| Nom du Parc | Etat/Ville | Type du Parc |
| Lake Chelan National Recreation Area | Washington (Stehekin) | National Recreation Area |
| Lake Clark National Park & Preserve | Alaska (Port Alsworth) | National Park & Preserve |
| Lake Mead National Recreation Area | Nevada (Le désert de Mojave (Arizona et Nevada)) | National Recreation Area |
| Lake Meredith National Recreation Area | Texas (Fritch) | National Recreation Area |
| Lake Roosevelt National Recreation Area | Washington (Coulee Dam le long de la rivière Columbia) | National Recreation Area |
| Lassen Volcanic National Park | Californie (Red Bluff ou Redding par l'ouest) | National Park |
| Lava Beds National Monument | Californie (Tulelake) | National Monument |
| Lewis & Clark National Historic Trail | (Tulelake) | National Historic Trail |
| Lincoln Boyhood National Memorial | Indiana (Lincoln City) | National Memorial |
| Lincoln Home National Historic Site | Illinois (Springfield) | National Historic Site |
| Lincoln Memorial | Columbia (district) (Washington) | Memorial |
| Little Bighorn Battlefield National Monument | Montana (Billings) | National Monument |
| Little River Canyon National Preserve | Alabama (Fort Payne) | National Preserve |
| Longfellow National Historic Site | Massachusetts (Cambridge) | National Historic Site |
| Lost Dutchman State Park | Arizona (Apache Junction) | State Park |
| Lowell National Historical Park | Massachusetts (Lowell) | National Historical Park |
| Lower East Side Tenement Museum National Historic Site | New York (Manhattan) | National Historic Site |
| Lyndon B Johnson National Historical Park | Texas (Johnson City) | National Historical Park |
| Lyndon Baines Johnson Memorial Grove on the Potomac | Virginie (Arlington) |
