Oil & Gas Companies in Caldwell County, TX
| Company Name | Company Location | Company Type | Most Recent Production |
| 1 | R & S Energy Company | Luling, TX 78648 | Oil & Gas Operator | Dec 2010 |
| 2 | R & S Oil Production Co. | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 3 | R&R Resources Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2015 |
| 4 | R. B. Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 1996 |
| 5 | Ramrod Oil And Gas (U.S.A.) Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2025 |
| 6 | Rayalto Oil & Gas, Inc. | MC Queeney, TX 78123 | Oil & Gas Operator | Mar 2004 |
| 7 | RBR Operating, Inc. | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 8 | Red Shell Inc | Dale, TX 78616 | Oil & Gas Operator | Oct 2025 |
| 9 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 10 | Reliance Oil And Gas, Inc. | Austin, TX 78748 | Oil Operator | Jun 2012 |
| 11 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Oct 2025 |
| 12 | Resource Expl & Prod, Inc. | Salado, TX 76571 | Oil & Gas Operator | Oct 2025 |
| 13 | Ridgeway Exco, Inc. | San Antonio, TX 78279 | Oil & Gas Operator | Mar 1996 |
| 14 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 15 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 16 | Rockland Oil Company | Addison, TX 75001 | Oil & Gas Operator | Jun 2025 |
| 17 | Rodenberg, Laura Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 18 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Oct 2025 |
| 19 | Rollert Co., Inc., The | Luling, TX 78648 | Oil & Gas Operator | Nov 2000 |
| 20 | Rosenthal, Stanley H. | Bay City, TX 77404 | Oil & Gas Operator | Dec 2020 |
| 21 | Royal Texas Petroleum | Lago VIsta, TX 78645 | Oil & Gas Operator | Oct 2025 |
| 22 | Ruth Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Feb 2010 |
Production numbers shown above are only for Caldwell County, TX and for the production period listed.