All - Constructed - 1900–1909
| Masonic Temple Building |
| Masonic Temple-Newport Lodge No. 445 F. & A.M. |
| Massie Wireless Station |
| Matson, Mike and Mary, Historic Farmstead |
| Matthews, Dr. James O., Office |
| Maxwell-Briscoe Automobile Company Showroom |
| Maxwell Creek Bridge on Hardin Road |
| Mays Lick Consolidated School |
| Maywood Fire Department Building |
| McCarthy Homestead Cabin |
| McCauley Cabin |
| McChord, William C., House |
| McCleary Elementary School |
| McClung, J. J., House |
| McCone Residence |
| McCristy-Knox Mansion |
| McCulla House |
| McCurdy Smokehouse |
| McDonell High School |
| McEachron, C. E., General Merchandise |
| McElroy, H. E., House |
| McFadden Barn |
| McGill, John H., House |
| McIntosh-Goodrich Mansion |
| McKay, John A., House and Manufacturing Company |
| McKinley, William, Tomb |
| McMicken, Alexander Herschel and Pauline G., House |
| McNutt-Howard House |
| McWhorter, Port and Helen, House |
| Meese, Gustav, Building |
| Meigs County Courthouse |
| Meloy House |
| Melrose Public Library |
| Melvin, Dr. Wayman C. House |
| Melwood Apartments |
| Memorial Hall |
| Mendelson, A., and Son Company Building |
| Menefee, L. B., House |
| Mequnticook Golf Club |
| Mercer Museum |
| Mercer Street Historic District |
| Merchants and Farmers Bank Building |
| Merrill-Maley House |
| Mesa Verde National Park |
| Metal Office Furniture Company (Steelcase) Plants No. 2 and 3 |
| Metropolitan Life Insurance Company |
| Metropolitan Life Insurance Company Hall of Records |
| Meyers House |
| Miami Senior High School |
| Mianus River Railroad Bridge |
| Michigan City East Pierhead Light Tower and Elevated Walk |
| Michigan City Post Office |
| Middle Island Light |
| Middletown Bridge |
| Mielke, Joseph, House |
| Mill Creek Bridge |
| Miller, David H., Tobacco Warehouse |
| Millikan, Robert A., House |
| Millpond Plantation |
| Milwaukee Road Depot |
| Mindoro Cut |
| Minneola Manufacturing Company Cloth Warehouse |
| Minnesota State Capitol |
| Minor Sod House |
| Mishler Theatre |
| Missionary Society of the Methodist Episcopal Church |
| Mitchell, Amy B., House |
| Mitchell County Courthouse |
| Mizpah Hotel |
| Moana Hotel |
| Moise, Julius J., House |
| Monaghan Mill |
| Montana State Capitol Building |
| Montezuma Castle National Monument |
| Montgomery Court |
| Montrose Presbyterian Church |
| Montrose Schoolhouse |
| Moon, D. R., Memorial Library |
| Moore Theatre and Hotel |
| Moore-Ward Cobblestone House |
| Moore, William H., House |
| Morschauser, Charles, House |
| Morse, Burton, House |
| Morton Memorial Laboratory of Chemistry |
| Morton Memorial Library |
| Moss Hill |
| Most Precious Blood Roman Catholic Church, Rectory and Parochial School |
| Mothers' and Daughters' Club House |
| Mound Bayou Bank |
| Mountain Home Carnegie Library |
| Mountain School |
| Mount Salem Church and School |
| Mount Zion Baptist Church |
| Mount Zion Baptist Church |
| Moyer Row Houses |
| Moyes, William, Jr., House |
| Mt. Olive Cemetery |
| Mueller Homestead |
| Mukilteo Light Station |
| Mulvey Mercantile |
Data from United States Park Service and Wikidata
