| Rank | County | Production Period | Oil Production |
|---|---|---|---|
| #5 | Monterey County, CA | May 2026 | 165k BBLs |
| #6 | Orange County, CA | May 2026 | 137.3k BBLs |
| #7 | Santa Barbara County, CA | May 2026 | 132.1k BBLs |
| #8 | San Luis Obispo County, CA | May 2026 | 43.7k BBLs |
| #9 | Kings County, CA | May 2026 | 2.7k BBLs |
| #10 | Tulare County, CA | May 2026 | 1.3k BBLs |
| #11 | Contra Costa County, CA | May 2026 | 1.2k BBLs |
| #12 | San Benito County, CA | May 2026 | 664 BBLs |
| #13 | San Bernardino County, CA | May 2026 | 476 BBLs |
| #14 | Sacramento County, CA | May 2026 | 291 BBLs |
| #15 | Santa Clara County, CA | May 2026 | 161 BBLs |
| #16 | Solano County, CA | May 2026 | 124 BBLs |
| Rank | County | Production Period | Gas Production |
|---|---|---|---|
| #1 | Kern County, CA | May 2026 | 7.3M MCF |
| #2 | Los Angeles County, CA | May 2026 | 880.8k MCF |
| #3 | San Joaquin County, CA | May 2026 | 395.6k MCF |
| #4 | Ventura County, CA | May 2026 | 388.2k MCF |
| #5 | Solano County, CA | May 2026 | 195.4k MCF |
| #6 | Sutter County, CA | May 2026 | 135.2k MCF |
| #7 | Santa Barbara County, CA | May 2026 | 133.2k MCF |
| #8 | Glenn County, CA | May 2026 | 109.2k MCF |
| #9 | Colusa County, CA | May 2026 | 105.6k MCF |
| #10 | Orange County, CA | May 2026 | 59.2k MCF |
| #11 | Sacramento County, CA | May 2026 | 55k MCF |
| #12 | Monterey County, CA | May 2026 | 45.9k MCF |