Collection place
- CA-CCo-291, Richmond, Contra Costa County8 objects
- Unincorporated eastern Contra Costa County, California8 objects
- CA-CCo-141, Palm Tract, Contra Costa County7 objects
- CA-CCo-301, Richmond, Contra Costa County7 objects
- Palm Tract, Contra Costa County, California7 objects
- Point Isabel, Richmond, Contra Costa County7 objects
- Richmond Annex, Richmond, Contra Costa County7 objects
- CA-CCo-137, Pleasant Hill, Contra Costa County6 objects
- CA-CCo-259, Rodeo, Contra Costa County6 objects
- Pleasant Hill, Contra Costa County, California6 objects
- Rodeo, Contra Costa County, California6 objects
- Bethel Island, Contra Costa County, California5 objects
- Potrero San Pablo, Richmond, Contra Costa County5 objects
- San Joaquin River Delta, Contra Costa County, California5 objects
- CA-CCo-20, Bethel Island, Contra Costa County4 objects
- CA-CCo-227, Lafayette, Contra Costa County4 objects
- CA-CCo-267, Richmond, Contra Costa County4 objects
- Lafayette, Contra Costa County, California4 objects
- CA-CCo-283, Richmond, Contra Costa County3 objects
- Orinda, Contra Costa County, California3 objects