| 201 | Woodman & Iannitti Oil Company | Great Bend, KS 67530 | Oil & Gas Operator | Jan 2003 |
| 202 | Woods Oil | | Oil Operator | Jul 2024 |
| 203 | Woolsey Operating Company, LLC | Wichita, KS 67226 | Oil & Gas Operator | Jul 2024 |
| 204 | Woolsey Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jul 2024 |
| 205 | Worldwide Energy | | Oil & Gas Operator | May 1989 |
| 206 | Worsham Petroleum | Denver, CO 80209 | Gas Operator | Aug 2001 |
| 207 | Worth Drilling | | Oil Operator | Jun 1993 |
| 208 | Wren Investments | | Oil Operator | Feb 1991 |
| 209 | Wrestler Ronald | | Oil Operator | Dec 1994 |
| 210 | Wrestler, David L., A General Partnership | Humboldt, KS 66748 | Oil Operator | Jul 2024 |
| 211 | Wrestler, Ronald D., A General Partnership | Elsmore, KS 66732 | Oil Operator | Jul 2024 |
| 212 | Wright, Erbe & Oil Assoc.& Tubbs | Thayer, KS 66776 | Oil Operator | Apr 2005 |
| 213 | Wykoma Oil Incor | | Oil & Gas Operator | Jul 1990 |
| 214 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |