Louisiana - Criteria: C (architecture/engineering)
| Long, Huey P., Mansion |
| Longue Vue House and Gardens |
| Longview |
| Longwood |
| Louisiana State Bank Building |
| Louisiana State Capitol Building and Gardens |
| Louisiana State Exhibit Building |
| Louisiana State University, Baton Rouge |
| Louisiana Superdome |
| Lowe-Forman House |
| Lower Pargoud |
| Loyd Hall Plantation |
| Lucky Plantation House |
| Lutcher United Methodist Church |
| Lyons, Benson H., House |
| Lyons House |
| Lyons House |
| Macedonia Baptist Church |
| Macheca Building |
| Madame John's Legacy |
| Madewood |
| Madison Parish Courthouse |
| Madisonville Bank |
| Magee, Nehemiah, House |
| Magee, Robert D., House |
| Magnolia |
| Magnolia Lane Plantation House |
| Magnolia Mound Plantation Dependency |
| Magnolia Mound Plantation House |
| Magnolia Plantation |
| Magnolias, The |
| Mahaffey, T. C., House |
| Main Street Historic District |
| Main Street Historic District |
| Maison De Marie Therese |
| Maison Olivier (Acadian House) |
| Major, Albin, House |
| Mansfield Historic District |
| Manship House |
| Marengo Plantation House |
| Marksville Commercial Historic District |
| Marston House |
| Martin House |
| Martin, Sidney, House |
| Mary Plantation House |
| Mason House |
| Masonic Building |
| Masonic Home for Children |
| Masonic Temple |
| Masur House |
| Mather House |
| McCaleb House |
| McClendon House |
| McCulla House |
| McDonald House |
| McDonogh School No. 6 |
| McGehee Hall, Southeastern Louisiana State University |
| McGehee House |
| McGill, Dr. Robert E. |
| McNeely Hotel |
| McNeely House |
| McNeese State University Auditorium |
| Meadows House |
| Melady House |
| Melrose Plantation |
| Merchants and Planters Bank |
| Merieult House |
| Metairie Cemetery |
| Meyer, Adolph, School |
| Mid-City Historic District |
| Miles-Hanna House |
| Miller House |
| Miller Memorial Library |
| Millet House |
| Mintmere |
| Monk House |
| Montegut Plantation House |
| Montet House |
| Monte Vista Plantation House |
| Montrose Plantation House |
| Moore House |
| Moore, R. T., House |
| Moreauville High School |
| Morehouse Parish Courthouse |
| Morel-Nott House |
| Morgan City City Hall and Courthouse |
| Moro Plantation House |
| Moss Grove Plantation House |
| Moundville Plantation House |
| Mount Hope Plantation House |
| Mount Lebanon Baptist Church |
| Mount's Villa |
| Mouton, Alexandre, House |
| Mouton, Charles H., House |
| Mt. Olivet Episcopal Church and Cemetery |
| Mulberry Grove |
| Mulberry Grove |
| Mundy-McFarland House |
| Myrtle Grove Plantation |
| Myrtle Hill Plantation House |
Data from United States Park Service and Wikidata
