| 401 | CONAWAY | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 402 | CONNER | Big Horn County, MT | Gas Property | Mar 2012 |
| 403 | CONNOLE | Teton County, MT | Oil Property | Oct 2025 |
| 404 | CONNOLLY | Glacier County, MT | Oil Property | Aug 1996 |
| 405 | CONSOL | Big Horn County, MT | Gas Property | Apr 2012 |
| 406 | CONSOL FEDERAL | Big Horn County, MT | Gas Property | Apr 2012 |
| 407 | CONSOL FEDERAL 2 | Big Horn County, MT | Gas Property | Jun 2013 |
| 408 | CONSTANCE | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 409 | CONSTANCE-STONEY BUTTE HSU | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 410 | CONT | Toole County, MT | Gas Property | Nov 2025 |
| 411 | CONTINENTAL | Toole County, MT | Gas Property | Oct 2025 |
| 412 | CONTINENTAL | Toole County, MT | Oil & Gas Property | Nov 2025 |
| 413 | COON | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 414 | COONEY | Liberty County, MT | Oil & Gas Property | Oct 2025 |
| 415 | COOPER 1-10H | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 416 | COPLEY | Pondera County, MT | Oil Property | Dec 2025 |
| 417 | COPPER 2959 42-20H | Roosevelt County, MT | Oil & Gas Property | Dec 2025 |
| 418 | COPULOS | Stillwater County, MT | Gas Property | Sep 2008 |
| 419 | CORAL CR | Fallon County, MT | Oil & Gas Property | Dec 2025 |
| 420 | CORAL CREEK | Fallon County, MT | Oil & Gas Property | Dec 2025 |
| 421 | COREY | Toole County, MT | Oil & Gas Property | Oct 2025 |
| 422 | CORRAL CREEK 14-14SH | Fallon County, MT | Oil & Gas Property | Dec 2025 |
| 423 | CORRIGEUX | Glacier County, MT | Oil Property | Aug 2023 |
| 424 | COURCHENE | Roosevelt County, MT | Oil & Gas Property | Dec 2025 |
| 425 | COURTNEY | Roosevelt County, MT | Oil & Gas Property | Dec 2025 |
| 426 | COWAN | Hill County, MT | Gas Property | Jan 2002 |
| 427 | COX 2 | Fallon County, MT | Gas Property | May 2025 |
| 428 | COYOTE | Toole County, MT | Oil Property | Sep 2024 |
| 429 | COYOTE FEDERAL 2758 43-8H | Roosevelt County, MT | Oil & Gas Property | Dec 2025 |
| 430 | COYOTE-CUNDIFF 10-14-H | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 431 | CRAIG 14X-10 | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 432 | CRAIG FEDERAL | Toole County, MT | Oil & Gas Property | Sep 1990 |
| 433 | CRAWFORD A | Valley County, MT | Oil & Gas Property | Dec 2025 |
| 434 | CREIGHTON | Yellowstone County, MT | Oil Property | Jul 1993 |
| 435 | CROFT | Toole County, MT | Gas Property | Nov 2023 |
| 436 | CROFT | Carbon County, MT | Oil & Gas Property | Aug 1988 |
| 437 | CROSS | Glacier County, MT | Oil Property | Dec 2025 |
| 438 | CROW TRIB | Big Horn County, MT | Oil Property | Oct 2025 |
| 439 | CROW TRIBAL | Big Horn County, MT | Oil Property | Nov 2025 |
| 440 | CROW TRIBAL | Big Horn County, MT | Oil Property | Oct 1997 |
| 441 | CROWE | Hill County, MT | Gas Property | Dec 2025 |
| 442 | CRUSCH | Roosevelt County, MT | Oil & Gas Property | Nov 2014 |
| 443 | CRUSCH | Roosevelt County, MT | Oil & Gas Property | Nov 2013 |
| 444 | CRUSCH | Roosevelt County, MT | Oil & Gas Property | Dec 2025 |
| 445 | CSTSU | Rosebud County, MT | Oil Property | Jul 2025 |
| 446 | CULVERIN 1-32H | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 447 | CUNDIFF | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 448 | CUNDIFF 8-22 | Richland County, MT | Oil & Gas Property | Dec 2022 |
| 449 | CUNNINGHAM 1 | Hill County, MT | Gas Property | Apr 2016 |
| 450 | CURMUDGEON | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 451 | CURTIS HUNTER | Richland County, MT | Oil & Gas Property | May 2025 |
