| Rank | County | Production Period | Oil Production |
|---|---|---|---|
| #1 | Richland County, MT | Apr 2026 | 1.4M BBLs |
| #2 | Roosevelt County, MT | Apr 2026 | 566.5k BBLs |
| #3 | Powder River County, MT | Apr 2026 | 73k BBLs |
| #4 | Sheridan County, MT | Apr 2026 | 27.5k BBLs |
| #5 | Blaine County, MT | Apr 2026 | 19.9k BBLs |
| #6 | Carbon County, MT | Apr 2026 | 18.3k BBLs |
| #7 | Glacier County, MT | Apr 2026 | 16.4k BBLs |
| #8 | Fallon County, MT | Apr 2026 | 16.4k BBLs |
| #9 | Toole County, MT | Apr 2026 | 10.7k BBLs |
| #10 | Rosebud County, MT | Apr 2026 | 4.1k BBLs |
| #11 | Valley County, MT | Apr 2026 | 3.8k BBLs |
| #12 | Big Horn County, MT | Apr 2026 | 3.0k BBLs |
| Rank | County | Production Period | Gas Production |
|---|---|---|---|
| #8 | Carbon County, MT | Apr 2026 | 78.3k MCF |
| #9 | Glacier County, MT | Apr 2026 | 70.5k MCF |
| #10 | Valley County, MT | Apr 2026 | 42.2k MCF |
| #11 | Chouteau County, MT | Apr 2026 | 32.9k MCF |
| #12 | Liberty County, MT | Apr 2026 | 32.7k MCF |
| #13 | Sheridan County, MT | Apr 2026 | 12k MCF |
| #14 | Wibaux County, MT | Apr 2026 | 10.6k MCF |
| #15 | Dawson County, MT | Apr 2026 | 607 MCF |
| #16 | Powder River County, MT | Apr 2026 | 605 MCF |
| #17 | Rosebud County, MT | Apr 2026 | 574 MCF |
| #18 | Fergus County, MT | Apr 2026 | 533 MCF |
| #19 | Teton County, MT | Apr 2026 | 155 MCF |