| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | U-N-I Exploratio | Oil & Gas Operator | Dec 1990 | |
| 2 | Uhls, Jimmie J. | Sedan, KS 67361 | Oil Operator | Sep 2019 |
| 3 | Unionville Explo | Oil Operator | Jul 1984 | |
| 4 | United States Exploration, Inc. | Denver, CO 80802 | Oil & Gas Operator | Jun 2009 |
| 5 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |
| 6 | Unruh, Mark D. | Peru, KS 67360 | Oil Operator | Sep 2011 |
| 7 | Usx Operating Co., Inc. | Barnstall, OK 74002 | Oil & Gas Operator | Apr 2017 |