| Rank | County | Production Period | Oil Production |
|---|---|---|---|
| #2 | Los Angeles County, CA | Mar 2026 | 390.3k BBLs |
| #3 | Ventura County, CA | Mar 2026 | 358.9k BBLs |
| #4 | Monterey County, CA | Mar 2026 | 157.5k BBLs |
| #5 | Fresno County, CA | Mar 2026 | 154.4k BBLs |
| #6 | Orange County, CA | Mar 2026 | 139.1k BBLs |
| #7 | Santa Barbara County, CA | Mar 2026 | 135.6k BBLs |
| #8 | San Luis Obispo County, CA | Mar 2026 | 41.1k BBLs |
| #9 | Kings County, CA | Mar 2026 | 3.7k BBLs |
| #10 | San Benito County, CA | Mar 2026 | 1.1k BBLs |
| #11 | Tulare County, CA | Mar 2026 | 925 BBLs |
| #12 | Santa Clara County, CA | Mar 2026 | 902 BBLs |
| #13 | San Bernardino County, CA | Mar 2026 | 513 BBLs |
| Rank | County | Production Period | Gas Production |
|---|---|---|---|
| #13 | Orange County, CA | Mar 2026 | 55.9k MCF |
| #14 | Monterey County, CA | Mar 2026 | 47.8k MCF |
| #15 | Contra Costa County, CA | Mar 2026 | 37.1k MCF |
| #16 | Humboldt County, CA | Mar 2026 | 24k MCF |
| #17 | Tehama County, CA | Mar 2026 | 23.3k MCF |
| #18 | Fresno County, CA | Mar 2026 | 21k MCF |
| #19 | San Luis Obispo County, CA | Mar 2026 | 18.6k MCF |
| #20 | San Bernardino County, CA | Mar 2026 | 3.2k MCF |
| #21 | Yolo County, CA | Mar 2026 | 2.7k MCF |
| #22 | San Benito County, CA | Mar 2026 | 1.5k MCF |
| #23 | Kings County, CA | Mar 2026 | 1.3k MCF |
| #24 | Santa Clara County, CA | Mar 2026 | 906 MCF |