Oil & Gas Companies in Elk County, KS
| Company Name | Company Location | Company Type | Most Recent Production |
| 1 | C & C Oil | | Oil & Gas Operator | Jan 2004 |
| 2 | C & E Oil, LLC | Grenola, KS 67346 | Oil Operator | Nov 2021 |
| 3 | Cannon Oil Co. | | Oil Operator | Dec 2009 |
| 4 | Carlin Oil & Gas | | Oil Operator | Jan 1994 |
| 5 | Carter, Eugene J. | Longton, KS 67352 | Oil Operator | Jan 1998 |
| 6 | Cherokee Wells LLC | Fredonia, KS 66736 | Oil & Gas Operator | Jun 2025 |
| 7 | Cleaver Loraine | | Oil Operator | Dec 1996 |
| 8 | Cody, Ken L. | Longton, KS 67352 | Oil & Gas Operator | Jun 2025 |
| 9 | Cody, Nancy M. | Fredonia, KS 66736 | Oil Operator | Jun 1998 |
| 10 | Colonial Corporation | St Simons Island, GA 31522 | Oil & Gas Operator | Dec 2000 |
| 11 | Conner, Rick | Winfield, KS 67156 | Oil Operator | Aug 2019 |
| 12 | Coronado Kansas, LLC | Tulsa, OK 74133 | Oil Operator | Oct 2009 |
| 13 | Criger Oil Compa | | Oil Operator | Sep 1992 |
| 14 | Criteria Petrole | | Oil Operator | Sep 1996 |
| 15 | CTR 247 LLC | Peru, KS 67360 | Oil Operator | Jun 2025 |
Production numbers shown above are only for Elk County, KS and for the production period listed.