| Willamar West Unit O-4-3391 | Citation Oil & Gas Corp. only | Willamar, West | Willacy | 207 | 3.02M | 3.17M | Jan 1993 – Jul 2026 |
| Willamar East Unit O-4-7915 | Citation Oil & Gas Corp. only | Willamar | Willacy | 28 | 2.12M | 1.88M | Jan 1993 – Jul 2026 |
| Sauz Ranch Mulatos Pasture O-4-3390 | Chestnut Explor. and Prod., Inc. only | Willamar, West | Willacy | 31 | 783K | 299K | Jan 1993 – Jul 2026 |
| Sauz Ranch Mulatos Pasture O-4-3366 | Chestnut Explor. and Prod., Inc. only | Willamar | Willacy | 23 | 524K | 310K | Jan 1993 – Jul 2026 |
| Yturria Cattle Co. (22 Sd.) O-4-11611 | Texas Oil and Gas Operating, LLC only | La Sara (No. 22 Sd.) | Willacy | 3 | 503K | 13.4K | Jan 1993 – Jul 2026 |
| Willamar West Miocene Unit O-4-9525 | Citation Oil & Gas Corp. only | Willamar, West (Miocene 5300) | Willacy | 8 | 475K | 663K | Jan 1993 – Jul 2026 |
| Willamar Community "E" O-4-12714 | Citation Oil & Gas Corp. only | Willamar (Miocene 5400, East) | Willacy | 3 | 463K | 314K | Jun 1997 – Jul 2026 |
| Yturria, H. O-4-13071 | Apollo Petro Fuels LLC only | Raymondville (Consolidated) | Willacy | 3 | 445K | 919K | Feb 2002 – Jul 2026 |
| Bell, S.H. O-4-13096 | Citation Oil & Gas Corp. only | Willamar (Miocene 5400, East) | Willacy | 2 | 402K | 182K | Aug 2002 – Feb 2020 |
| Willamar Community "E" O-4-12275 | Citation Oil & Gas Corp. only | Willamar (Miocene 5300, East) | Willacy | 2 | 350K | 318K | Sep 1993 – Jul 2026 |
| Williamar West Miocene Unit O-4-10056 | Citation Oil & Gas Corp. only | Willamar, West (Miocene 5850) | Willacy | 5 | 271K | 172K | Jan 1993 – Jul 2026 |
| Cavazos, Nicholas O-4-3369 | Citation Oil & Gas Corp. only | Willamar | Willacy | 3 | 243K | 142K | Jan 1993 – Jul 2026 |
| Sauz Ranch Mulatos Pasture O-4-3387 | Shoco Production LLC only | Willamar (Graben North) | Willacy | 3 | 236K | 166K | Jan 1993 – Jul 2026 |
| Willamar West Miocene Unit O-4-10055 | Citation Oil & Gas Corp. only | Willamar, W.(miocene 6400) | Willacy | 7 | 229K | 262K | Jan 1993 – Jul 2026 |
| Willamar Community O-4-9630 | Citation Oil & Gas Corp. only | Willamar (Graben 5090) | Willacy | 1 | 227K | 145K | Jan 1993 – Jul 2026 |
| Sauz Ranch Mulatos Pasture O-4-4287 | Chestnut Explor. and Prod., Inc. only | Willamar (Graben a-1 Sd., N.) | Willacy | 7 | 170K | 39.8K | Jan 1993 – Jul 2026 |
| Sauz Ranch Mulatos Pasture O-4-4289 | Shoco Production LLC only | Willamar (Graben C-1 Sand, N.) | Willacy | 3 | 153K | 26.6K | Jan 1993 – Jul 2026 |
| Thomas Oil Unit O-4-13963 | Dewbre Petroleum Corporation only | Riggan (F-8) | Willacy | 1 | 139K | 77.3K | Jun 2014 – Jul 2026 |
| Bell, S. H. O-4-12654 | Citation Oil & Gas Corp. only | Willamar (Miocene 5200, East) | Willacy | 1 | 134K | 419K | Dec 1996 – Jul 2026 |
| Willamar West Miocene Unit O-4-13110 | Citation Oil & Gas Corp. only | Willamar West (Miocene 4700) | Willacy | 1 | 104K | 47.7K | Aug 2002 – Jul 2026 |
| Yturria Cattle Co. O-4-12137 | Durango Resources Corp. only | La Sara (No. 10-a Sand) | Willacy | 1 | 97.4K | 16 | Jan 1993 – Jun 2014 |
| Pinnell, H. P. "C" O-4-13143 | Hughes, Dan A. Company, L.P. only | El Sauz Ranch (6970) | Willacy | 1 | 93.4K | 97.6K | Feb 2003 – Jul 2026 |
| Pinnell, H P "C" O-4-13147 | Hughes, Dan A. Company, L.P. only | El Sauz Ranch (6985) | Willacy | 1 | 91.7K | 14.6K | Apr 2003 – Jul 2026 |
| Yturria O-4-13960 | Texas Oil and Gas Operating, LLC only | La Sara (3850) | Willacy | 1 | 86.4K | 0 | Dec 2014 – Jul 2026 |
| Johnson, Elmer, G. Etal O-4-3374 | Citation Oil & Gas Corp. only | Willamar | Willacy | 1 | 83.7K | 192K | Jan 1993 – Jul 2026 |
