California - Criteria: C (architecture/engineering)
| Holloway, Edgar, House |
| Hollywood Boulevard Commercial and Entertainment District |
| Hollywood Cemetery |
| Hollywood High School Historic District |
| Hollywood Masonic Temple |
| Hollywood Melrose Hotel |
| Hollywood Palladium |
| Hollywood Studio Club |
| Hollywood Western Building, The |
| Holmes-Shannon House |
| Holy Trinity Armenian Apostolic Church |
| Home Economics Building |
| Home Laundry |
| Honey Run Covered Bridge |
| Honigsberger Store |
| Hood, Mrs. J.H., House |
| Hoopa Valley Adobe |
| Hoover Hotel |
| Hoover, Lou Henry, House |
| Hope, Thomas, House |
| Horatio West Court |
| Horseshoe Lake Ranger Station |
| Hospital Bridge |
| Hostess House |
| Hotel Arcata |
| Hotel Californian |
| Hotel Chancellor |
| Hotel Covell |
| Hotel Del Coronado |
| Hotel Fresno |
| Hotel Glendale |
| Hotel Green |
| Hotel La Rose |
| Hotel Macdoel |
| Hotel Metropole |
| Hotel Montgomery |
| Hotel Regis |
| Hotel Rosslyn Annex |
| Hotel Sainte Claire |
| Hotel San Clemente |
| Hotel Senator |
| Hotel St. Matthew |
| Hotel Stockton |
| 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 Life-Saving Station |
| Humboldt Bay Woolen Mill |
| Hunter-Dulin Building |
| Hunters Point Commercial Drydock Historic District |
| Huntington Beach Municipal Pier |
| Huntington Beach Public Library on Triangle Park |
| Hutton, Warner, House |
| Hyde House |
| Independent Order of Odd Fellows Building |
| Integratron |
| Inyo County Courthouse |
| Ione City Centenary Church |
| I.O.O.F. Building |
| I.O.O.F. Hall |
| Irvine Bean and Growers Association Building |
| Irvine Blacksmith Shop |
| Irvine Park |
| Irving, Washington, Branch |
| Isleton Chinese and Japanese Commercial Districts |
| I Street Bridge |
| Iverson House |
| Jackson, Helen Hunt, Branch |
| Jackson Square Historic District |
| Jacoby Building |
| Janssen, E., Building |
| Janssens-Orella-Birk Building |
| Jardinette Apartments |
| Jarvis, Benjamin, House |
| Jastro Building |
| Jefferson Branch |
Data from United States Park Service and Wikidata
