California - Significance region: Local
| Juarez, Cayetano, Adobe |
| Judah, Theodore, School |
| Judge Lee House |
| Judson and Brown Ditch |
| Kaehler-Rector House |
| Kahn's Department Store |
| Karasik House |
| Kearney, M. Theo, Park and Mansion |
| Kee House |
| Kee, Sam, Laundry Building |
| Kelton Apartments |
| Kenaston House |
| Kerckoff Building and Annex |
| Kern Branch, Beale Memorial Library |
| Ketchum, Billy, House |
| Keyes Bungalow |
| Key, George, Ranch |
| Keys Desert Queen Ranch |
| Kight, Morris, House |
| Killefer, Lydia D., School |
| Killingsworth, Brady, & Smith |
| Kindel Building |
| Kindler, Paul, House |
| King Edward Hotel |
| Kingen Hotel |
| Kirk Creek Campground |
| Kirkwood Lake Tract |
| Kleiser, James, House |
| Knapp Cabin |
| Knipp and Stengel Ranch Barn |
| Kocher-Samson Building |
| Koerner House |
| Kohl Mansion |
| Koshland House |
| Kosy Knook Court |
| Kottinger, John W., Adobe Barn |
| Kraemer, Samuel, Building (American Savings Bank/First National Bank) |
| Kraft, Herbert, Memorial Free Library |
| Kress, George R., House |
| Kreuzer Ranch |
| Krisel Tract Home, 1882 S. Caliente Road (APN 511032005-9) |
| Kroger-Melrose District |
| Krotoszyner, Dr. Martin M., Medical Offices and House |
| Krough House |
| Kruger House |
| Kuchamaa |
| Kuchler Row |
| Kwaaymii Homeland |
| La Belle Tour |
| La Casa Alvarado |
| La Casa Del Rey |
| La Casa Primera de Rancho San Jose |
| Lacey, Friend, House |
| Ladies' Relief Society Children's Home |
| Lafayette Hotel |
| Lais, Charles, House |
| La Jolla Park Coastal Historic District |
| La Jolla Post Office |
| Lake County Courthouse |
| Lake Norconian Club |
| Lakeport Carnegie Library |
| Lake Vernon Snow Survey Shelter |
| La Laguna de San Gabriel |
| La Loma Bridge |
| Landrum, Andrew J., House |
| Lanfair Corral |
| Lantarnam Hall |
| Lanterman House |
| La Puente Valley Woman's Club |
| Larkmead Winery |
| Larkspur Downtown Historic District |
| Larsen Family House |
| Las Casitas Court |
| Lassen County Court House |
| Lathrop House |
| Laughlin, James H. and Frances E., House |
| Lautner, John and Mary, House |
| Lawrence Warehouse |
| Laws Narrow Gauge Railroad Historic District |
| LCS-102 (landing craft support) |
| Leadfield |
| Lederer, Gus, Site |
| Lee, Don, Building |
| Lee, Fong, Company |
| Lee, Robert E., Hotel |
| Leggett House |
| Leggett, Thomas H., House |
| Leib Carriage House |
| Leonis Adobe |
| Le Petit Trianon |
| Lettunich Building |
| LEWIS ARK (Houseboat) |
| Lewiston Historic District |
| Libby, Charles, House |
| Libby McNeil and Libby Fruit and Vegetable Cannery |
| Liberty Street Historic District |
| Lincoln, Abraham, Elementary School |
| Lincoln Heights Branch |
| Lincoln Park Historic District |
| Lincoln Place Apartments |
Data from United States Park Service and Wikidata
