Maverick Concert Hall |
| Maxwell, Art and Frieda, Barn |
| May Company |
| May, Robert, House |
| McAllister Bridge |
| McArthur-Council House |
| McCarron, Andrew, Three-Decker |
| McCauley Bridge |
| McClure, Alexander K., School |
| McCormick Apartments |
| McCray School |
| McDonald, Malcolm, House |
| McGee House |
| McGraw, James J., House |
| McMaster School |
| McMonies Barn |
| Meacham Building |
| Mechanicsville School |
| Mederville Bridge |
| Medford Carnegie Library |
| Medford Free Public Library |
| Meekins, Thedore S., House |
| Memorial Building |
| Memorial Park |
| Memphis Merchants Exchange |
| Merchants and Planters Bank |
| Merchants National Bank and Annex |
| Mercy Hospital |
| Meridian Mansions |
| Meridian Museum of Art |
| Mesa Schoolhouse |
| Miah Maull Shoal Lighthouse |
| Miami Beach Architectural District |
| Michelsen, George J. Furniture Factory |
| Michigan City Breakwater Light |
| Midland Depot |
| Miller, Allan, House |
| Miller, Frederick A., House-Broad Gables |
| Miller, Joseph M., Mausoleum |
| Mills Building |
| Milltown Hutterite Colony |
| Milwaukee Hospital |
| Minburn Railroad Depot |
| Miner, Alice T., Colonial Collection |
| Mishawaka Carnegie Library |
| Missouri Heights School |
| Missouri Pacific Depot |
| Missouri-Pacific Railroad Depot-Arkadelphia |
| Missouri-Pacific Railroad Depot-Malvern |
| Missouri State Capitol Building and Grounds |
| Mitchell House |
| Mitchell Lewis Building |
| M.K. and T. Depot in Laverne |
| Model School Building and College Hall of the Winona Normal School |
| Mohnike Adobe |
| Mohr and Yoerk Market |
| Monroe Avenue Water Filtration Plant |
| Monroe Street Bridge |
| Montclair Art Museum |
| Montgomery, I. T., House |
| Montlake Bridge |
| Montrose Park |
| Moody Barn |
| Moody County Courthouse |
| Moore Fabric Company Plant |
| Morgan, John Hunt, Memorial |
| Morris, Lewis G., House |
| Morrison Lodge |
| Morton Building |
| Moscow High School |
| Mount Adams Fire Observation Station |
Data from United States Park Service and Wikidata
