Fallon County has 2,769 wells in the MBOGC well file — 1,246 of them producing today (342 oil, 904 gas), 11 permitted, 0 spudded but not yet completed, and 722 plugged and abandoned. The most active operator by well count is Ridge Oil & Gas, LLC. Figures come from the 2026-09-29 MBOGC bulk file; production runs through 2026-08.
| Operator | Wells |
|---|---|
| Ridge Oil & Gas, LLC | 940 |
| Mmgl Mt I, LLC | 884 |
| Wbi Energy Transmission, INC. | 199 |
| Shell Oil Company | 76 |
| Fidelity Exploration & Production Co. | 71 |
| Shell Western E & P INC. | 66 |
| Mon-Dak Utilities Co. & Fidelity Gas Co. | 60 |
| Williston Basin Interstate Pipeline Company | 59 |
| Encore Operating LP | 51 |
| Denbury Onshore, LLC | 34 |
| Field | Wells |
|---|---|
| Cedar Creek | 1,308 |
| Pennel | 376 |
| Cabin Creek | 238 |
| Lookout Butte, East, Unit | 165 |
| Lookout Butte | 110 |
| Little Beaver | 79 |
| Little Beaver, East | 57 |
| Monarch | 48 |