| WLP O-2-8579 | Lake Pasture (H-434) | Refugio | 105 | 9.17M | 115M | Jan 2001 – Jul 2026 |
| T-C Oil Co.- O'Connor O-2-2554 | Lake Pasture (H-440 Sand) | Refugio | 114 | 6.52M | 31.4M | Jan 1993 – Jul 2026 |
| Oconnor, Dennis, Etal -L- O-2-2845 | Lake Pasture (H-440 Sand) | Refugio | 81 | 3.49M | 48.5M | Jan 1993 – Jul 2026 |
| River Ranch -a-/Williams State U O-2-9301 | Anaqua (3100) | Refugio | 12 | 1.99M | 509K | Sep 2008 – Jul 2026 |
| Oconnor -D- O-2-2834 | Lake Pasture (H-440 Sand) | Refugio | 25 | 1.32M | 5.82M | Jan 1993 – Jul 2026 |
| O'Connor -H- O-2-9321 | Anaqua (3100) | Refugio | 7 | 987K | 280K | May 2009 – Jul 2026 |
| River Ranch -B- State Unit O-2-9357 | Anaqua (3100) | Refugio | 6 | 701K | 104K | Nov 2009 – Jul 2026 |
| O'Connor O-2-8367 | Huff (4400) | Refugio | 19 | 693K | 597K | Jan 1998 – Jul 2026 |
| Clay Pasture -B- State Unit O-2-9381 | Anaqua, South (3000) | Refugio | 3 | 539K | 104K | Dec 2009 – Jul 2026 |
| O'Connor O-2-7505 | Huff (5000) | Refugio | 8 | 366K | 452K | Jan 1993 – Jul 2026 |
| O'Connor, M. E. O-2-5130 | Woodsboro, South (4200) | Refugio | 23 | 360K | 134K | Jan 1993 – Jul 2026 |
| O'Connor O-2-11800 | McFaddin (4400) | Refugio | 15 | 354K | 164K | Jul 2019 – Jul 2026 |
| Oconnor, Dennis, et al -N- O-2-3598 | Huff (372) | Refugio | 7 | 314K | 481K | Jan 1993 – Jul 2026 |
| Clay Pasture -B- State Unit O-2-9332 | Anaqua (3100) | Refugio | 3 | 207K | 76.4K | Jul 2009 – Jul 2026 |
| Braman -D- O-2-11520 | Braman (8200) | Refugio | 1 | 206K | 293K | Mar 2018 – Jul 2026 |
| O'Connor, Dennis et al -N- O-2-8738 | Huff (3000, FB-W) | Refugio | 1 | 205K | 133K | Sep 2002 – Jul 2026 |
| O'Connor, Dennis et al -A- O-2-8133 | Melon Ranch (5800) | Refugio | 1 | 157K | 201K | Dec 1995 – Jul 2026 |
| Oconner, M. E. O-2-6867 | Refugio Old (5500) | Refugio | 1 | 155K | 204K | Jan 1993 – Jul 2026 |
| Oconnor -H- O-2-2571 | Huff (372) | Refugio | 5 | 141K | 445K | Jan 1993 – Jul 2026 |
| O'Conner -D- O-2-5957 | Lake Pasture (H-434) | Refugio | 12 | 134K | 799K | Jan 1993 – Jul 2026 |
| O'Connor, Dennis et al -N- O-2-8931 | Huff (2950 Sand) | Refugio | 1 | 122K | 128K | Nov 2004 – Jul 2026 |
| Oconnor, Thomas -E- O-2-1526 | Tom Oconnor | Refugio | 29 | 116K | 317K | Jan 1993 – Jul 2026 |
| Meoc-Mellon-State Unit O-2-11756 | Mary Ellen Oconnor (8200) | Refugio | 1 | 112K | 351K | Jun 2019 – Jul 2026 |
| O'Connor-H-Clay Past-State Unit O-2-11509 | Anaqua (5300) | Refugio | 1 | 68.9K | 198K | Apr 2018 – Jul 2026 |
| Clay Pasture -E- State Unit O-2-12305 | McFaddin (3900) | Refugio | 1 | 58.5K | 86.7K | Dec 2021 – Jul 2026 |
