Oil & Gas Companies in Big Horn County, WY
| Company Name | Company Location | Company Type | Most Recent Production |
| 1 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 2 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 3 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 4 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 5 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 6 | Three G Inc | Cody, WY 82414 | Oil & Gas Operator | Dec 1999 |
| 7 | Tindall Operating Company | Englewood, CO 80112 | Oil & Gas Operator | Jan 2025 |
| 8 | Tribar Resources LLC | | Oil Operator | Aug 2025 |
| 9 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 10 | Trout Kye Jr | | Oil & Gas Operator | Dec 2010 |
| 11 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Aug 2025 |
| 12 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 13 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Aug 2025 |
Production numbers shown above are only for Big Horn County, WY and for the production period listed.