| McCollum a Unit O-1-16430 | EOG Resources, Inc. only | Eagleville (Eagle Ford-1) | Gonzales | 22 | 4.4M | 7.77M | Dec 2012 – Aug 2026 |
| McCollum a Unit G-1-298821 | EOG Resources, Inc. only | Eagleville (Eagle Ford-1) | Gonzales | 1 | 185K | 347K | Sep 2015 – Aug 2026 |
| Collums, H. O-13-29127 | Atoka Operating, Inc. only | Dexter, S. (Handy Sd.) | Cooke | 2 | 134K | 213K | Jan 1996 – Oct 2021 |
| McCollum,f. T. & Wiebusch, G. W. O-10-7825 | Zarvona Energy LLC only | Wemac (Wolfcamp) | Andrews | 4 | 97.6K | 67.9K | by Jan 1993 – Aug 2026 |
| Gene A. McCollum-Reynolds O-6-15017 | Rose City Resources, LLC only | Gilmer (Cotton Valley Sands) | Upshur | 1 | 83.8K | 158K | May 2011 – Aug 2026 |
| Winger-Odom O-13-29141 | Atoka Operating, Inc. only | Collums (Oil Creek) | Cooke | 1 | 76.6K | 1.77M | Apr 1996 – May 2007 |
| McCollum - Miles O-10-34623 | Zarvona Energy LLC only | Wemac, SE (Wolfcamp) | Andrews | 1 | 75.8K | 53.3K | Sep 1995 – Aug 2026 |
| McCollum-Hood Unit O-3-21482 | Redbud E & P, Inc. only | Giddings (Austin Chalk-3) | Fayette | 2 | 73.8K | 260K | by Jan 1993 – Oct 2025 |
| Gene A. McCollum-Reynolds O-6-14388 | Forest Oil Corporation only | Gilmer, S. (Bossier Sand) | Upshur | 1 | 73.3K | 237K | Apr 2005 – Apr 2011 |
| McCollum, E. W. -A- O-8-8036 | Braka Operating, L.L.C. only | Perkins (Caddo) | Callahan | 1 | 49.2K | 21 | by Jan 1993 – Aug 2026 |
| McCollum, Gene A. O-6-14282 | Sabine Oil & Gas Corporation only | Gilmer, S. (Bossier Sand) | Upshur | 1 | 39.2K | 86.4K | Oct 2003 – Apr 2011 |
| McCollum, E. W. -B- O-8-749 | Braka Operating, L.L.C. only | Perkins (Caddo) | Callahan | 1 | 36.3K | 21 | by Jan 1993 – Mar 2026 |
| McCollum, Gene A. G-6-154926 | Rose City Resources, LLC only | Gilmer(jurassic) | Upshur | 1 | 33.7K | 2.34M | Mar 1995 – Dec 2020 |
| McCollum, C. W. -C- O-8-748 | Braka Operating, L.L.C. only | Perkins (Caddo) | Callahan | 2 | 32.4K | 108 | by Jan 1993 – May 2026 |
| McCollum, Nell O-8-30092 | Patton, E. N. Oil Company, Inc. only | Taylor County Regular | Taylor | 2 | 30.1K | 12.7K | Feb 2008 – Feb 2025 |
| McCollum, A. W. -A- O-1-8065 | Cheatham Well Service, Inc. only | Dunlap | Caldwell | 17 | 27.1K | 5.44K | by Jan 1993 – Aug 2026 |
| Collum Gas Unit G-6-204802 | Adamas Energy LLC only | Huxley (6100) | Shelby | 1 | 24.4K | 4.19M | Aug 2004 – Aug 2026 |
| McCollum, Gene A. G-6-46422 | Rose City Resources, LLC only | Gilmer(jurassic) | Upshur | 1 | 19.3K | 1.39M | by Jan 1993 – Nov 2015 |
| Collums-Blair Unit O-13-34125 | Atoka Energy LLC only | Dexter, S. (Handy Sd.) | Cooke | 1 | 17.5K | 18.3K | Jun 2022 – Aug 2026 |
| McCollum, Nell O-8-29977 | Patton, E. N. Oil Company, Inc. only | Fisher's Rainbow (Flippen Lime) | Taylor | 2 | 16.4K | 4.76K | Jun 2007 – Nov 2009 |
| Collum O-13-21058 | Jones, L. E. Operating, Inc. only | Jud,(foster Sand) | Grayson | 1 | 15.4K | 21.6K | by Jan 1993 – Sep 2024 |
| McCollum, Gene A. G-6-197938 | Rose City Resources, LLC only | Gilmer(jurassic) | Upshur | 1 | 15.1K | 1.43M | Sep 2003 – Jan 2024 |
| R. Collum Jr O-1-17314 | Peach Creek Operating Co, LLC only | Peach Creek (Austin Chalk) | Gonzales | 1 | 14.6K | 23K | Aug 2013 – Jul 2026 |
| McCollum-Belota Unit O-3-21300 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Fayette | 1 | 14.2K | 109K | by Jan 1993 – Apr 1994 |
| McCollum, Gene A. G-6-199396 | Rose City Resources, LLC only | Gilmer(jurassic) | Upshur | 1 | 13.1K | 1.54M | Feb 2004 – May 2020 |
