Oil & Gas Companies in Niobrara County, WY
| Company Name | Company Location | Company Type | Most Recent Production |
|---|
| 1 | M & K Oil Company LLC | Gillette, WY 82716 | Oil & Gas Operator | Aug 2025 |
| 2 | Manewal Bradley Oil Company | Newcastle, WY 82701 | Oil & Gas Operator | Aug 2013 |
| 3 | Manx Oil Corporation | Casper, WY 82601 | Oil & Gas Operator | Jun 2010 |
| 4 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 5 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 6 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 7 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 8 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 9 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 10 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 11 | Millennium Oil & Gas LLC | Denver, CO 80203 | Oil & Gas Operator | Aug 2025 |
| 12 | Morgan Energy Corporation | Englewood, CO 80110 | Oil & Gas Operator | Mar 2006 |
| 13 | Mosbacher Production Co. | Houston, TX 77001 | Oil & Gas Operator | Aug 1984 |
| 14 | Murphy D V | | Oil Operator | Dec 1989 |
| 15 | Murphy Sheldon L & Loretta | Newcastle, WY 82701 | Oil & Gas Operator | Aug 2025 |
Production numbers shown above are only for Niobrara County, WY and for the production period listed.