| Rank | County | Production Period | Oil Production |
|---|---|---|---|
| #1 | Kern County, CA | Mar 2026 | 5.6M BBLs |
| #2 | Los Angeles County, CA | Mar 2026 | 553.2k BBLs |
| #3 | Ventura County, CA | Mar 2026 | 366.5k BBLs |
| #4 | Fresno County, CA | Mar 2026 | 288.2k BBLs |
| #5 | Monterey County, CA | Mar 2026 | 157.9k BBLs |
| #6 | Orange County, CA | Mar 2026 | 150.6k BBLs |
| #7 | Santa Barbara County, CA | Mar 2026 | 135.7k BBLs |
| #8 | San Luis Obispo County, CA | Mar 2026 | 44.4k BBLs |
| #9 | Kings County, CA | Mar 2026 | 3.8k BBLs |
| #10 | Contra Costa County, CA | Mar 2026 | 1.3k BBLs |
| #11 | San Benito County, CA | Mar 2026 | 1.1k BBLs |
| #12 | Tulare County, CA | Mar 2026 | 925 BBLs |
| Rank | County | Production Period | Gas Production |
|---|---|---|---|
| #1 | Kern County, CA | Mar 2026 | 7.3M MCF |
| #2 | Los Angeles County, CA | Mar 2026 | 4.6M MCF |
| #3 | Madera County, CA | Mar 2026 | 1.1M MCF |
| #4 | Santa Barbara County, CA | Mar 2026 | 878.3k MCF |
| #5 | Colusa County, CA | Mar 2026 | 617.7k MCF |
| #6 | Ventura County, CA | Mar 2026 | 376k MCF |
| #7 | San Joaquin County, CA | Mar 2026 | 150.1k MCF |
| #8 | Sutter County, CA | Mar 2026 | 130k MCF |
| #9 | Butte County, CA | Mar 2026 | 90.9k MCF |
| #10 | Glenn County, CA | Mar 2026 | 86.2k MCF |
| #11 | Solano County, CA | Mar 2026 | 78.9k MCF |
| #12 | Sacramento County, CA | Mar 2026 | 78.4k MCF |