| Rank | County | Production Period | Oil Production |
|---|---|---|---|
| #2 | Orange County, CA | May 2020 | 192.4k BBLs |
| #3 | Los Angeles County, CA | May 2020 | 816.6k BBLs |
| #4 | Ventura County, CA | May 2020 | 365k BBLs |
| #5 | Monterey County, CA | May 2020 | 619.1k BBLs |
| #6 | Fresno County, CA | May 2020 | 458k BBLs |
| #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 |
| Rank | County | Production Period | Gas Production |
|---|---|---|---|
| #12 | Monterey County, CA | May 2020 | 80.6k MCF |
| #13 | Kings County, CA | May 2020 | 25.6k MCF |
| #14 | Butte County, CA | May 2020 | 25.1k MCF |
| #15 | Tehama County, CA | May 2020 | 30.1k MCF |
| #16 | Contra Costa County, CA | May 2020 | 7.7k MCF |
| #17 | Fresno County, CA | May 2020 | 50.9k MCF |
| #18 | San Luis Obispo County, CA | May 2020 | 28.7k MCF |
| #19 | Humboldt County, CA | May 2020 | 18.1k MCF |
| #20 | Madera County, CA | May 2020 | 8.7k MCF |
| #21 | Santa Clara County, CA | May 2020 | 1.5k MCF |
| #22 | San Benito County, CA | May 2020 | 1.1k MCF |
| #23 | Yolo County, CA | May 2020 | 949 MCF |