| County | Holding Institution |
| Alameda County | UC Berkeley |
| Alpine County | UC Berkeley |
| Amador County | UC Davis |
| Amador County foothills, Mtn. | UC Berkeley |
| Butte County | UC Davis |
| Calaveras County | UC Berkeley |
| Colusa County | UC Davis |
| Contra Costa County | UC Berkeley |
| Del Norte County | UC Berkeley |
| El Dorado County | UC Berkeley |
| Fresno County | UC Davis |
| Fresno County (Foothills, Mtns) | UC Berkeley |
| Glenn County | UC Davis |
| Humboldt County | UC Berkeley |
| Imperial County | UC San Diego |
| Inyo County | UC Berkeley |
| Kern County | UC Davis |
| Kern County (Foothills, Mtns) | UC Berkeley |
| Kings County | UC Davis, UCLA |
| Lake County | UC Berkeley |
| Lassen County | UC Berkeley |
| Los Angeles County | UCLA |
| Madera County | UC Davis, UC Berkeley |
| Marin County | UC Berkeley |
| Mariposa County | UC Berkeley |
| Mendocino County | UC Berkeley |
| Merced County | UC Davis |
| Modoc County | UC Berkeley |
| Mono County | UC Berkeley |
| Monterey County | UC Santa Cruz |
| Napa County | UC Berkeley |
| Nevada County | UC Berkeley |
| Orange County | UC Irvine |
| Placer County | UC Davis |
| Plumas County | UC Berkeley |
| Riverside County | UC Riverside |
| Sacramento County | UC Davis |
| San Benito County | UC Santa Cruz |
| San Bernardino County | UC Riverside |
| San Diego County | UC San Diego |
| San Francisco County | UC Berkeley |
| San Joaquin County | UC Davis |
| San Luis Obispo County | UC Santa Barbara |
| San Mateo County | UC Santa Cruz, Stanford U. |
| Santa Barbara County | UC Santa Barbara |
| Santa Clara County | UC Santa Cruz |
| Santa Cruz County | UC Santa Cruz |
| Shasta County | UC Berkeley |
| Sierra County | UC Berkeley |
| Siskiyou County | UC Berkeley |
| Solano County | UC Davis |
| Sonoma County | UC Berkeley |
| Stanislaus County | UC Davis |
| Sutter County | UC Davis |
| Tehama County | UC Davis |
| Trinity County | UC Berkeley |
| Tulare County | UC Davis |
| Tuolumne County | UC Berkeley |
| Ventura County | UC Santa Barbara |
| Yolo County | UC Davis |
| Yuba County | UC Davis |