| O'Connor -H- O-2-12315 | Anaqua, South (3000) | Refugio | 1 | 56.5K | 14K | Jan 2022 – Jul 2026 |
| Clay Pasture -B- State Unit O-2-10101 | Anaqua (3000) | Refugio | 1 | 56.2K | 17.6K | Jan 2012 – Jul 2026 |
| Anderson, Mary Alice et al 'A' O-2-12275 | Fagan (Greta Sand) | Refugio | 1 | 56.1K | 169K | Dec 2021 – Jul 2026 |
| Oconnor O-2-1503 | T-C (5600) | Refugio | 19 | 52K | 203K | Jan 1993 – Jul 2026 |
| Oconnor, Thomas -B- O-2-3660 | Tom Oconnor (5400 Sand) | Refugio | 10 | 43K | 133K | Jan 1993 – Jul 2026 |
| Braman -A- O-2-12766 | Braman (8200) | Refugio | 1 | 32.6K | 314K | Apr 2024 – Jul 2026 |
| O'Connor O-2-7649 | Huff (5250) | Refugio | 3 | 31.8K | 139K | Jan 1993 – Jul 2026 |
| Duke Ranch -18- O-2-12984 | Tejas (Frio 5400) | Goliad | 1 | 21.6K | 3.41K | Jun 2025 – Jul 2026 |
| Clay Pasture -E- State Unit O-2-12263 | Anaqua (4100) | Refugio | 1 | 17.4K | 15K | Aug 2021 – Jul 2026 |
| Oconnor, Thomas, -A- O-2-2864 | Tom Oconnor (5900 Sand) | Refugio | 3 | 12.5K | 47.9K | Jan 1993 – Jul 2026 |
| O'Connor, Thomas -E- O-2-9068 | Tom Oconnor (5675 Sand) | Refugio | 1 | 12.2K | 10.6K | Jul 2006 – Jul 2026 |
| Clay Pasture -B- State Unit O-2-13103 | Anaqua (2960) | Refugio | 1 | 10.5K | 7.6K | May 2025 – Jul 2026 |
| Duke Ranch -16- O-2-12971 | Tejas (Frio 5200) | Goliad | 1 | 9.49K | 30.1K | Apr 2025 – Jul 2026 |
| O'Connor O-2-11928 | McFaddin (5350) | Refugio | 1 | 8.39K | 17.5K | Feb 2020 – Jul 2026 |
| Oconnor, Thomas -E- O-2-3661 | Tom Oconnor (5400 Sand) | Refugio | 13 | 8.27K | 5.96K | Jan 1993 – Jul 2026 |
| O'Connor -H- O-2-13186 | Anaqua (3000) | Refugio | 1 | 7.23K | 2.34K | Dec 2025 – Jul 2026 |
| Nordan & Morris, Oconnor, Thomas O-2-2868 | Tom Oconnor (5900 Sand) | Refugio | 3 | 3.1K | 3.98K | Jan 1993 – Jul 2026 |
| Braman -G- O-2-13182 | Braman (8300) | Refugio | 1 | 1.98K | 18.8K | Dec 2025 – Jul 2026 |
| Mary Alice Anderson et al 'A' O-2-12526 | Fagan (5650) | Refugio | 1 | 1.55K | 11.1K | Feb 2023 – Jul 2026 |
| O'Connor, M. E. O-2-5564 | Woodsboro, South (4200) | Refugio | 2 | 1.46K | 0 | Jan 1993 – Jul 2026 |
| O'Connor -H- O-2-10579 | Huff (3250) | Refugio | 1 | 1.34K | 19.7K | Jul 2013 – Jul 2026 |
| O'Connor, Dennis et al -N- G-2-200149 | Huff (3250) | Refugio | 1 | 0 | 44.4K | Sep 2003 – Jul 2026 |
| T-C Oil Co.-Oconnor G-2-114875 | Lake Pasture (M-330) | Refugio | 1 | 0 | 0 | Jan 1993 – Jul 2026 |
| Dennis O'Connor et al -L- G-2-217977 | Lake Pasture (H-434) | Refugio | 1 | 0 | 626K | Dec 2005 – Jul 2026 |
| O'Connor "H" G-2-149137 | McFaddin (3900) | Refugio | 1 | 0 | 63.5K | Mar 1994 – Jul 2026 |