| Rank | County | Production Period | Oil Production |
|---|---|---|---|
| #2 | Los Angeles County, CA | May 2025 | 649k BBLs |
| #3 | Ventura County, CA | May 2025 | 368.9k BBLs |
| #4 | Fresno County, CA | May 2025 | 346.6k BBLs |
| #5 | Monterey County, CA | May 2025 | 254.4k BBLs |
| #6 | Orange County, CA | May 2025 | 161.2k BBLs |
| #7 | Santa Barbara County, CA | May 2025 | 157.9k BBLs |
| #8 | San Luis Obispo County, CA | May 2025 | 52.6k BBLs |
| #9 | Kings County, CA | May 2025 | 7.1k BBLs |
| #10 | Tulare County, CA | May 2025 | 2.2k BBLs |
| #11 | Santa Clara County, CA | May 2025 | 1.4k BBLs |
| #12 | Contra Costa County, CA | May 2025 | 916 BBLs |
| #13 | San Benito County, CA | May 2025 | 872 BBLs |
| Rank | County | Production Period | Gas Production |
|---|---|---|---|
| #10 | Sacramento County, CA | May 2025 | 84.1k MCF |
| #11 | Orange County, CA | May 2025 | 75.7k MCF |
| #12 | Fresno County, CA | May 2025 | 51k MCF |
| #13 | Monterey County, CA | May 2025 | 47.2k MCF |
| #14 | Solano County, CA | May 2025 | 40.5k MCF |
| #15 | Tehama County, CA | May 2025 | 26k MCF |
| #16 | San Luis Obispo County, CA | May 2025 | 24.4k MCF |
| #17 | Humboldt County, CA | May 2025 | 24.2k MCF |
| #18 | Kings County, CA | May 2025 | 15.4k MCF |
| #19 | San Bernardino County, CA | May 2025 | 3.7k MCF |
| #20 | Yolo County, CA | May 2025 | 3.0k MCF |
| #21 | San Benito County, CA | May 2025 | 1.2k MCF |