Oil & Gas Companies in Caldwell County, TX
| Company Name | Company Location | Company Type | Most Recent Production |
| 1 | O.G.O. Refining | Luling, TX 78648 | Oil & Gas Operator | Jun 2013 |
| 2 | Oak Valley Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2015 |
| 3 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 4 | Ogris Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 5 | Oilex Int'L Investments, Inc. | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 6 | Ojb, Inc. | Buda, TX 78610 | Oil & Gas Operator | Mar 2013 |
| 7 | Origin Prod Co Gonzales Prop LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Oct 2025 |
| 8 | Origin Production Company, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Oct 2025 |
| 9 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 10 | Osyka Oil & Gas, Inc. | Metairie, LA 70004 | Oil & Gas Operator | Oct 2025 |
| 11 | Outline Oil Corp. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 12 | Overly Operating Co. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2013 |
Production numbers shown above are only for Caldwell County, TX and for the production period listed.