| Rank | County | Production Period | Oil Production |
|---|---|---|---|
| #2 | Los Angeles County, CA | Sep 2025 | 626k BBLs |
| #3 | Ventura County, CA | Sep 2025 | 365.6k BBLs |
| #4 | Fresno County, CA | Sep 2025 | 350.7k BBLs |
| #5 | Monterey County, CA | Sep 2025 | 245.9k BBLs |
| #6 | Orange County, CA | Sep 2025 | 157.8k BBLs |
| #7 | Santa Barbara County, CA | Sep 2025 | 153.8k BBLs |
| #8 | San Luis Obispo County, CA | Sep 2025 | 53.6k BBLs |
| #9 | Kings County, CA | Sep 2025 | 7.4k BBLs |
| #10 | Tulare County, CA | Sep 2025 | 2.0k BBLs |
| #11 | Contra Costa County, CA | Sep 2025 | 1.6k BBLs |
| #12 | San Benito County, CA | Sep 2025 | 798 BBLs |
| #13 | Santa Clara County, CA | Sep 2025 | 696 BBLs |
| Rank | County | Production Period | Gas Production |
|---|---|---|---|
| #10 | Santa Barbara County, CA | Sep 2025 | 119.4k MCF |
| #11 | Glenn County, CA | Sep 2025 | 95k MCF |
| #12 | Sacramento County, CA | Sep 2025 | 85.6k MCF |
| #13 | Orange County, CA | Sep 2025 | 74.1k MCF |
| #14 | Fresno County, CA | Sep 2025 | 28.7k MCF |
| #15 | Tehama County, CA | Sep 2025 | 24.8k MCF |
| #16 | San Luis Obispo County, CA | Sep 2025 | 23.9k MCF |
| #17 | Humboldt County, CA | Sep 2025 | 22.6k MCF |
| #18 | Monterey County, CA | Sep 2025 | 16.2k MCF |
| #19 | Kings County, CA | Sep 2025 | 8.7k MCF |
| #20 | San Bernardino County, CA | Sep 2025 | 3.6k MCF |
| #21 | Yolo County, CA | Sep 2025 | 3.1k MCF |