Massachusetts - Criteria: A (event)
| Massachusetts General Hospital |
| Massachusetts Hall, Harvard University |
| Massachusetts Historical Society Building |
| Massachusetts Mental Health Center |
| Massachusetts School of Art |
| Massad, Anthony, Three-Decker |
| Matthews Fulling Mill Site |
| Maynard, Charles, House |
| McCafferty, Elizabeth, Three-Decker |
| McCarron, Andrew, Three-Decker |
| McDermott, John B., Three-Decker |
| McElwain, William H., School |
| McGill, John H., House |
| McGrath, Patrick, Three-Decker |
| McGuinness, Patrick, Three-Decker |
| McIntire, Herman, House |
| McIntosh Corner Historic District |
| McKinney Building |
| McKinstry, William, Farmhouse |
| McKinstry, William, Jr., House |
| McKnight District |
| McLean Hospital National Register District |
| McPartland, Frank, Three-Decker |
| McPartland, James, Three-Decker |
| Mechanics Block Historic District |
| Mechanics Hall |
| Mechanics' Hall District |
| Mechanics Mill |
| Mechanic Street Cemetery |
| Medfield State Hospital |
| Medway Village Historic District |
| Meetinghouse Common District |
| Meetinghouse Green Historic District |
| Melrose Public Library |
| Melrose Town Center Historic District |
| Memorial Hall Library |
| Memorial Town Hall |
| Mendon Center Historic District |
| Men of Kent Cemetery |
| Merrell Tavern |
| Merriam, M.H. and Company |
| Merrill's Wharf Historic District |
| Merrimack Associates Building |
| Methodist Church |
| Methodist Episcopal Society of Tyringham |
| Metropolitan District Commission Pumping House |
| Metropolitan District Commission Stable |
| Metropolitan State Hospital |
| Metropolitan Theatre |
| Middleborough Center Historic District |
| Middleborough Waterworks |
| Middlefield-Becket Stone Arch Railroad Bridge District |
| Middlefield Center Historic District |
| Middlesex Canal |
| Middlesex Canal Historic and Archeological District |
| Middlesex Fells Reservation Parkways |
| Middlesex Fells Reservoirs Historic District |
| Milestone |
| Millicent Library |
| Millis Center Historic District |
| Mill-Prospect Street Historic District |
| Mill River Historic District |
| Mills-Hale-Owen Blocks |
| Mill Village Historic District |
| Mill Way Historic District |
| Milton-Bradley Company |
| Milton Cemetery |
| Milton Centre Historic District |
| Milton Hill Historic District |
| Minot's Ledge Light |
| Minute Man National Historical Park |
| Miss Florence Diner |
| Mission Chapel |
| Mission Hill Triangle Historic District |
| Miss Toy Town Diner |
| Miss Worcester Diner |
| Mohawk Trail |
| Monadnock Road Historic District |
| Monarch Diner |
| Monomoy Point Lighthouse |
| Monson Center Historic District |
| Monson Developmental Center |
| Montague Center Historic District |
| Montrose, The |
| Montville Baptist Church |
| Monument Mills |
| Monument Park Historic District |
| Monument Square-Eagle Street Historic District |
| Monument Square Historic District |
| Monument Square Historic District |
| Monument Square Historic District |
| Moody Street Fire Station |
| Moody Street Historic District |
| Moore-Hill House |
| Moore House |
| Moore's Corner Historic District |
| Moore State Park Historic District |
| Moran Square Historic District |
| Moreland Street Historic District |
| Moreland Terrace Historic District |
Data from United States Park Service and Wikidata
