| Property Name | Property Location | Property Type | Most Recent Production | |
|---|---|---|---|---|
| 501 | UNDERWOOD, CHARLES G | Doddridge County, WV | Gas Property | Dec 2021 |
| 502 | UNDERWOOD, RALPH | Tyler County, WV | Gas Property | Dec 2021 |
| 503 | UNDERWOOD, RAYMOND | Tyler County, WV | Oil & Gas Property | Dec 2021 |
| 504 | UNDERWOOD, RICHARD M | Wetzel County, WV | Oil & Gas Property | Dec 2021 |
| 505 | UNDERWOOD-BREEN | Denton County, TX | Oil & Gas Property | Apr 2026 |
| 506 | UNDERWOOD-JOHNSON 1 | Hutchinson County, TX | Oil & Gas Property | Apr 2026 |
| 507 | UNDHJEM 1 | Burke County, ND | Oil & Gas Property | May 2026 |
| 508 | UNDINE | Andrews County, TX | Oil & Gas Property | Apr 2026 |
| 509 | UNEY 24-1 | Stanton County, KS | Oil & Gas Property | May 2005 |
| 510 | UNFORGIVEN 34 113-114 | Ward County, TX | Oil & Gas Property | Apr 2026 |
| 511 | UNGER | Armstrong County, PA | Gas Property | Dec 2025 |
| 512 | UNGER | Monroe County, OH | Oil & Gas Property | Dec 2025 |
| 513 | UNGER | Decatur County, KS | Oil Property | Aug 1988 |
| 514 | UNGER | Yuma County, CO | Gas Property | Apr 2026 |
| 515 | UNGER | Decatur County, KS | Oil Property | Mar 1995 |
| 516 | UNGER | Yuma County, CO | Gas Property | Apr 2026 |
| 517 | UNGER | Tuscarawas County, OH | Oil & Gas Property | Dec 2025 |
| 518 | UNGLES | Haskell County, KS | Oil & Gas Property | Mar 2026 |
| 519 | UNGLES | Haskell County, KS | Oil & Gas Property | Mar 2026 |
| 520 | UNGLES | Haskell County, KS | Gas Property | Mar 2026 |
| 521 | UNGUREAN | Coshocton County, OH | Oil & Gas Property | Dec 2025 |
| 522 | UNI-UPR | Weld County, CO | Oil & Gas Property | Jun 2020 |
| 523 | UNICORN | Johnson County, TX | Gas Property | Apr 2026 |
| 524 | UNICORN UNIT | Borden County, TX | Oil & Gas Property | Mar 2026 |
| 525 | UNIMIN UNIT | Somervell County, TX | Oil & Gas Property | Apr 2026 |
| 526 | UNION | Kern County, CA | Oil & Gas Property | Jun 2024 |
| 527 | UNION | Union Parish, LA | Gas Property | Dec 2024 |
| 528 | UNION | Hodgeman County, KS | Oil Property | Mar 2025 |
| 529 | UNION | Garfield County, CO | Oil & Gas Property | Apr 2026 |
| 530 | UNION | Union Parish, LA | Gas Property | Dec 2000 |
| 531 | UNION | Orange County, CA | Oil & Gas Property | May 2026 |
| 532 | UNION | Fremont County, WY | Oil & Gas Property | Oct 2017 |
| 533 | UNION | Andrews County, TX | Oil & Gas Property | Apr 2026 |
| 534 | UNION | Chaves County, NM | Oil Property | Feb 2007 |
| 535 | UNION 33 FEDERAL | Chaves County, NM | Gas Property | Jul 2024 |
| 536 | UNION 35 FEDERAL | Eddy County, NM | Oil & Gas Property | May 2026 |
| 537 | UNION ANNEX | Santa Barbara County, CA | Oil & Gas Property | Mar 1986 |
| 538 | UNION BANK | Kern County, CA | Oil & Gas Property | Apr 2026 |
| 539 | UNION CAMP | Tuscarawas County, OH | Oil & Gas Property | Dec 2025 |
| 540 | UNION CARB | Noble County, OH | Oil & Gas Property | Dec 2025 |
| 541 | UNION CARBIDE | Kanawha County, WV | Oil & Gas Property | Dec 2021 |
| 542 | UNION CARBIDE CORP | Washington County, OH | Oil & Gas Property | Dec 1986 |
| 543 | UNION CENT | Nueces County, TX | Oil & Gas Property | Apr 2026 |
| 544 | UNION CENTRAL | Wilson County, KS | Oil & Gas Property | Sep 2024 |
| 545 | UNION CENTRAL | Denton County, TX | Oil & Gas Property | Apr 2026 |
| 546 | UNION CENTRAL LIFE INS | Nueces County, TX | Gas Property | Apr 2026 |
| 547 | UNION CENTRAL-CONDEE WELCH (SA) 1H | Denton County, TX | Oil & Gas Property | Apr 2026 |
| 548 | UNION CITY | Canadian County, OK | Oil & Gas Property | Mar 2026 |
| 549 | UNION DARBONNE | Ouachita Parish, LA | Gas Property | Nov 2024 |