| 452 | CUTTHROAT 1-22H | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 453 | DAD FRYE FEDERAL 2758 24-32B | Roosevelt County, MT | Oil & Gas Property | Dec 2025 |
| 454 | DAFOE | Liberty County, MT | Gas Property | Dec 2025 |
| 455 | DAGNEY 21-28 #1H | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 456 | DAGNEY 33-21 | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 457 | DAHL | Valley County, MT | Oil & Gas Property | Dec 2025 |
| 458 | DAHL | Sheridan County, MT | Oil & Gas Property | Dec 2025 |
| 459 | DAHL | Sheridan County, MT | Oil & Gas Property | Oct 2025 |
| 460 | DAHLIN 2 | Hill County, MT | Gas Property | Dec 2025 |
| 461 | DAHLQUIST | Toole County, MT | Oil Property | Dec 2021 |
| 462 | DAHLQUIST | Glacier County, MT | Oil & Gas Property | Dec 2025 |
| 463 | DAISY MA | Roosevelt County, MT | Oil & Gas Property | Dec 2025 |
| 464 | DAKOTA | Toole County, MT | Oil & Gas Property | Dec 2025 |
| 465 | DAN MCGOW | Toole County, MT | Oil & Gas Property | Sep 2025 |
| 466 | DANIEL | Hill County, MT | Gas Property | Dec 2025 |
| 467 | DANIEL 1-1H | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 468 | DANIELLE 4-9 #1H | Roosevelt County, MT | Oil & Gas Property | Dec 2025 |
| 469 | DANIELS | Richland County, MT | Oil & Gas Property | May 2016 |
| 470 | DANIELS 33X-2 | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 471 | DANIELSON | Toole County, MT | Oil Property | Dec 2025 |
| 472 | DANNENBERG | Stillwater County, MT | Gas Property | May 1992 |
| 473 | DANSER 4 | Toole County, MT | Oil & Gas Property | Sep 2025 |
| 474 | DARLENE 41X-20 | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 475 | DAVEY | Blaine County, MT | Gas Property | Dec 2025 |
| 476 | DAVEY | Toole County, MT | Oil Property | Apr 2005 |
| 477 | DAVEY | Hill County, MT | Gas Property | Dec 2025 |
| 478 | DAVID | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 479 | DAVID FEDERAL 2658 43-9H | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 480 | DAVIES 1-20H | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 481 | DAY GOVERNMENT | Toole County, MT | Oil Property | Jun 2016 |
| 482 | DECKER | Big Horn County, MT | Gas Property | Jun 2013 |
| 483 | DECKER FED | Big Horn County, MT | Gas Property | Jun 2013 |
| 484 | DECKER FEDERAL 2790 11 | Big Horn County, MT | Gas Property | Dec 2012 |
| 485 | DEER CREEK | Dawson County, MT | Oil & Gas Property | Dec 2025 |
| 486 | DEES | Hill County, MT | Gas Property | Dec 2025 |
| 487 | DEHLBOM | Blaine County, MT | Gas Property | Dec 2025 |
| 488 | DEJAEGHER | Musselshell County, MT | Oil Property | Oct 2020 |
| 489 | DEL RE | Toole County, MT | Gas Property | Nov 2025 |
| 490 | DELANEY | Glacier County, MT | Gas Property | Nov 2025 |
| 491 | DELANEY FEDERAL 21-4 4-9H | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 492 | DELLA 14-23 #1H | Roosevelt County, MT | Oil & Gas Property | Dec 2025 |
| 493 | DELORES | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 494 | DEMAREST | Liberty County, MT | Oil & Gas Property | Nov 2025 |
| 495 | DEMING | Richland County, MT | Oil & Gas Property | Dec 2025 |
| 496 | DENZER | Pondera County, MT | Oil & Gas Property | Sep 2002 |
| 497 | DENZER | Pondera County, MT | Oil Property | Nov 2024 |
| 498 | DEPARMENT | Toole County, MT | Oil Property | Dec 2025 |
| 499 | DETIENNE | Roosevelt County, MT | Oil & Gas Property | Nov 2025 |
| 500 | DEVELIN GOV | Toole County, MT | Oil & Gas Property | Sep 2018 |