Louisiana - Significance region: Local
| Kansas City Southern Railway Depot |
| Karnofsky Tailor Shop-House |
| Kateland |
| Katie Plantation House |
| Keegan House |
| Keegan House |
| Keeny Hall-Louisiana Tech University |
| Kell House |
| Kenilworth Plantation House |
| Kenner Town Hall |
| Kent, Charles Adolph, Sr., House |
| Kerner House |
| Key-Mize House |
| Kidd-Davis House |
| Killarney |
| Killgore House |
| Kings Highway Christian Church |
| Kirby-Adam House |
| Kirby House |
| Kisatchie School |
| Kleinert Terrace Historic District |
| Kleinpeter House |
| Kleinpeter, John and Amelia Sharp, House |
| Knight Cabin |
| Knox Building |
| Kraemer House |
| Kurth, Joseph H., Jr. House |
| LaBarre House |
| Lacombe School |
| Lafayette Central Business District |
| Lafayette Coca-Cola Bottling Plant |
| Lafayette Elementary School |
| Lafayette Hardware Store |
| LaFleur House |
| Lafourche Parish Courthouse |
| Lake Charles City Hall, Old |
| Lake Charles Historic District |
| Lake Providence Historic District |
| Lakeside Municipal Golf Course |
| Lakewood |
| LaLanne, Dominique, House and Store |
| Lamartina Building |
| Lambert House |
| Lamourie Lock |
| Lancon, Hilaire, House |
| Landry, Kenneth C. and Carolyn B., House |
| Landry Plantation House |
| Lapeyrouse Grocery |
| Laran, Jean Marie, House |
| LaTour, Alexis, House |
| Laurel Hill |
| Laurel Street Fire Station |
| LeBeau House and Kitchen |
| LeBeuf Plantation House |
| Lecompte High School |
| Ledet House |
| Leeds Iron Foundry |
| Lefort House |
| LeJeune House |
| LeJeune's Bakery |
| Lemann Store |
| Lemoine, Thomas A., House |
| Lemoine, Thomas A., House |
| Lewis House |
| Lewis House |
| Lewis, John, House |
| Liberty Lodge No. 123, F & A M |
| Liberty Theatre |
| Lincoln Beach |
| Lincoln, George, House |
| Lincoln Theater |
| Lindsey Bonded Warehouses |
| Line Avenue School |
| Linwood Plantation Manager's House |
| Little Texas |
| Live Oak |
| Livingston Parish Courthouse, Old |
| Lobell, Adam, House |
| Lone Pine |
| Longbranch Annex |
| Long, George Parker, House |
| Long, Huey P., Mansion |
| Long, Huey P., Memorial Hospital |
| Longstreet Rosenwald School |
| Longview |
| Longwood |
| Louisiana Coca-Cola Bottling Company Plant |
| Louisiana Railway and Navigation Company Depot |
| Louisiana State Exhibit Building |
| Lowe-Forman House |
| Lower Pargoud |
| Loyd Hall Plantation |
| Lozano, Louis S., House |
| Lucky Plantation House |
| Lutcher United Methodist Church |
| Lykes Brothers Steamship Company Historic District |
| Lyons, Benson H., House |
| Lyons House |
| Lyons House |
| Macedonia Baptist Church |
Data from United States Park Service and Wikidata
