California - Area of significance: Social History
| Independence Hall |
| Independent Order of Odd Fellows Building |
| Intercultural Council Houses |
| International Hotel |
| I.O.O.F. Building |
| I.O.O.F. Hall |
| IOOF Lodge #355 |
| Irving, Washington, Branch |
| Jackson Downtown Historic District |
| Jackson, Helen Hunt, Branch |
| Janssens-Orella-Birk Building |
| Japanese YWCA |
| Jefferson Branch |
| Jess Valley Schoolhouse |
| John Muir National Historic Site |
| Johnston, Darius David, House |
| Kight, Morris, House |
| Killefer, Lydia D., School |
| Kimberly Crest |
| King Edward Hotel |
| Kraft, Herbert, Memorial Free Library |
| Krotoszyner, Dr. Martin M., Medical Offices and House |
| La Belle Tour |
| Ladies' Relief Society Children's Home |
| La Jolla Women's Club |
| La Puente Valley Woman's Club |
| Las Flores Estancia |
| Lee, Fong, Company |
| Le Petit Trianon |
| Lightship WAL-605, RELIEF |
| Lincoln Heights Branch |
| Lincoln Place Apartments |
| Lincoln Public Library |
| Lincoln School |
| Locke Historic District |
| Lompoc Public Library |
| Lompoc Veterans Memorial Building |
| Lopez Adobe |
| Los Angeles City Hall |
| Los Angeles Nurses' Club |
| Los Angeles Plaza Historic District |
| Los Banos del Mar |
| Los Rios Street Historic District |
| Lotta Crabtree Fountain |
| Lower Nob Hill Apartment Hotel District |
| Luiseno Ancestral Origin Landscape |
| Lummis House |
| Magalia Community Church |
| Malabar Branch |
| Malakoff Diggins-North Bloomfield Historic District |
| Manzanar War Relocation Center, National Historic Site |
| Marconi Wireless-Synanon Tomales Bay Headquarters Historic District |
| Marin Art and Garden Center |
| Marin City Public Housing |
| Mariposa Grove Museum |
| Marsh, John, House |
| Mar Vista Gardens |
| Masonic Temple |
| Masonic Temple and Lodge |
| Masonic Temple-Naval Lodge No. 87, Free and Accepted Masons |
| Maulhardt, Gottfried, Farm |
| Maywood Woman's Club |
| McDonald Mansion |
| McHenry Mansion |
| Meek Mansion and Carriage House |
| Melrose-Backs Neighborhood Houses |
| Memorial Branch |
| Memorial Hall |
| Methodist Episcopal Church of Pescadero |
| Milano Hotel |
| Mildred Ann Archeological Site |
| Mill Creek Zanja |
| Minerva Club of Santa Maria |
| Mission Beach Roller Coaster |
| Mission Cultural Center |
| Mission San Jose |
| Mission Santa Ines |
| Monday Club of San Luis Obispo |
| Moneta Branch |
| Montebello Woman's Club |
| Monterey County Jail |
| Mountain View Adobe |
| Mud Creek Canyon |
| Muir, John, Branch |
| Munk, Walter and Judith, House |
| Murphy, D. J., House |
| Murphys Grammar School |
| Murphys Hotel |
| Napa Abajo-Fuller Park Historic District |
| Napa County Infirmary |
| National Chicano Moratorium March August 29, 1970 |
| National Farm Workers Association Headquarters |
| Nelson Springs |
| Nevada City Free Public Library |
| New City of Mentalphysics Historic District |
| New Helvetia Historic District |
| New Hotel Carquinez |
| Nicholson, Grace, Building |
| Nippon Hospital |
| North Hollywood Branch |
Data from United States Park Service and Wikidata
