| Rank | County | Production Period | Oil Production |
|---|---|---|---|
| #1 | Kern County, CA | Sep 2025 | 6.3M BBLs |
| #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 |
| Rank | County | Production Period | Gas Production |
|---|---|---|---|
| #1 | Los Angeles County, CA | Sep 2025 | 2.5M MCF |
| #2 | San Joaquin County, CA | Sep 2025 | 1.8M MCF |
| #3 | Kern County, CA | Sep 2025 | 1.3M MCF |
| #4 | Madera County, CA | Sep 2025 | 1.2M MCF |
| #5 | Butte County, CA | Sep 2025 | 902k MCF |
| #6 | Ventura County, CA | Sep 2025 | 541.9k MCF |
| #7 | Solano County, CA | Sep 2025 | 531.5k MCF |
| #8 | Colusa County, CA | Sep 2025 | 220.2k MCF |
| #9 | Sutter County, CA | Sep 2025 | 148.1k MCF |
| #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 |