All - Architectural style - Federal architecture
| Mappa Hall |
| Marble Head |
| Marietta |
| Market House |
| Market Street Row |
| Marl Hill |
| Marquart-Mercer Farm |
| Marshall, Gen. George C., House |
| Marshall, John, House |
| Marshall, Paul, House |
| Marshall's Grove |
| Marshallton Inn |
| Marsh, Joseph, House |
| Marshlands |
| Marsh Stream Farm |
| Martin, Benjamin, House |
| Martin House |
| Martin House |
| Martin House |
| Martin, James G., House |
| Maslin, Thomas, House |
| Mason, Dr. Moses, House |
| Masonic Temple and Theater |
| Mason, John, House |
| Mason, Josiah, Jr., House |
| Mason-Tillett House |
| Mason-Watkins House |
| Massachusetts Hall, Bowdoin College |
| Massachusetts Statehouse |
| Massanutton Heights |
| Massie House |
| Matheny-Taylor House |
| Mattoon-Woodrow House |
| Maxcy, Joseph and Hannah, Homestead |
| May, Asa, House |
| Mayfield, John, House |
| May-Lewis, Benjamin, House |
| May, Samuel, House |
| McBean, Daniel, Farmstead |
| McCammon, Samuel, House |
| McCartney-Bone House |
| McClain-Ellison House |
| McCleary Farm |
| McClelland-Davis House |
| McClelland Homestead |
| McClenahan House |
| McClure-Shelby House |
| McConnell House, Law Office, and Slave Quarters |
| McConnell, James, House |
| McConnell, William, House |
| McCormack Church |
| McCoy House |
| McGee, John, House |
| McGuire-Setzer House |
| McIlwaine House |
| McKibben, S. M., House |
| McKinney-Helm House |
| McKinstry, William, Jr., House |
| McLellan-Sweat Mansion |
| M'Clintock House |
| McLure, John, House |
| McMahan Homestead |
| McMahon, John, House |
| McNeely-Strachan House |
| McNeil Homestead |
| McRae-McQueen House |
| McVean, David, House |
| McWain-Hall House |
| Mead House |
| Meadows, The |
| Meadows, The |
| Meadvilla |
| Meeker, Forrest, House and Farm |
| Meeteer House |
| Meeting-of-the-Waters |
| Melius-Bentley House |
| Melrose |
| Melrose |
| Melton-Fortune Farmstead |
| Mendon Cobblestone Academy |
| Mercer House |
| Meredith, Simon, House |
| Merrifield-Cass House |
| Merrifield House |
| Merry, Prettyman, House |
| Methodist Episcopal Church of East DeKalb |
| Methodist Manse |
| Middle Island Presbyterian Church |
| Middlekauff, Jacob and Juliana, House |
| Middleton, Jesse, House |
| Midway |
| Midway Plantation |
| Milldean and Alexander-Davis House |
| Miller-Cansler House |
| Miller, Daniel, House |
| Miller, Edward, House |
| Miller House |
| Miller, John, House |
| Miller, Joseph, House |
| Miller-Pence Farm |
Data from United States Park Service and Wikidata
