Louisiana - Criteria: A (event)
| Kansas City Southern Depot, Zwolle |
| Kansas City Southern Railway Depot |
| Karnofsky Tailor Shop-House |
| Keegan House |
| Keeny Hall-Louisiana Tech University |
| Kenner Town Hall |
| Knight Cabin |
| Kress Building |
| Kurth, Joseph H., Jr. House |
| Lacombe School |
| Lafayette Coca-Cola Bottling Plant |
| Lafayette Elementary School |
| Lafitte Avenue Project Buildings C-47, E-45 and No. 46 |
| Lafourche Parish Courthouse |
| Lake Charles City Hall, Old |
| Lake Charles Historic District |
| Lake Providence Historic District |
| Lamourie Lock |
| Laura Plantation |
| Laurel Valley Sugar Plantation |
| LeCarpentier-Beauregard-Keyes House |
| Leeds Iron Foundry |
| LeJeune's Bakery |
| Levert-St. John Bridge |
| Lewis House |
| Liberty Theatre |
| Lincoln Theater |
| Lindsay, Col. Robert H., House |
| Livingston Parish Courthouse, Old |
| Long, Huey P., Mansion |
| Longstreet Rosenwald School |
| Los Adaes |
| Louisiana Railway and Navigation Company Depot |
| Louisiana State Capitol Building and Gardens |
| Louisiana Superdome |
| Lutcher & Moore Cypress Lumber Co., Ltd., Headquarters Building |
| Lutzenberger Foundry and Pattern Shop Building |
| Madisonville Boarding House |
| Madisonville Town Hall |
| Magee, Nehemiah, House |
| Magnolia Cemetery |
| Magnolia Plantation |
| Magnolias, The |
| Magnolia Street Housing Project |
| Maison De Marie Therese |
| Mansfield Battle Park |
| Marksville Commercial Historic District |
| Martin, Ed, Seafood Company Factory and House |
| Maylie's Restaurant |
| McDonogh 19 Elementary School |
| McKinley High School |
| McNeely House |
| McNutt Rural Historic District |
| McNutt School |
| Meeker Sugar Refinery |
| Melrose Plantation |
| Merieult House |
| Mer Rouge High School |
| Methodist Home Hospital |
| Meyer, Adolph, School |
| Midland Branch Railroad Depot |
| Miller, J. M., and Brother Store |
| Miller-Roy Building |
| Milner Motors |
| Mix Store and Post Office |
| Moreauville High School |
| More Mileage Gas Station |
| Morgan City City Hall and Courthouse |
| Moundville Plantation House |
| Mount Lebanon Baptist Church |
| Mouton, Alexandre, House |
| Muller's Department Store |
| Myrtles Plantation |
| Napoleon Street Branch Library |
| New Orleans and Northeastern-New Orleans and Great Northern Railroad Depot |
| New Orleans City Park Carousel and Pavilion |
| New Orleans Cotton Exchange Building |
| Nicholls, Francis T., Junior College Main Building |
| Normal Hill Historic District |
| Nottoway Plantation House |
| Oak Alley Plantation |
| Oak Grove Community House |
| Oakland Cemetery |
| Oaklawn Manor |
| Oakley Plantation House |
| Oaks Hotel |
| Oasis, The |
| Odd Fellows Rest Cemetery |
| Ogilvie Hardware Company Building |
| Old Castillo Hotel |
| Old Commercial National Bank Building |
| Old Courthouse Square |
| Old Lafayette City Hall |
| Old Louisiana State Capitol |
| Old LSU Site |
| Old Meat Market-Old Meat Market |
| Old Post Office |
| Old Ursuline Convent |
| OLIVE JEANETTE |
| Orpheum Theatre |
Data from United States Park Service and Wikidata
