| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D & D Oil Company | Dayton, TX 77535 | Oil & Gas Operator | Oct 2025 |
| 2 | D H & L Operating, Inc. | Oil & Gas Operator | Sep 1983 | |
| 3 | D. B. McConnell | Oil & Gas Operator | Oct 1991 | |
| 4 | Danos Oil & Gas LLC | Oil & Gas Operator | Oct 2024 | |
| 5 | Decker & Associates | Oil & Gas Operator | Mar 1991 | |
| 6 | Dekasco, Inc. | Oil & Gas Operator | May 1990 | |
| 7 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 8 | Dewco Oil | Oil Operator | Jun 1996 | |
| 9 | Diamar Oil Company, Inc. | Oil Operator | Nov 1983 | |
| 10 | Dilligas, Inc. | Oil Operator | May 1990 | |
| 11 | Don Webb | Oil Operator | Mar 1984 | |
| 12 | Dorothy F. Hamlin | Oil Operator | Dec 1985 | |
| 13 | Dorothy Oil Company | Oil & Gas Operator | Oct 1994 |