Glacier County has 3,257 wells in the MBOGC well file — 597 of them producing today (390 oil, 207 gas), 3 permitted, 0 spudded but not yet completed, and 1,700 plugged and abandoned. The most active operator by well count is New Horizon Resources LLC. Figures come from the 2026-09-29 MBOGC bulk file; production runs through 2026-08.
| Operator | Wells |
|---|---|
| New Horizon Resources LLC | 818 |
| Montalban Oil & Gas Operations, INC. | 282 |
| Fx Drilling Company, INC. | 262 |
| Union Oil Company Of California | 119 |
| Cut Bank Resources, INC. | 105 |
| Texaco Exploration And Production INC. | 87 |
| Mogo Reagan, LLC | 87 |
| Quicksilver Resources, INC. | 73 |
| K2 America Corporation | 64 |
| Carter Oil Co. | 62 |
| Field | Wells |
|---|---|
| Cut Bank | 2,150 |
| Graben Coulee | 110 |
| Reagan | 88 |
| Big Rock | 53 |
| Red Creek | 52 |
| Little Rock | 34 |
| Landslide Butte | 26 |
| Blackfoot | 25 |