| Rank | County | Production Period | Oil Production |
|---|---|---|---|
| #2 | Los Angeles County, CA | Sep 2025 | 579.6k BBLs |
| #3 | Ventura County, CA | Sep 2025 | 359.8k BBLs |
| #4 | Fresno County, CA | Sep 2025 | 293.8k BBLs |
| #5 | Monterey County, CA | Sep 2025 | 166.9k BBLs |
| #6 | Santa Barbara County, CA | Sep 2025 | 153.4k BBLs |
| #7 | Orange County, CA | Sep 2025 | 139.9k BBLs |
| #8 | San Luis Obispo County, CA | Sep 2025 | 50k BBLs |
| #9 | Kings County, CA | Sep 2025 | 7.0k BBLs |
| #10 | Tulare County, CA | Sep 2025 | 1.7k BBLs |
| #11 | Santa Clara County, CA | Sep 2025 | 696 BBLs |
| #12 | San Benito County, CA | Sep 2025 | 605 BBLs |
| #13 | San Bernardino County, CA | Sep 2025 | 340 BBLs |
| Rank | County | Production Period | Gas Production |
|---|---|---|---|
| #10 | Santa Barbara County, CA | Sep 2025 | 118.9k MCF |
| #11 | Glenn County, CA | Sep 2025 | 90.3k MCF |
| #12 | Sacramento County, CA | Sep 2025 | 78.4k MCF |
| #13 | Orange County, CA | Sep 2025 | 60.9k MCF |
| #14 | Fresno County, CA | Sep 2025 | 28k 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 | 20.6k MCF |
| #18 | Kings County, CA | Sep 2025 | 7.9k MCF |
| #19 | Monterey County, CA | Sep 2025 | 7.9k MCF |
| #20 | San Bernardino County, CA | Sep 2025 | 3.6k MCF |
| #21 | Yolo County, CA | Sep 2025 | 3.1k MCF |