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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Conocophillips Alaska, Inc. | Alaska | 4,159,611 BBLs | 11,613,035 MCF | Dec 1963 - Feb 2026 |
| Conocophillips Company | New Mexico | 922,532 BBLs | 3,310,954 MCF | Jan 2003 - Jan 2026 |
| Contango Resources LLC | Wyoming | 383,718 BBLs | 10,398,705 MCF | Feb 2020 - Jan 2026 |
| Contango Resources, Inc. | Montana | 18,396 BBLs | 92,719 MCF | Dec 2020 - Feb 2026 |
| Continental Resources Inc | Montana | 192,166 BBLs | 330,165 MCF | Jan 1991 - Jan 2026 |
| Continental Resources Inc | Wyoming | 1,196,534 BBLs | 3,154,029 MCF | Jan 1993 - Jan 2026 |
| Continental Resources, Inc. | North Dakota | 4,645,073 BBLs | 18,427,178 MCF | Sep 1978 - Feb 2026 |
| Cook Inlet Energy, LLC. | Alaska | 89,464 BBLs | 42,179 MCF | Dec 2009 - Feb 2026 |
| Coral Production Corporation | Kansas | 2,153 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| Core Antrim Company LLC | Michigan | 0 BBLs | 65,995 MCF | Jul 2025 - Aug 2025 |
| Core Energy LLC | Michigan | 29,510 BBLs | 8,671 MCF | Jan 2006 - Aug 2025 |
| Cornerstone Natural Resources LLC | North Dakota | 6,407 BBLs | 7,216 MCF | Jan 2007 - Feb 2026 |
| Coteau Energy LLC | Louisiana | 11,100 BBLs | 72,787 MCF | Aug 2021 - Dec 2024 |
| Coterra Energy Operating Co. | New Mexico | 3,633,558 BBLs | 13,110,635 MCF | Oct 2002 - Jan 2026 |
| Crawford Production Company | Kansas | 1,388 BBLs | 721 MCF | Jan 1980 - Dec 2025 |
| Creole Operating, LLC | Louisiana | 1,922 BBLs | 11,244 MCF | May 2020 - Dec 2024 |
| Crescent Energy Operating, LLC | Utah | 498,358 BBLs | 2,318,331 MCF | Sep 2025 - Jan 2026 |
| Crescent Pass Energy, LLC | Louisiana | 100 BBLs | 90,211 MCF | Aug 2018 - Jan 2025 |
| Crestone Peak Resources Operating LLC | Colorado | 1,162,657 BBLs | 6,266,589 MCF | Jan 1999 - Jan 2026 |
| Crosbys Creek Oil & Gas, LLC | Alabama | 5,140 BBLs | 39,480 MCF | Apr 1982 - Jan 2026 |
| Cross Bar Energy, LLC | Kansas | 2,292 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| Cross Timbers Energy, LLC | New Mexico | 23,626 BBLs | 352,150 MCF | Jul 2013 - Jan 2026 |
| Crown Energy Company | Kansas | 2,451 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| Curt'S Oil Operation, LLC | Kansas | 4,082 BBLs | 1,711 MCF | Jan 2010 - Dec 2025 |
| Dakota Crude, Inc. | North Dakota | 1,128 BBLs | 0 MCF | May 2003 - Feb 2026 |
| Dakota Resources, Inc | New Mexico | 952 BBLs | 1,437 MCF | Jan 1993 - Jan 2026 |
| Dale E. Jackson Production Co. | Kansas | 1,959 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| Darrah Oil Company, LLC | Kansas | 15,318 BBLs | 6,688 MCF | Jan 2010 - Dec 2025 |
| Daube Company The | Wyoming | 7,468 BBLs | 450 MCF | Jan 1990 - Feb 2026 |
| Daylight Petroleum LLC | Louisiana | 6,709 BBLs | 21,077 MCF | Feb 2019 - Dec 2024 |
| Daystar Petroleum, Inc. | Kansas | 10,938 BBLs | 13,476 MCF | Jan 1980 - Dec 2025 |
| DBD Oil, LLC | Kansas | 1,126 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| De Soto Oil Properties, LLC | Alabama | 2,056 BBLs | 1,624 MCF | May 1988 - Jan 2026 |
| Delta Royalties LLC | Louisiana | 2,739 BBLs | 7,275 MCF | Nov 2019 - Dec 2024 |
| Denbury Onshore, LLC | Alabama | 18,694 BBLs | 0 MCF | Jan 1956 - Jan 2026 |
| Denbury Onshore, LLC | Louisiana | 76,063 BBLs | 69,845 MCF | Jan 2004 - Dec 2024 |
| Denbury Onshore, LLC | Montana | 85,101 BBLs | 0 MCF | Jan 2011 - Jan 2026 |
| Denbury Onshore, LLC | North Dakota | 96,730 BBLs | 22,522 MCF | Oct 2007 - Feb 2026 |
| Desert Eagle Operating LLC | Colorado | 0 BBLs | 47,063 MCF | Apr 2022 - Jan 2026 |
| Deutsch Oil Company | Kansas | 2,457 BBLs | 516 MCF | Jan 1980 - Dec 2025 |
| Devon Energy Production Company LP | Wyoming | 658,968 BBLs | 1,221,834 MCF | Jan 1978 - Jan 2026 |
| Devon Energy Production Company, LP | New Mexico | 6,065,515 BBLs | 31,195,320 MCF | Jan 1993 - Jan 2026 |
| Devon Energy Williston, L.L.C | North Dakota | 2,507,643 BBLs | 11,499,911 MCF | Sep 2025 - Feb 2026 |
| Devon Energy Williston, L.L.C. | Montana | 94,855 BBLs | 104,922 MCF | Apr 2021 - Jan 2026 |
| DGH Oil, LLC | Kansas | 4,869 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| DHP Investments, LTD. | Kansas | 1,170 BBLs | 0 MCF | Mar 2008 - Dec 2025 |
| Diehl Oil Inc | Kansas | 1,952 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| Diversified Production LLC | Louisiana | 8,836 BBLs | 3,242,940 MCF | May 2021 - Dec 2024 |
| Dixon Operating Company, LLC | Kansas | 10,637 BBLs | 47,131 MCF | Jan 2010 - Dec 2025 |
| DJR Operating, LLC | New Mexico | 363,594 BBLs | 1,106,479 MCF | Nov 2017 - Jan 2026 |