California - Criteria: A (event)
| Johnston, Darius David, House |
| Juarez, Cayetano, Adobe |
| Judson Studios |
| Kearney, M. Theo, Park and Mansion |
| Kee, Sam, Laundry Building |
| Kelso Depot, Restaurant and Employees Hotel |
| Kennedy Tailing Wheels |
| Kerckoff Building and Annex |
| Keys Desert Queen Ranch |
| Killefer, Lydia D., School |
| Kindel Building |
| Kings County Courthouse |
| Knapp Cabin |
| Knights Ferry |
| Knight's Foundry and Shops |
| Knipp and Stengel Ranch Barn |
| Koshland House |
| Kraft, Herbert, Memorial Free Library |
| Krug, Charles, Winery |
| Kruger House |
| Kuchamaa |
| Kuchler Row |
| La Belle Tour |
| La Casa Alvarado |
| La Casa Del Rey |
| Ladies' Relief Society Children's Home |
| Lafayette Hotel |
| La Jolla Post Office |
| La Jolla Women's Club |
| Lake Merritt Wild Duck Refuge |
| Lake Norconian Club |
| Lakeport Carnegie Library |
| Lake Tahoe Dam |
| Lake Vernon Snow Survey Shelter |
| La Loma Bridge |
| LANE VICTORY |
| La Puente Valley Woman's Club |
| La PurÃsima Mission |
| Lasky-DeMille Barn |
| Lassen County Court House |
| Lassen Volcanic National Park Highway Historic District |
| Lava Beds National Monument Archeological District |
| Lawrence Warehouse |
| LCS-102 (landing craft support) |
| Leadfield |
| LeConte Hall |
| LeConte Memorial Lodge |
| Leonis Adobe |
| Le Petit Trianon |
| Lettunich Building |
| Lewiston Historic District |
| Libby McNeil and Libby Fruit and Vegetable Cannery |
| Liberty Hall |
| Lick, James, Mill |
| Lightship WAL-605, RELIEF |
| Lincoln Heights Branch |
| Lincoln Public Library |
| Lincoln School |
| Lincoln Theater |
| Lisbon Winery |
| Little Tokyo Historic District |
| Live Oak Creamery |
| Live Oak Historic Commercial District |
| Livermore Carnegie Library and Park |
| Llano Road Roadhouse |
| Locke Historic District |
| Locke House and Barn |
| Locke's Meat Market |
| Lodi Arch |
| Lompoc Public Library |
| Looff Carousel and Roller Coaster on the Santa Cruz Beach Boardwalk |
| Loomis Vistor Center, Bldg. 43 |
| Lopez Adobe |
| Lorenz Hotel |
| Los Alamos Ranch House |
| Los Angeles Harbor Light Station |
| Los Angeles Memorial Coliseum |
| Los Angeles Nurses' Club |
| Los Angeles Pacific Company Ivy Park Substation |
| Los Angeles Plaza Historic District |
| Los Angeles Union Passenger Terminal |
| Los Banos del Mar |
| Los Gatos Historic Commercial District |
| Los Rios Street Historic District |
| Louie's Place |
| Lovejoy Homestead |
| Lower Blackburn Grade Bridge |
| Lower Klamath National Wildlife Refuge |
| Lower Nob Hill Apartment Hotel District |
| Lummis House |
| Lyford's Stone Tower |
| Lynwood Pacific Electric Railway Depot |
| Lyons Ranches Historic District |
| Madera County Courthouse |
| Madrona Knoll Rancho District |
| Magalia Community Church |
| Main Building |
| Main Street Historic Commercial District |
| Main Street Historic District-Winters |
| Malabar Branch |
Data from United States Park Service and Wikidata
