All - Constructed - 1850–1859
| Locke, Asa, House |
| """Lockkeeper's"" House" |
| Lockville Dam, Canal and Powerhouse |
| Lockwood Barn |
| Lockwood, Isaac, House |
| Loew-Define Grocery Store and Home |
| Logan City Hall |
| Lone Fir Cemetery |
| Long-A-Coming Depot |
| Longview |
| Louisville Male High School |
| Love, E. C., House |
| Lower Waterford Congregational Church |
| Lucerne |
| Luckert, David, House |
| Lucy Cobb Institute Campus |
| Lutze Housebarn |
| Lyon, T.U., House |
| Mabry, Joseph Alexander, Jr., House |
| Machpelah Cemetery |
| Magnolia |
| Mahaffie, J. B., House |
| Main Hall, Lawrence University |
| Manchester Methodist Episcopal Church |
| Manitou Island Light Station |
| Mannheim (082-0005) |
| Manning, Charles, House |
| Mann, John, House |
| Mann, R. N., House |
| Manship House |
| Maple Lawn |
| Marquette Harbor Light Station |
| Marshalldale |
| Mars Hill College Historic District |
| Marsh, John, House |
| Mary's River Covered Bridge |
| Masonic Hall, Old |
| Masters, Andrew Jackson and Sarah Jane, House |
| Matagorda Island Lighthouse |
| Matthews House |
| Matthews, Thomas and Margaret Spencer, Farm |
| Mayes-Hutton House |
| May-Stringer House |
| McAuley School District No. 27 |
| McBane, Camilus, House |
| McClurg Building |
| McCormick Distillery |
| McCoy Farmhouse |
| McDannald Homestead |
| McElhinny House |
| McFadden, O. B., House |
| McFarland House |
| McGehee Plantation |
| McSweeney, John, House |
| McVickar House |
| McWorter, Free Frank, Grave Site |
| Mebane-Nuckolls House |
| Meeks-Green Farmstead |
| Merestead |
| Merizo Conbento |
| Merrehope |
| Merrill, Harry, House |
| Merritt, Captain, House |
| Messenger, William C., House |
| Mill Agent's House |
| Mill Cove School |
| Miller House |
| Miller, Robert H., House |
| Minneapolis Pioneers and Soldiers Memorial Cemetery |
| Minor, Josias L. and Elizabeth A., Farmstead District |
| Minot's Ledge Light |
| Missouri Botanical Gardens |
| Moffat, John S., House |
| Monk House |
| Monteigne |
| Monte Vista Plantation House |
| Montgomery House |
| Montgomery Street School |
| Montpellier |
| Moore-Holt-White House |
| Moore, J. W., House |
| Morgan-Manning House |
| Mormon Flat Breastworks |
| Mormon Print Shop |
| Morrow, William P., House |
| Mount Adnah Cemetery |
| Mount de Sales Academy |
| Mount Feake Cemetery |
| Mount Holly |
| Mount Hope Cemetery |
| Mount Mora Cemetery |
| Mount Olivet Cemetery |
| Mount Pleasant |
| Mount Saint Bernard Seminary and Barn |
| Mt. Pleasant Winery Historic District |
| Mueller-Wright House |
| Mull Covered Bridge |
| Murch Family House |
| Murphys Hotel |
| Murray, Robert, House |
Data from United States Park Service and Wikidata
