All - Architectural style - Neoclassical architecture
| Meredith Public Library |
| Merrehope |
| Merridun |
| Merrill, Levi, House |
| Merrill-Maley House |
| Merrimack Associates Building |
| Mershon Building |
| Mertz, John, House |
| Messenger, William C., House |
| Metcalf, James and Caroline M., House |
| Methodist Episcopal Church |
| Methodist Episcopal Church, South |
| Methodist Tabernacle |
| Metropolitan Life Insurance Company Hall of Records |
| Metropolitan Museum of Art |
| Metropolitan Opera House |
| Metropolitan Theatre |
| Metter High School |
| Meyer-Kiser Building |
| Miami County Courthouse |
| Miami Marathon Oil Company Service Station |
| Middlebourne Historic District |
| Middleton, Dr. George McLelland, House and Garage |
| Millen High School |
| Miller, Fred O., House |
| Miller, Issac, House |
| Mills County Courthouse |
| Mills House |
| Milpitas Grammar School |
| Milwaukee County Courthouse |
| Milwaukee County Dispensary and Emergency Hospital |
| Minden Inn |
| Minot Carnegie Library |
| Mississippi County Courthouse |
| Missoula County Courthouse |
| Missouri State Capitol Building and Grounds |
| Mitchell County Courthouse |
| Mitchell House |
| Mitchell, James, School |
| Mitchell, McKendree, House |
| Moffat Station |
| Mohave County Courthouse and Jail |
| Mohrbacher, Paul, House |
| Monarch Milling Company |
| Money Farm |
| Monogram Square |
| Monroe County Courthouse |
| Monroe County Courthouse |
| Monroe School |
| Monroe Street School |
| Montana State Capitol Building |
| Montclair Art Museum |
| Monteith Hall |
| Monterey High School |
| Montevideo Carnegie Library |
| Montezuma Valley National Bank and Store Building |
| Montgomery County Courthouse |
| Montgomery County Courthouse |
| Montgomery Ward and Company General Merchandise Warehouse |
| Monticello |
| Monticello Carnegie Library |
| Monticello Hotel |
| Montour Falls Union Grammar School |
| Montrose County Courthouse |
| Montrose Masonic Temple, Lodge No. 63 |
| Moody County Courthouse |
| Moon, D. R., Memorial Library |
| Moore-Dalton House |
| Moore, Edward W. and Louise C., Estate |
| Moore House |
| Moore, John M. and Lottie D., House |
| Moore, Leonard M., House |
| Mooresville Gymnasium |
| More Automobile Company Building |
| Morgan-Bedinger-Dandridge House |
| Morgan Block |
| Morgan County Courthouse |
| Morningside |
| Morrill County Courthouse |
| Morris, Joseph Henry, House |
| Morris Memorial Building |
| Morrison-Mott House |
| Morrison, William J., Jr., House |
| Morrow House |
| Moscow High School |
| Moton, Robert Russa, High School |
| Motor Coach Division Building-Denver Tramway Company |
| Moultrie County Courthouse |
| Mountaineer Hotel |
| Mountain Hall |
| Mountain Home |
| Mount Bernard Complex |
| Mount de Sales Academy |
| Mount Olive High School (Former) |
| Mount Pleasant School |
| Mount St. Mary's Hospital |
| Mount Zion Lodge Masonic Temple |
| Mt. Moriah Masonic Lodge #155 |
| Mt. Zion AME Zion Church |
| Mt. Zion Baptist Church |
Data from United States Park Service and Wikidata
