| 601 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 602 | Wes-Mor Drilling, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 603 | Wes-Tex Drilling Company | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 604 | West Inland Energy, Inc. | Aledo, TX 76008 | Oil & Gas Operator | May 2024 |
| 605 | West,Gordon T.Jr. & Rugeley,Stan | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2019 |
| 606 | Western Reserves Corporation | Abilene, TX 79608 | Oil & Gas Operator | Jan 2008 |
| 607 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 608 | Westwood Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2013 |
| 609 | Wheat, Buck Resources, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2009 |
| 610 | White, Jack Operating | Breckenridge, TX 76424 | Oil & Gas Operator | May 2024 |
| 611 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 612 | Whitt Oil & Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | May 2024 |
| 613 | Whitt, W. J. | Albany, TX 76430 | Oil & Gas Operator | Nov 1996 |
| 614 | Wilbanks, Bruce A. | Midland, TX 79701 | Oil & Gas Operator | Aug 1996 |
| 615 | Wilbrook Exploration, Inc. | Lingleville, TX 76461 | Oil & Gas Operator | Aug 2003 |
| 616 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 617 | Wilson, Jerry L. | Ranger, TX 76470 | Oil & Gas Operator | May 2024 |
| 618 | Wimberley Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2013 |
| 619 | Winchester Exploration, Inc. | Arlington, TX 76013 | Oil & Gas Operator | Aug 2003 |
| 620 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2024 |
| 621 | Winn Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 622 | Wylie, Fred, Jr. | Moran, TX 76464 | Oil & Gas Operator | Oct 2022 |
| 623 | Yeates Development Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | May 2024 |
| 624 | Yeates, F. L. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 1997 |
| 625 | Yellow Rose Oil & Gas Oper. Inc. | Cisco, TX 76437 | Oil & Gas Operator | May 2024 |
| 626 | Yellow Rose Oil & Gas Operating | Cisco, TX 76437 | Oil & Gas Operator | Jan 1996 |
| 627 | Young, L. M. | Brownwood, TX 76804 | Oil & Gas Operator | Aug 2003 |
| 628 | Zagava, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | May 2024 |
| 629 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |