Oil & Gas Companies in Montgomery County, KS
| Company Name | Company Location | Company Type | Most Recent Production |
| 1 | L & J Oil Co. | Borger, TX 79007 | Oil & Gas Operator | Apr 1999 |
| 2 | L And J Oil Comp | | Oil Operator | Dec 1996 |
| 3 | Landowner | Honolulu, HI | Oil & Gas Operator | Dec 2008 |
| 4 | Layne Energy Operating, LLC | Kansas City, KS 66106 | Oil & Gas Operator | Feb 2025 |
| 5 | Layton Oil Compa | | Oil & Gas Operator | Jul 1985 |
| 6 | Lee Donna Oil Co | | Oil & Gas Operator | Dec 1996 |
| 7 | Leonard, Daniel M. | Fort Worth, TX 76101 | Oil & Gas Operator | Nov 2001 |
| 8 | Line, Jerry W., SR. | Tulsa, OK 74137 | Oil Operator | Nov 1996 |
| 9 | Lio-1 Corporation | Las Vegas, NV 89116 | Oil Operator | Feb 2025 |
| 10 | Long And Ware Oil, A General Partnership | Pawhuska, OK 74056 | Oil Operator | Jan 2021 |
| 11 | Longhorn Propert | | Oil Operator | Feb 1989 |
| 12 | LR Energy, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2025 |
| 13 | Lyon Oil Company | | Oil Operator | Mar 1985 |
Production numbers shown above are only for Montgomery County, KS and for the production period listed.