Custer County has 228 wells in the MBOGC well file — 0 of them producing today (0 oil, 0 gas), 0 permitted, 0 spudded but not yet completed, and 220 plugged and abandoned. The most active operator by well count is Andrau, W. E.. Figures come from the 2026-09-29 MBOGC bulk file; production runs through 2026-08.
| Operator | Wells |
|---|---|
| Andrau, W. E. | 21 |
| Wolf Exploration | 14 |
| El Paso Natural Gas Company | 11 |
| Beer O. N. & John R. | 10 |
| Gas Producing Enterprises | 7 |
| Gary Energy Corporation | 6 |
| North Central Oil Corp. | 6 |
| Montana Oil & Gas, LLC | 5 |
| Ozark Corp. | 5 |
| Stanolind Oil & Gas Co. | 5 |
| Field | Wells |
|---|---|
| Liscom Creek | 11 |
| Wildcat Custer | 3 |
| Pumpkin Creek | 1 |
| Mizpah | 1 |