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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Union Texas Petroleum | Kansas | 0 BBLs | 0 MCF | Feb 1981 - Oct 1991 |
| Union Valley Pet | Kansas | 0 BBLs | 0 MCF | Jun 1995 - Oct 1995 |
| Union Valley Petroleum Corporation | Kansas | 1,904 BBLs | 13,486 MCF | Jan 1995 - Feb 2026 |
| Unionville Explo | Kansas | 0 BBLs | 0 MCF | Oct 1980 - Jul 1984 |
| Unit Petroleum Company | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Dec 2019 |
| United Cementing | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Nov 1993 |
| United Energy And Exploration, LLC | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Oct 2019 |
| United Energy, Inc. | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Aug 2001 |
| United Meridian | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Dec 1992 |
| United Oil & Gas | Kansas | 0 BBLs | 0 MCF | Jan 1981 - Feb 1988 |
| United Oil Corpo | Kansas | 0 BBLs | 0 MCF | Jan 1984 - Feb 1984 |
| United Petroleum | Kansas | 0 BBLs | 0 MCF | Feb 1980 - Mar 1986 |
| United Petroleum Corporation | Kansas | 0 BBLs | 0 MCF | Jul 1985 - May 1996 |
| United Reserve G | Kansas | 0 BBLs | 0 MCF | May 1981 - Aug 1987 |
| United State Exp | Kansas | 0 BBLs | 0 MCF | Jan 1988 - Feb 1994 |
| United States Explor | Kansas | 0 BBLs | 0 MCF | Nov 1991 - Jan 1995 |
| United States Exploration, Inc. | Kansas | 0 BBLs | 0 MCF | Nov 1980 - Apr 2007 |
| United Western E | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Aug 1982 |
| Universal Resour | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Dec 1996 |
| Universal Resources | Kansas | 0 BBLs | 0 MCF | Oct 1994 - Oct 1994 |
| Universal Resources Corporation | Kansas | 0 BBLs | 0 MCF | Jul 1997 - Aug 1999 |
| Unknown | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Apr 2002 |
| Unrein Oil Co | Kansas | 163 BBLs | 0 MCF | Jan 1980 - Feb 2026 |
| Unruh, Elmer | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Aug 1998 |
| Unruh, Mark D. | Kansas | 0 BBLs | 0 MCF | Mar 1982 - Sep 2011 |
| Upland Resources | Kansas | 0 BBLs | 0 MCF | Jan 1980 - Jul 1983 |
| Upland Resources LLC | Kansas | 0 BBLs | 0 MCF | Jul 2025 - Dec 2025 |
| Upland Resources, Inc. | Kansas | 0 BBLs | 0 MCF | Nov 1984 - Dec 2009 |
| Uranus, Inc. | Kansas | 0 BBLs | 0 MCF | Jul 1983 - Jan 2000 |
| Urban Oil And Gas Group LLC | Kansas | 978 BBLs | 582 MCF | Jan 1980 - Feb 2026 |
| Us Energy Expl. Corp. | Kansas | 174 BBLs | 0 MCF | Oct 2013 - Feb 2026 |
| Us Exploration | Kansas | 0 BBLs | 0 MCF | Oct 2000 - Oct 2003 |
| Us Oil Resources LLC | Kansas | 1,926 BBLs | 0 MCF | Jun 2017 - Feb 2026 |
| Usins Oil Compan | Kansas | 0 BBLs | 0 MCF | Jul 1982 - Jan 1993 |
| Usx Operating Co | Kansas | 0 BBLs | 0 MCF | Jan 1988 - Aug 1995 |
| Usx Operating Co., Inc. | Kansas | 0 BBLs | 0 MCF | Sep 1987 - Apr 2017 |
| Utah Oil LLC | Kansas | 2,116 BBLs | 0 MCF | Jan 1980 - Feb 2026 |
| V & F Oil Compan | Kansas | 0 BBLs | 0 MCF | Jul 1985 - Jan 1987 |
| V & F Oil Company, A General Partnership | Kansas | 312 BBLs | 0 MCF | Jan 1980 - Feb 2026 |
| V & R Oil | Kansas | 966 BBLs | 0 MCF | Jan 1980 - Feb 2026 |
| V W & B Drilling Co. | Kansas | 0 BBLs | 0 MCF | Feb 1986 - Feb 1998 |
| V-Loc Oil Company, LLC | Kansas | 0 BBLs | 0 MCF | Mar 2010 - Dec 2019 |
| V. Francis Weigel Family Partnership LLC | Kansas | 1,788 BBLs | 0 MCF | Jan 1980 - Feb 2026 |
| V. R. Oil Co. | Kansas | 93 BBLs | 0 MCF | Jan 1980 - Feb 2026 |
| Vac Petroleum Co | Kansas | 0 BBLs | 0 MCF | Jul 1981 - Dec 1990 |
| Vail Energy/Enma | Kansas | 0 BBLs | 0 MCF | Oct 1980 - Oct 1987 |
| Val Energy, Inc. | Kansas | 14,121 BBLs | 16,464 MCF | Jan 1980 - Feb 2026 |
| Valentine Energy | Kansas | 0 BBLs | 0 MCF | Mar 1982 - Dec 1984 |
| Valhalla Exploration LLC | Kansas | 0 BBLs | 0 MCF | May 2012 - Sep 2023 |
| Vamco Operations | Kansas | 959 BBLs | 918 MCF | Jan 1980 - Feb 2026 |