| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Damar Resc Incor | Oil Operator | Oct 1995 | |
| 2 | Darrah John J Jr | Oil & Gas Operator | Oct 1994 | |
| 3 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Sep 2024 |
| 4 | Double 'B' Oil I | Oil Operator | Feb 1992 | |
| 5 | Double G Petro LLC | Oil Operator | Jul 2024 | |
| 6 | Downing-Nelson Oil Co Inc | Hays, KS 67601 | Oil & Gas Operator | Jul 2024 |
| 7 | Dreiling Oil Inc | Hays, KS 67601 | Oil Operator | Jun 2018 |