| Rank | County | Production Period | Oil Production |
|---|---|---|---|
| #7 | Santa Barbara County, CA | May 2020 | 158.6k BBLs |
| #8 | San Luis Obispo County, CA | May 2020 | 36.8k BBLs |
| #9 | Kings County, CA | May 2020 | 10.4k BBLs |
| #10 | Contra Costa County, CA | May 2020 | 4.9k BBLs |
| #11 | Santa Clara County, CA | May 2020 | 1.6k BBLs |
| #12 | Sacramento County, CA | May 2020 | 664 BBLs |
| #13 | San Benito County, CA | May 2020 | 833 BBLs |
| #14 | Alameda County, CA | May 2020 | 680 BBLs |
| #19 | Solano County, CA | May 2020 | 118 BBLs |
| #25 | Tulare County, CA | May 2020 | 1.8k BBLs |
| #26 | San Bernardino County, CA | May 2020 | 641 BBLs |
| #27 | San Mateo County, CA | May 2020 | 4 BBLs |
| Rank | County | Production Period | Gas Production |
|---|---|---|---|
| #1 | Kern County, CA | May 2020 | 9.9M MCF |
| #2 | Los Angeles County, CA | May 2020 | 3.7M MCF |
| #3 | Sutter County, CA | May 2020 | 171.5k MCF |
| #4 | San Joaquin County, CA | May 2020 | 368.2k MCF |
| #5 | Ventura County, CA | May 2020 | 388.2k MCF |
| #6 | Sacramento County, CA | May 2020 | 140.1k MCF |
| #7 | Colusa County, CA | May 2020 | 131.7k MCF |
| #8 | Glenn County, CA | May 2020 | 124.6k MCF |
| #9 | Orange County, CA | May 2020 | 84.8k MCF |
| #10 | Santa Barbara County, CA | May 2020 | 328.4k MCF |
| #11 | Solano County, CA | May 2020 | 67.6k MCF |
| #12 | Monterey County, CA | May 2020 | 80.6k MCF |