California - Significance region: Local
| Hotel Green |
| Hotel La Rose |
| Hotel Lenhart |
| Hotel Lodi |
| Hotel Macdoel |
| Hotel Mayfair |
| Hotel Menlo |
| Hotel Metropole |
| Hotel Montgomery |
| Hotel Regis |
| Hotel Rosslyn Annex |
| Hotel Sainte Claire |
| Hotel San Clemente |
| Hotel Senator |
| Hotel St. Matthew |
| Hotel Woodland |
| House at 1011 S. Madison Ave. |
| House at 1015 Prospect Boulevard |
| House at 1050 S. Madison Ave. |
| House at 1111 North Los Robles Avenue |
| House at 1121 North Los Robles Avenue |
| House at 1141 North Chester Avenue |
| House at 1233 Wentworth Ave. |
| House at 1239-1245 Scott Street |
| House at 1240 North Los Robles |
| House at 1249-1251 Scott Street |
| House at 1254-1256 Montgomery Street |
| House at 1321 Scott Street |
| House at 1331-1335 Scott Street |
| House at 1360 Lida Street |
| House at 1487 Loma Vista Street |
| House at 380 W. Del Mar Blvd. |
| House at 530 S. Marengo Avenue |
| House at 574 Bellefontaine St. |
| House at 584 Page Street |
| House at 674 Elliot Drive |
| Howard Motor Company Building |
| Howard-Ralston Eucalyptus Tree Rows |
| Howe, Edward P., Jr., House |
| Howell House |
| Howe-Waffle House and Carriage House |
| Hoyt-Scott House |
| Hubbard-Upson House |
| Humboldt Bay Woolen Mill |
| Hunt Center and Library |
| Hunt House |
| Huntington Beach Elementary School Gymnasium and Plunge |
| Huntington Beach Municipal Pier |
| Huntington Beach Public Library on Triangle Park |
| Hutton, Warner, House |
| Hyde House |
| Hyde, Jeremiah D. and Mary, House |
| Immanuel Evangelical Lutheran Church of Alameda |
| Imperial Theatre |
| Independence Hall |
| Independent Order of Odd Fellows Building |
| Indian Stone Corral |
| Initial Point of Boundary Between U.S. and Mexico |
| Inskip Hotel |
| Inspiration Heights Historic District |
| Institute of Geophysics and Planetary Physics |
| Integratron |
| Intercultural Council Houses |
| International Hotel |
| Inyo County Courthouse |
| Ione City Centenary Church |
| I.O.O.F. Building |
| I.O.O.F. Hall |
| IOOF Lodge #355 |
| Irvine Bean and Growers Association Building |
| Irvine Blacksmith Shop |
| Irvine Park |
| Irving, Washington, Branch |
| I Street Bridge |
| Italian Hotel |
| Iverson House |
| Jack, Robert, House |
| Jackson Brewing Company |
| Jackson Downtown Historic District |
| Jackson, Helen Hunt, Branch |
| Jackson Square Historic District |
| Jacoby Building |
| Janssen, E., Building |
| Janssens-Orella-Birk Building |
| Japanese YWCA |
| Jarvis, Benjamin, House |
| Jastro Building |
| Jefferson Branch |
| Jefferson, Thomas, Elementary School |
| Jefferson, Thomas, School |
| Jensen, Cornelius, Ranch |
| Jersey Bridge |
| Jessie Street Substation |
| Jess Valley Schoolhouse |
| Johnson, Hugh Edgar, House |
| Johnson-Taylor Ranch Headquarters |
| Johnston, Darius David, House |
| Jones, A. Quincy, Barn |
| Jordan, Orin, House |
| Jorgenson, Chris, Studio |
Data from United States Park Service and Wikidata
