| 501 | MORRISON HOWARD | Noble County, OH | Oil & Gas Property | Dec 2019 |
| 502 | MORSHEISER 26-15-6 | Carroll County, OH | Oil & Gas Property | Jun 2026 |
| 503 | MORTINE | Knox County, OH | Oil Property | Dec 2025 |
| 504 | MORTON | Morrow County, OH | Oil Property | Dec 2024 |
| 505 | MORTON SALT | Wayne County, OH | Oil & Gas Property | Dec 2000 |
| 506 | MOSER | Monroe County, OH | Gas Property | Jun 2026 |
| 507 | MOSHER | Washington County, OH | Oil & Gas Property | Dec 2007 |
| 508 | MOSIER-GRIMES (ORNDOFF) | Morgan County, OH | Oil & Gas Property | Dec 2025 |
| 509 | MOSS | Noble County, OH | Oil & Gas Property | Dec 2022 |
| 510 | MOSSER | Washington County, OH | Oil Property | Dec 2025 |
| 511 | MOSSER | Washington County, OH | Oil & Gas Property | Dec 2025 |
| 512 | MOSSHOLDER | Coshocton County, OH | Oil & Gas Property | Dec 2023 |
| 513 | MOSSHOLDER | Coshocton County, OH | Oil Property | Dec 1998 |
| 514 | MOSSHOLDER | Licking County, OH | Oil Property | Dec 2015 |
| 515 | MOSURE | Hocking County, OH | Oil Property | Dec 1998 |
| 516 | MOUNTZ | Columbiana County, OH | Oil & Gas Property | Jun 2026 |
| 517 | MOWERY | Coshocton County, OH | Oil & Gas Property | Dec 2025 |
| 518 | MOWRER | Wayne County, OH | Oil & Gas Property | Dec 2025 |
| 519 | MRUGALA 6-14-3 10H | Columbiana County, OH | Oil & Gas Property | Jun 2026 |
| 520 | MUC UNIT | Stark County, OH | Oil & Gas Property | Dec 2025 |
| 521 | MUCKLEY | Stark County, OH | Oil & Gas Property | Dec 2025 |
| 522 | MUELLER 29-15-3 | Columbiana County, OH | Oil & Gas Property | Jun 2026 |
| 523 | MULICHAK | Mahoning County, OH | Oil & Gas Property | Dec 2025 |
| 524 | MULLETT | Coshocton County, OH | Oil & Gas Property | Dec 2015 |
| 525 | MULLETT W | Coshocton County, OH | Oil & Gas Property | Dec 2024 |
| 526 | MUMPER | Knox County, OH | Oil Property | Dec 1998 |
| 527 | MUNRO UNIT | Tuscarawas County, OH | Oil & Gas Property | Dec 2025 |
| 528 | MUNZ | Medina County, OH | Oil & Gas Property | Dec 2025 |
| 529 | MURFEY | Geauga County, OH | Oil & Gas Property | Dec 2025 |
| 530 | MURPHY | Tuscarawas County, OH | Oil & Gas Property | Dec 2025 |
| 531 | MURPHY | Portage County, OH | Oil & Gas Property | Dec 2025 |
| 532 | MURPHY | Noble County, OH | Oil & Gas Property | Dec 2025 |
| 533 | MURPHY | Tuscarawas County, OH | Oil & Gas Property | Dec 2014 |
| 534 | MURRAY | Tuscarawas County, OH | Oil & Gas Property | Dec 2025 |
| 535 | MURRAY | Morgan County, OH | Oil & Gas Property | Dec 2025 |
| 536 | MURRAY 5-10-4 | Harrison County, OH | Oil & Gas Property | Jun 2026 |
| 537 | MURRAY-GANNON UNIT | Morgan County, OH | Gas Property | Dec 2000 |
| 538 | MURREY | Muskingum County, OH | Oil & Gas Property | Dec 2025 |
| 539 | MUSIAL | Lake County, OH | Oil & Gas Property | Dec 2024 |
| 540 | MUSKINGUM VALLEY BEAGLE CLUB | Muskingum County, OH | Oil & Gas Property | Dec 2025 |
| 541 | MUSKINGUM WATER | Carroll County, OH | Oil & Gas Property | Dec 2025 |
| 542 | MUSKINGUM WATERSHED CONS | Tuscarawas County, OH | Gas Property | Dec 2022 |
| 543 | MUSKINGUM WATERSHED CONSERVANCY | Ashland County, OH | Gas Property | Dec 2011 |
| 544 | MUSSER | Fairfield County, OH | Oil Property | Dec 1987 |
| 545 | MUTCHLER | Tuscarawas County, OH | Oil & Gas Property | Dec 2022 |
| 546 | MVSD | Mahoning County, OH | Oil & Gas Property | Dec 2025 |
| 547 | MWCD | Noble County, OH | Oil & Gas Property | Dec 2020 |
| 548 | MWCD | Coshocton County, OH | Oil & Gas Property | Dec 2025 |
| 549 | MWCD | Tuscarawas County, OH | Oil & Gas Property | Dec 2025 |
| 550 | MWCD | Carroll County, OH | Oil & Gas Property | Dec 2025 |
| 551 | MWCD | Tuscarawas County, OH | Oil & Gas Property | Dec 2025 |
| 552 | MYERS | Wayne County, OH | Oil & Gas Property | Dec 2025 |
| 553 | MYERS | Mahoning County, OH | Oil & Gas Property | Dec 2025 |
| 554 | MYERS | Muskingum County, OH | Oil & Gas Property | Dec 2000 |
| 555 | MYERS | Ashland County, OH | Oil & Gas Property | Dec 2020 |
| 556 | MYERS | Coshocton County, OH | Oil & Gas Property | Dec 2008 |
| 557 | MYERS | Hocking County, OH | Oil & Gas Property | Dec 2004 |
| 558 | MYERS | Portage County, OH | Oil & Gas Property | Dec 2025 |
| 559 | MYERS | Portage County, OH | Oil & Gas Property | Dec 2025 |
| 560 | MYERS | Mahoning County, OH | Oil & Gas Property | Dec 2025 |
| 561 | MYERS D & R COMM | Mahoning County, OH | Oil & Gas Property | Dec 2025 |
| 562 | MYERS WM | Licking County, OH | Oil Property | Dec 2022 |
| 563 | MYERS-HALL UNIT | Mahoning County, OH | Oil & Gas Property | Dec 2025 |
| 564 | MYERS-WILSON | Mahoning County, OH | Oil & Gas Property | Dec 2025 |
| 565 | MYKRANTZ | Wayne County, OH | Oil & Gas Property | Dec 2025 |
| 566 | MYRON | Noble County, OH | Oil & Gas Property | Jun 2026 |
| 567 | MYRON & MARY JANES | Morgan County, OH | Oil & Gas Property | Dec 2021 |
| 568 | MYRON-FRAKES | Noble County, OH | Oil & Gas Property | Jun 2026 |
| 569 | MYRTLE FARMS | Wayne County, OH | Oil & Gas Property | Dec 2025 |