| Yturria Cattle Co O-4-13076 | Hilcorp Energy Company only | La Sara, NW. (3000) | Willacy | 1 | 75.6K | 71 | Feb 2002 – May 2022 |
| Sauz Ranch Mulatos Pasture O-4-11735 | Chestnut Explor. and Prod., Inc. only | Willamar, West (Miocene 5500, N) | Willacy | 1 | 74.5K | 50.2K | Jan 1993 – Jul 2026 |
| Yturria Cattle Co. O-4-10922 | Durango Resources Corp. only | La Sara (No. 19 Sand) | Willacy | 2 | 70.7K | 16 | Jan 1993 – Mar 2014 |
| Yturria O-4-13559 | Texas Oil and Gas Operating, LLC only | Lacal (E-10) | Willacy | 1 | 70.2K | 34K | Dec 2008 – Jul 2026 |
| Yturria Cattle Co. O-4-11038 | Texas Oil and Gas Operating, LLC only | La Sara (No. 8 Sand) | Willacy | 3 | 69K | 16 | Jan 1993 – Jul 2026 |
| Sauz Ranch Mulatos Pasture O-4-14076 | Shoco Production LLC only | Willamar, West | Willacy | 6 | 61.9K | 0 | May 2018 – Jul 2026 |
| Yturria, Fausto O-4-13294 | Texas Oil and Gas Operating, LLC only | La Sara (6250) | Willacy | 1 | 60.3K | 62.3K | Sep 2004 – Jul 2026 |
| Willamar Community -E- O-4-6429 | Citation Oil & Gas Corp. only | Willamar (6350) | Willacy | 3 | 55.8K | 92.1K | Jan 1993 – Jul 2026 |
| Yturria, H. O-4-13001 | Cody Energy LLC only | Raymondville (F-28) | Willacy | 1 | 54.4K | 101K | Mar 2001 – Jun 2002 |
| Yturria O-4-13864 | Texas Oil and Gas Operating, LLC only | La Sara (4300) | Willacy | 2 | 53.7K | 0 | Apr 2014 – Jul 2026 |
| Yturria Cattle Co. "B" O-4-12464 | Maynard Oil Co. only | La Sara (No. 22 Sd.) | Willacy | 1 | 53K | 61.1K | May 1995 – May 2000 |
| Yuturria Cattle Co. O-4-10944 | Texas Oil and Gas Operating, LLC only | La Sara (No. 14-a Sand) | Willacy | 1 | 48.7K | 16 | Jan 1993 – Jul 2026 |
| Yturria O-4-13344 | Texas Oil and Gas Operating, LLC only | La Sara, NE. (7590) | Willacy | 2 | 48.2K | 17.6K | Apr 2005 – Jul 2026 |
| Yturria Cattle Company O-4-14171 | Texas Oil and Gas Operating, LLC only | La Sara (No. 21 Sand) | Willacy | 1 | 47.1K | 0 | Nov 2021 – Jul 2026 |
| Sauz Ranch Mulatos Pasture O-4-14077 | Shoco Production LLC only | Willamar (Graben a-1 Sd., N.) | Willacy | 1 | 42.5K | 0 | May 2018 – Jul 2026 |
| Yturria, Frank D. et Al O-4-13070 | Cody Energy LLC only | Raymondville (Consolidated) | Willacy | 2 | 29.9K | 196K | Dec 2001 – Nov 2007 |
| Yturria L & C Co. NCT-2 O-4-12528 | Cody Energy LLC only | Raymondville (a- 5) | Willacy | 1 | 28.7K | 11.7K | Nov 1995 – Mar 2002 |
| Sauz Ranch Mulatos Pasture O-4-12283 | Chestnut Explor. and Prod., Inc. only | Willamar, West (Miocene 5850) | Willacy | 2 | 27.7K | 23.3K | Nov 1993 – Jul 2026 |
| Yturria O-4-14167 | Texas Oil and Gas Operating, LLC only | La Sara (No. 21 Sand) | Willacy | 1 | 27.2K | 0 | Nov 2021 – Jul 2026 |
| Sauz Ranch Mulatos Pasture O-4-12349 | Flint Oak Energy, LLC only | Willamar, West (Miocene 6100) | Willacy | 2 | 26.6K | 44.5K | Apr 1994 – Aug 2013 |
| Geis Harvey O-4-13142 | Proline Energy Resources Inc only | La Sal Vieja | Willacy | 1 | 26.6K | 193K | Feb 2003 – Jul 2026 |
| Sauz Ranch Mulatos Pasture O-4-13770 | Chestnut Explor. and Prod., Inc. only | Willamar, West (Miocene 5100) | Willacy | 3 | 25.1K | 28.5K | Jul 2012 – Jul 2026 |
| Yturria O-4-13954 | Texas Oil and Gas Operating, LLC only | La Sara (No. 40 Sand) | Willacy | 2 | 23.7K | 0 | Apr 2014 – Jul 2026 |
| Willamar West Miocene Unit O-4-11548 | Citation Oil & Gas Corp. only | Willamar, West (Miocene 5100) | Willacy | 4 | 21.6K | 73.5K | Jan 1993 – Dec 2012 |
| Yturria Cattle Co. O-4-12525 | Maynard Oil Co. only | La Sara (No. 17 Sand) | Willacy | 1 | 21.5K | 64.4K | Feb 1996 – Apr 2001 |