| McCollum O-8-18580 | Borderline Operating Corp. only | Noodle, NW. (Canyon Sd. 4000) | Jones | 3 | 9.25K | 83.5K | by Jan 1993 – Feb 2006 |
| McCollum, Gene A. G-6-196055 | Rose City Resources, LLC only | Gilmer(jurassic) | Upshur | 1 | 9.1K | 958K | Jul 2003 – Mar 2016 |
| Collums, H. H. O-13-17127 | Staub, Larry, Inc. only | Sandusky, West (5650 Sand) | Grayson | 1 | 8.85K | 223 | by Jan 1993 – Apr 2026 |
| McCollum O-8-30238 | US. Fuels, Inc. only | Callahan County Regular | Callahan | 2 | 6.02K | 23.8K | Dec 2008 – Aug 2017 |
| Collum Gas Unit G-6-208983 | Adamas Energy LLC only | Huxley (6100) | Shelby | 1 | 5.22K | 801K | Jan 2005 – Aug 2026 |
| McCollum, Gene A. G-6-217959 | Rose City Resources, LLC only | Gilmer(jurassic) | Upshur | 1 | 5.14K | 661K | Jan 2006 – Aug 2019 |
| E. L. McCollum Gas Unit G-2-258701 | Valence Operating Company only | Helen Gohlke, SW. (Wilcox Cons.) | Victoria | 1 | 4.96K | 378K | Sep 2010 – Aug 2026 |
| McCollum, A.W. -A- O-1-8036 | Tejones Operating Corporation only | Dunlap | Caldwell | 2 | 3.69K | 830 | by Jan 1993 – Oct 2006 |
| McCollum, A.W. -B- O-1-8364 | Tejones Operating Corporation only | Dunlap | Caldwell | 2 | 2.25K | 510 | by Jan 1993 – Dec 2006 |
| McCollum, Gene A. G-6-283416 | Rose City Resources, LLC only | Gilmer (Cotton Valley Sands) | Upshur | 1 | 1.94K | 188K | Aug 2017 – Jul 2026 |
| McCollum,f. T. & Wiebusch, G. W. O-10-58006 | Zarvona Energy LLC only | Spraberry (Trend Area) | Andrews | 1 | 1.38K | 0 | Oct 2021 – Dec 2023 |
| McCollum, A. W. "C" O-1-8307 | Tejones Operating Corporation only | Dunlap | Caldwell | 2 | 1.16K | 484 | by Jan 1993 – Mar 2004 |
| McCollum, Allen W. et UX O-1-5315 | Tejones Operating Corporation only | Luling, West (Austin-Buda) | Caldwell | 1 | 955 | 39 | by Jan 1993 – Nov 1996 |
| Janis-McCollum Unit O-3-14502 | General Oil Company, Inc. only | Giddings (Austin Chalk-3) | Fayette | 1 | 793 | 169 | by Jan 1993 – Nov 1994 |
| Collums O-13-28898 | Heape Exploration, Inc. only | Izod (Oil Creek) | Cooke | 2 | 676 | 3 | May 1994 – Oct 1994 |
| McCollum, A. W. "D" O-1-8308 | Tejones Operating Corporation only | Dunlap | Caldwell | 1 | 632 | 446 | by Jan 1993 – Nov 2003 |
| McCollum-Hood Unit G-3-301199 | Redbud E & P, Inc. only | Giddings (Austin Chalk-3) | Fayette | 1 | 583 | 1.88K | Dec 2025 – Aug 2026 |
| E. L. McCollum et al Unit G-2-68157 | Valence Operating Company only | Helen Gohlke (Wilcox, Lo.) | Victoria | 1 | 290 | 814K | by Jan 1993 – Aug 2026 |
| E. L. McCollum Gas Unit G-2-248220 | Valence Operating Company only | Helen Gohlke (Wilcox, Lo.) | Victoria | 1 | 253 | 157K | Nov 2008 – Aug 2026 |
| McCollum, Gene A. O-6-15018 | Rose City Resources, LLC only | Gilmer (Cotton Valley Sands) | Upshur | 1 | 20 | 4 | Jul 2011 – Apr 2015 |
| Smith, C. Collum G-5-101207 | Mitchell Energy Corporation only | Bald Prairie (CV-Lime) | Robertson | 1 | 0 | 284K | by Jan 1993 – Sep 1999 |
| McCollum, C.W. -C- O-8-12724 | Rominger, R.L. only | Callahan County Regular | Callahan | 1 | 0 | 0 | — |
| McCollum O-8-22127 | Mehaffey Investments, Inc. only | Kaizer (Caddo) | Eastland | 2 | 0 | 0 | — |
| McCollum O-8-29923 | Pace Operating only | Inkum, SE. (Cisco Reef) | Taylor | 1 | 0 | 0 | — |
| McCollum, Nell O-8-29976 | Patton, E. N. Oil Company, Inc. only | Fisher's Rainbow (Flippen Lime) | Taylor | 1 | 0 | 0 | — |