Oil & Gas Companies in Niobrara County, WY
| Company Name | Company Location | Company Type | Most Recent Production |
|---|
| 1 | Earthstone Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2017 |
| 2 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 3 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 4 | Ellwood Exploration LLC | San Antonio, TX 78217 | Oil Operator | Feb 2024 |
| 5 | Empire Petroleum Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Dec 2005 |
| 6 | Energas Corporation | Oklahoma City, OK 73105-6422 | Oil & Gas Operator | Jan 2024 |
| 7 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 8 | EOG Y Resources Inc | Artesia, NM 88210 | Oil & Gas Operator | Feb 2019 |
| 9 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 10 | Equitable Resources Energy Company | Big Stone Gap, VA 24219 | Oil & Gas Operator | Dec 1997 |
| 11 | Evergreen Operating Company | Denver, CO 80202 | Oil & Gas Operator | Apr 1996 |
| 12 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jan 2024 |
Production numbers shown above are only for Niobrara County, WY and for the production period listed.