| 550 | UNION GOVT | Grand County, UT | Oil & Gas Property | May 2026 |
| 551 | UNION HILL | Washington County, TX | Oil & Gas Property | Apr 2026 |
| 552 | UNION KING FEE | Kern County, CA | Oil & Gas Property | Sep 1986 |
| 553 | UNION LAND CO | Harrison County, WV | Oil & Gas Property | Dec 2021 |
| 554 | UNION PACIFIC | Rio Blanco County, CO | Oil & Gas Property | Mar 2026 |
| 555 | UNION PACIFIC | Sweetwater County, WY | Oil & Gas Property | Apr 2009 |
| 556 | UNION PACIFIC | Albany County, WY | Oil Property | May 2026 |
| 557 | UNION PACIFIC | Crockett County, TX | Oil & Gas Property | Apr 2026 |
| 558 | UNION PACIFIC 7 | Crockett County, TX | Oil & Gas Property | Apr 2026 |
| 559 | UNION POWER C | Union Parish, LA | Gas Property | Dec 2024 |
| 560 | UNION PROD | Union Parish, LA | Gas Property | Dec 2024 |
| 561 | UNION PRODUCING | Ouachita Parish, LA | Gas Property | Nov 2024 |
| 562 | UNION RAILROAD | Allegheny County, PA | Gas Property | Dec 2025 |
| 563 | UNION RANCH | Webb County, TX | Oil & Gas Property | Apr 2026 |
| 564 | UNION SAWMILL | Union County, AR | Oil Property | Mar 2026 |
| 565 | UNION SI FEDERAL | Chaves County, NM | Oil & Gas Property | Jul 2022 |
| 566 | UNION ST | Union Parish, LA | Gas Property | Nov 2024 |
| 567 | UNION STATE | Lea County, NM | Oil & Gas Property | May 2026 |
| 568 | UNION STATE | Lea County, NM | Oil & Gas Property | Dec 2005 |
| 569 | UNION SUGAR | Santa Barbara County, CA | Oil & Gas Property | Mar 2026 |
| 570 | UNION SUGAR | Santa Barbara County, CA | Oil & Gas Property | May 2026 |
| 571 | UNION VALLEY A | Dawson County, TX | Oil & Gas Property | Apr 2026 |
| 572 | UNION-CONTINENTAL | Santa Barbara County, CA | Oil & Gas Property | Dec 2012 |
| 573 | UNION-HOYT | Kern County, CA | Oil & Gas Property | May 2026 |
| 574 | UNION-MILLER | Kern County, CA | Oil Property | May 1991 |
| 575 | UNION-NARANJAL | Orange County, CA | Oil & Gas Property | May 2026 |
| 576 | UNION-STATE | Crockett County, TX | Oil & Gas Property | Apr 2026 |
| 577 | UNION-TOWN STANNUS UNIT | Union County, KY | Oil Property | Jan 2011 |
| 578 | UNIONTOWN | Union County, KY | Oil Property | Dec 2024 |
| 579 | UNIONTOWN FIELD UNIT | Union County, KY | Oil Property | Dec 2024 |
| 580 | UNISON | Tarrant County, TX | Gas Property | Apr 2026 |
| 581 | UNIT | Washakie County, WY | Oil & Gas Property | Oct 2023 |
| 582 | UNIT | Fremont County, WY | Oil Property | Apr 2026 |
| 583 | UNIT | Powder River County, MT | Oil & Gas Property | Apr 2026 |
| 584 | UNIT | Natrona County, WY | Oil & Gas Property | Dec 2025 |
| 585 | UNIT | Campbell County, WY | Oil & Gas Property | Apr 2026 |
| 586 | UNIT | Wilson County, KS | Oil & Gas Property | Mar 2026 |
| 587 | UNIT | Johnson County, WY | Oil & Gas Property | Oct 1989 |
| 588 | UNIT | Musselshell County, MT | Oil Property | Oct 2012 |
| 589 | UNIT | Park County, WY | Oil & Gas Property | May 2026 |
| 590 | UNIT | Hot Springs County, WY | Oil & Gas Property | Apr 2026 |
| 591 | UNIT | Fremont County, WY | Oil Property | May 2026 |
| 592 | UNIT | Sublette County, WY | Oil & Gas Property | Jul 1992 |
| 593 | UNIT | Powder River County, MT | Oil & Gas Property | Apr 2026 |
| 594 | UNIT | Sublette County, WY | Gas Property | Jan 1991 |
| 595 | UNIT | Simpson County, MS | Oil Property | Jun 1988 |
| 596 | UNIT | Natrona County, WY | Oil & Gas Property | Oct 2025 |
| 597 | UNIT | Powder River County, MT | Oil & Gas Property | Apr 2026 |
| 598 | UNIT | Laramie County, WY | Oil & Gas Property | Dec 2025 |
| 599 | UNIT | Hot Springs County, WY | Oil & Gas Property | Apr 2026 |
| 600 | UNIT | Adams County, MS | Oil Property | Oct 1989 |