Oil & Gas Companies in Harper County, KS
| Company Name | Company Location | Company Type | Most Recent Production |
| 201 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Nov 2025 |
| 202 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 203 | Twin M, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Sep 2025 |
| 204 | Union Valley Petroleum Corp | Enid, OK 73701 | Oil & Gas Operator | Nov 2025 |
| 205 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |
| 206 | Val Energy, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 207 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 208 | Vincent Oil Corp | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 209 | Wells Energy Com | | Oil & Gas Operator | Mar 1994 |
| 210 | Westlake Energy Consultants, Inc. | Westlake VIllage, CA 91362 | Gas Operator | Dec 2019 |
| 211 | White Pine Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 212 | Wildcat Oil & Gas LLC | Seneca, KS 66538 | Oil & Gas Operator | Sep 2025 |
| 213 | Wood, E. H., Jr. | Wichita, KS 67202 | Oil & Gas Operator | Sep 2010 |
| 214 | Woolsey Operating Company, LLC | Wichita, KS 67226 | Oil & Gas Operator | Sep 2025 |
| 215 | Woolsey Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 216 | Worsham Petroleum | Denver, CO 80209 | Gas Operator | Aug 2001 |
Production numbers shown above are only for Harper County, KS and for the production period listed.