| 401 | BLACH | Yuma County, CO | Gas Property | May 2026 |
| 402 | BLACH | Yuma County, CO | Gas Property | May 2026 |
| 403 | BLACH | Yuma County, CO | Gas Property | Nov 2017 |
| 404 | BLACK 21-22 | La Plata County, CO | Gas Property | May 2026 |
| 405 | BLACK RIDGE | La Plata County, CO | Gas Property | May 2026 |
| 406 | BLACK TIGER | Weld County, CO | Oil & Gas Property | May 2026 |
| 407 | BLACKCOMB | Lincoln County, CO | Oil & Gas Property | Apr 2026 |
| 408 | BLACKMAN | Mesa County, CO | Oil & Gas Property | May 2026 |
| 409 | BLAKE | Washington County, CO | Oil & Gas Property | May 2026 |
| 410 | BLAKE B29 | Weld County, CO | Oil & Gas Property | Mar 2017 |
| 411 | BLANCA | Weld County, CO | Oil & Gas Property | May 2026 |
| 412 | BLANCHE C HOPKINS | Weld County, CO | Oil & Gas Property | May 2026 |
| 413 | BLASER | Yuma County, CO | Gas Property | May 2026 |
| 414 | BLEDSOE | Yuma County, CO | Gas Property | Aug 2022 |
| 415 | BLEDSOE | Cheyenne County, CO | Oil & Gas Property | May 2026 |
| 416 | BLEDSOE | Yuma County, CO | Gas Property | Aug 2022 |
| 417 | BLEDSOE FEDERAL | Yuma County, CO | Gas Property | Aug 2022 |
| 418 | BLEHM | Weld County, CO | Oil & Gas Property | May 2026 |
| 419 | BLEHM | Weld County, CO | Oil & Gas Property | Jun 2025 |
| 420 | BLEHM | Weld County, CO | Oil & Gas Property | May 2026 |
| 421 | BLEHM WEST 6X-HC-07-07-67 | Weld County, CO | Oil & Gas Property | May 2026 |
| 422 | BLISS 1 | Weld County, CO | Oil & Gas Property | Apr 2017 |
| 423 | BLOCK | La Plata County, CO | Oil & Gas Property | May 2026 |
| 424 | BLOCK 17 | La Plata County, CO | Gas Property | May 2026 |
| 425 | BLOMENKAMP | Washington County, CO | Oil Property | May 2026 |
| 426 | BLOSKAS | Weld County, CO | Oil & Gas Property | Jun 2017 |
| 427 | BLUE 3-65 3 | Adams County, CO | Oil & Gas Property | May 2026 |
| 428 | BLUE CHIP 22 | Weld County, CO | Oil & Gas Property | May 2026 |
| 429 | BLUE FED 3-65 33-32-31-36 3 | Adams County, CO | Oil & Gas Property | May 2026 |
| 430 | BLUE GRAVEL | Moffat County, CO | Oil & Gas Property | Jan 2025 |
| 431 | BLUE TEAL | Weld County, CO | Oil & Gas Property | May 2026 |
| 432 | BLUFF FEDERAL | Weld County, CO | Oil & Gas Property | May 2026 |
| 433 | BLUFF STATE 30 | Weld County, CO | Oil & Gas Property | May 2026 |
| 434 | BLUFFS | Weld County, CO | Oil & Gas Property | Sep 2015 |
| 435 | BM LAND | Weld County, CO | Oil & Gas Property | Jan 2019 |
| 436 | BMC B | Garfield County, CO | Oil & Gas Property | May 2026 |
| 437 | BMC D | Garfield County, CO | Oil & Gas Property | May 2026 |
| 438 | BOB 1-22 | Lincoln County, CO | Oil & Gas Property | May 2026 |
| 439 | BOB WHITE | Weld County, CO | Oil & Gas Property | Sep 2025 |
| 440 | BOBCAT D-SAND UNIT | Washington County, CO | Oil & Gas Property | May 2026 |
| 441 | BOCKIUS 34 | Weld County, CO | Oil & Gas Property | May 2017 |
| 442 | BOEHNER | Weld County, CO | Oil & Gas Property | May 2026 |
| 443 | BOHLENDER | Weld County, CO | Oil & Gas Property | Apr 2026 |
| 444 | BOHLENDER | Weld County, CO | Oil & Gas Property | Apr 2018 |
| 445 | BOHNEN 10 | Yuma County, CO | Gas Property | May 2026 |
| 446 | BOHRER | Weld County, CO | Oil & Gas Property | May 2026 |
| 447 | BOIES | Rio Blanco County, CO | Oil & Gas Property | May 2026 |
| 448 | BOIES | Rio Blanco County, CO | Oil & Gas Property | May 2026 |
| 449 | BOIES RANCH | Rio Blanco County, CO | Oil & Gas Property | May 2026 |
| 450 | BOIKO | Weld County, CO | Oil & Gas Property | May 2026 |
