Mountrail County has 5,753 wells in the NDIC well file — 3,700 of them producing today (3,700 oil, 0 gas), 240 permitted, 0 spudded but not yet completed, and 823 plugged and abandoned. The most active operator by well count is Hess Bakken Investments Ii, LLC. Figures come from the 2026-09-29 NDIC bulk file; production runs through 2026-07.
| Operator | Wells |
|---|---|
| Hess Bakken Investments Ii, LLC | 1,034 |
| Eog Resources, INC. | 949 |
| Whiting Oil And Gas Corporation | 835 |
| Slawson Exploration Company, INC. | 598 |
| Marathon Oil Company | 329 |
| Oasis Petroleum North America LLC | 326 |
| Devon Energy Williston, L.l.c. | 311 |
| Hunt Oil Company | 192 |
| Continental Resources, INC. | 177 |
| Silver Hill Energy Operating, LLC | 86 |
| Field | Wells |
|---|---|
| Sanish | 1,000 |
| Parshall | 853 |
| Alger | 490 |
| Big Bend | 463 |
| Alkali Creek | 339 |
| Reunion Bay | 317 |
| Robinson Lake | 262 |
| Stanley | 248 |