California - Criteria: C (architecture/engineering)
| 10th Street Market |
| 500 Varas Square-Government Reserve |
| Acacia Lodge |
| Adamson House |
| Administration Building, Atascadero Colony |
| Administration Building, Sherman Institute |
| Administration Building, Treasure Island |
| Agnews Insane Asylum |
| Ahwahnee Hotel |
| Ainsley, John Colpitts, House No. 3 |
| Ainsworth, Lewis, House |
| A. K. Smiley Public Library |
| Alameda City Hall |
| Alameda County Building and Loan Association Building |
| Alameda Free Library |
| Alameda High School |
| Alameda Veterans' Memorial Building |
| Albion River Bridge |
| Alexander-Acacia Bridge |
| Alexander, Dr. Franz, House |
| Alexander Theatre |
| Alexandria Hotel and Annex |
| Alford-Nielson House |
| Alkali Flat Central Historic District |
| Alkali Flat North Historic District |
| Alkali Flat West Historic District |
| Allen-Sommer-Gage House |
| Allen, Theophilus, House |
| All Souls Universalist Church |
| Al Malaikah Temple |
| ALMA (Scow Schooner) |
| Altaville Grammar School |
| Alvarado Park |
| Alvarado Terrace Historic District |
| Alviso, Jose Maria, Adobe |
| Amador County Hospital Building |
| American Bag Co.-Union Hide Co. |
| American Cash Apartments-American Cash Store |
| Americanization School |
| American Trona Corporation Building |
| Anacapa Island Light Station |
| Anaheim Orange and Lemon Association Packing House |
| Andalucia Building |
| Andalusia |
| Anderton Court Shops |
| Andreasen, F. W.-John Rossen House |
| Andrews, William, House |
| Angel Island, U.S. Immigration Station |
| Angels Flight Railway |
| Angelus Mesa Branch |
| Animal Science Building |
| Anna Head School for Girls |
| Antelope Valley Indian Museum |
| Anza House |
| Aquatic Park Historic District |
| Archeological Site CA-INY-134 |
| Archeological Site CA-SBR-140 |
| Archeological Site No. D-4 |
| Archeological Site No. E-21 |
| Archeological Sites CA-RIV-504 and CA-RIV-773 |
| Ard Eevin |
| Arlington Branch Library and Fire Hall |
| Armory Hall |
| Armour & Co. Building |
| Arroyo Grande IOOF Hall |
| Arroyo Seco Parkway Historic District |
| Artz Building |
| Ash Mountain Entrance Sign |
| Ashworth-Remillard House |
| Atchison, Topeka and Santa Fe Railway Passenger and Freight Depot |
| Atchison, Topeka, and Santa Fe Railway Steam Locomotive No. 3751 |
| Atherton House |
| Atkinson House |
| Auburn City Hall and Fire House |
| Auburn Fire House No. 1 |
| Auburn Fire House No. 2 |
| Auburn Grammar School |
| Auburn Masonic Temple |
| Auburn Public Library |
| Audiffred Building |
| Auditorium |
| Auerbacher Home |
| Avenel Cooperative Housing Project |
| Azteca Theater |
| Aztec Hotel |
| Bachelder, Thomas Foxwell, Barn |
| Backs, Ferdinand, House |
| Baker and Hamilton |
| Baker Highway Maintenance Station |
| Baker House |
| Baker, Pearl, Row House |
| Bakersfield California Building |
| Balboa Inn |
| Balboa Park |
| Balboa Pavilion |
| Balboa Theatre |
| Baldwin Hills Village |
| Bale Mill |
| Bandy House |
| Bank of Eureka Building |
Data from United States Park Service and Wikidata