| 451 | BOLET | Weld County, CO | Oil & Gas Property | Jun 2025 |
| 452 | BOLET RED X 15 | Weld County, CO | Oil & Gas Property | Apr 2017 |
| 453 | BOLTON | Kiowa County, CO | Gas Property | Nov 2008 |
| 454 | BOMHOFF | Arapahoe County, CO | Oil & Gas Property | Feb 2026 |
| 455 | BONA STATE | Weld County, CO | Oil & Gas Property | May 2026 |
| 456 | BOND | Weld County, CO | Oil & Gas Property | Jun 2017 |
| 457 | BONDAD | La Plata County, CO | Gas Property | May 2026 |
| 458 | BONDAD 33-9 | La Plata County, CO | Oil & Gas Property | May 2026 |
| 459 | BONDS | La Plata County, CO | Gas Property | May 2026 |
| 460 | BONIFACIO GALLEGOS A | La Plata County, CO | Gas Property | May 2026 |
| 461 | BONINE 34-7-24 4 | La Plata County, CO | Gas Property | May 2026 |
| 462 | BOOMERANG | Weld County, CO | Oil & Gas Property | May 2026 |
| 463 | BOOMHOG | Weld County, CO | Oil & Gas Property | May 2026 |
| 464 | BOOMSLANG FED 8-60 14 | Weld County, CO | Oil & Gas Property | May 2026 |
| 465 | BOOTH | Weld County, CO | Oil & Gas Property | Nov 2025 |
| 466 | BOOTH | Weld County, CO | Oil & Gas Property | May 2026 |
| 467 | BOOTH | Weld County, CO | Oil & Gas Property | May 2026 |
| 468 | BOOTH | Weld County, CO | Oil & Gas Property | May 2026 |
| 469 | BOOTH FEDERAL DD06-7 | Weld County, CO | Oil & Gas Property | May 2026 |
| 470 | BOOTH STATE | Weld County, CO | Oil & Gas Property | May 2026 |
| 471 | BOOTH STATE C | Weld County, CO | Oil & Gas Property | May 2026 |
| 472 | BOOTH USX EE | Weld County, CO | Oil & Gas Property | Jan 2026 |
| 473 | BORN SITZMAN | Weld County, CO | Oil & Gas Property | May 2023 |
| 474 | BORUCH GM | Garfield County, CO | Oil & Gas Property | May 2026 |
| 475 | BORYS C22 | Weld County, CO | Oil & Gas Property | May 2026 |
| 476 | BOSELY | Garfield County, CO | Oil & Gas Property | May 2026 |
| 477 | BOSLEY | Garfield County, CO | Oil & Gas Property | May 2026 |
| 478 | BOSLEY | Morgan County, CO | Oil Property | Sep 2025 |
| 479 | BOST FARM | Weld County, CO | Oil & Gas Property | May 2026 |
| 480 | BOULDER BANK | Weld County, CO | Oil & Gas Property | Jul 2018 |
| 481 | BOULTER | Weld County, CO | Oil & Gas Property | May 2026 |
| 482 | BOULTER | Weld County, CO | Oil & Gas Property | Oct 2022 |
| 483 | BOULTER STATE G | Weld County, CO | Oil & Gas Property | May 2026 |
| 484 | BOULTON 33 | Garfield County, CO | Oil & Gas Property | May 2026 |
| 485 | BOWER | Weld County, CO | Oil & Gas Property | Aug 2023 |
| 486 | BOWMAN | Yuma County, CO | Gas Property | Aug 2022 |
| 487 | BOWMAN 1 | Yuma County, CO | Gas Property | May 2026 |
| 488 | BOX ELDER | Adams County, CO | Oil & Gas Property | May 2026 |
| 489 | BOX ELDER H | Adams County, CO | Oil & Gas Property | May 2018 |
| 490 | BOXELDER | Adams County, CO | Oil & Gas Property | May 2026 |
| 491 | BOXER UNIT | Morgan County, CO | Oil Property | May 2026 |
| 492 | BOYD | Weld County, CO | Oil & Gas Property | May 2026 |
| 493 | BOYD 24 | Weld County, CO | Oil & Gas Property | May 2026 |
| 494 | BOYD 3 | Weld County, CO | Oil & Gas Property | May 2026 |
| 495 | BOYDSTON | Weld County, CO | Oil & Gas Property | May 2026 |
| 496 | BRADBURY | Arapahoe County, CO | Oil & Gas Property | May 2018 |
| 497 | BRADBURY | Adams County, CO | Oil & Gas Property | May 2018 |
| 498 | BRADFIELD CH | La Plata County, CO | Gas Property | May 2026 |
| 499 | BRADFORD | Yuma County, CO | Gas Property | Aug 2022 |
| 500 | BRAGG | Weld County, CO | Oil & Gas Property | May 2017 |