Oil & Gas Companies in Hartley County, TX
| Company Name | Company Location | Company Type | Most Recent Production |
| 1 | M E G G , Inc. | Borger, TX 79008 | Oil & Gas Operator | Sep 2003 |
| 2 | Makoil, Inc. | Lake Forest, CA 92630 | Oil & Gas Operator | Jul 2007 |
| 3 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 4 | McKinney Operating Company | Canadian, TX 79014 | Gas Operator | May 2002 |
| 5 | Mesa Operating Co. | Irving, TX 75039 | Oil & Gas Operator | Aug 1997 |
| 6 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 7 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2025 |
| 8 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 9 | Midwestern Exploration Co. | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 10 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 11 | Mitchell Ehrlich Oil & Gas, LLC | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 12 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 13 | MRR Oil Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2002 |
Production numbers shown above are only for Hartley County, TX and for the production period listed.