Oil & Gas Companies in Mississippi
| Company Name | Company Location | Company Type | Most Recent Production |
|---|
| 1 | O'Brien Resources LLC | Shreveport, LA 71136 | Oil Operator | Nov 2017 |
| 2 | O'Malley Production Co Inc. | | Oil & Gas Operator | Mar 1988 |
| 3 | Odom, Claude | | Oil Operator | Jul 1983 |
| 4 | Odyssey Petroleum Corp. | | Oil & Gas Operator | Jun 2011 |
| 5 | Ogden Oil Co., Inc. | | Oil Operator | May 1981 |
| 6 | Oglesby Oil Company | | Oil & Gas Operator | Nov 2023 |
| 7 | Oglesby Prod & Expl Co Inc | | Oil & Gas Operator | Nov 1987 |
| 8 | Oilfield Services And Supply Co. Inc. | | Oil Operator | Sep 1989 |
| 9 | Oilwell Acquisition Co | | Oil & Gas Operator | Jun 1999 |
| 10 | Orion Energy Partners LP | Denver, CO 80202 | Oil & Gas Operator | Nov 2010 |
| 11 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 12 | Osborn Heirs Co | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 13 | Owco Production Co., Inc. | | Oil Operator | Aug 1997 |
| 14 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 15 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 2025 |
Production numbers shown above are only for Mississippi and for the production period listed.