| 501 | MORRISON | Wayne County, OH | Oil & Gas Property | Dec 2024 |
| 502 | MORRISON | Muskingum County, OH | Oil & Gas Property | Dec 1999 |
| 503 | MORRISON | Monroe County, OH | Oil & Gas Property | Dec 2024 |
| 504 | MORRISON | Tuscarawas County, OH | Oil & Gas Property | Dec 2024 |
| 505 | MORRISON | Portage County, OH | Oil & Gas Property | Dec 2024 |
| 506 | MORRISON | Muskingum County, OH | Oil & Gas Property | Dec 2024 |
| 507 | MORRISON | Trumbull County, OH | Oil & Gas Property | Dec 2024 |
| 508 | MORRISON HOWARD | Noble County, OH | Oil & Gas Property | Dec 2019 |
| 509 | MORTINE | Knox County, OH | Oil Property | Dec 2024 |
| 510 | MORTON | Morrow County, OH | Oil Property | Dec 2024 |
| 511 | MORTON SALT | Wayne County, OH | Oil & Gas Property | Dec 2000 |
| 512 | MOSER | Monroe County, OH | Gas Property | Jun 2025 |
| 513 | MOSHER | Washington County, OH | Oil & Gas Property | Dec 2016 |
| 514 | MOSS | Noble County, OH | Oil & Gas Property | Dec 2022 |
| 515 | MOSSER | Washington County, OH | Oil Property | Dec 2024 |
| 516 | MOSSER | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 517 | MOSSHOLDER | Coshocton County, OH | Oil & Gas Property | Dec 2002 |
| 518 | MOSSHOLDER | Coshocton County, OH | Oil Property | Dec 1998 |
| 519 | MOSSHOLDER | Licking County, OH | Oil Property | Dec 2015 |
| 520 | MOSURE | Hocking County, OH | Oil Property | Dec 1998 |
| 521 | MOUNTZ | Columbiana County, OH | Oil & Gas Property | Jun 2025 |
| 522 | MOWERY | Coshocton County, OH | Oil & Gas Property | Dec 2024 |
| 523 | MOWRER | Wayne County, OH | Oil & Gas Property | Dec 2024 |
| 524 | MRUGALA 6-14-3 10H | Columbiana County, OH | Oil & Gas Property | Jun 2025 |
| 525 | MUC UNIT | Stark County, OH | Oil & Gas Property | Dec 2024 |
| 526 | MUCKLEY | Stark County, OH | Oil & Gas Property | Dec 2024 |
| 527 | MUELLER 1H | Noble County, OH | Oil & Gas Property | Jun 2025 |
| 528 | MUELLER 29-15-3 | Columbiana County, OH | Oil & Gas Property | Jun 2025 |
| 529 | MULICHAK | Mahoning County, OH | Oil & Gas Property | Dec 2024 |
| 530 | MULLETT | Coshocton County, OH | Oil & Gas Property | Dec 2015 |
| 531 | MULLETT W | Coshocton County, OH | Oil & Gas Property | Dec 2024 |
| 532 | MUMPER | Knox County, OH | Oil Property | Dec 1998 |
| 533 | MUNRO UNIT | Tuscarawas County, OH | Oil & Gas Property | Dec 2024 |
| 534 | MUNZ | Medina County, OH | Oil & Gas Property | Dec 2024 |
| 535 | MURFEY | Geauga County, OH | Oil & Gas Property | Dec 2024 |
| 536 | MURPHY | Tuscarawas County, OH | Oil & Gas Property | Dec 2024 |
| 537 | MURPHY | Portage County, OH | Oil & Gas Property | Dec 2024 |
| 538 | MURPHY | Noble County, OH | Oil & Gas Property | Dec 2024 |
| 539 | MURPHY | Tuscarawas County, OH | Oil & Gas Property | Dec 2014 |
| 540 | MURRAY | Tuscarawas County, OH | Oil & Gas Property | Dec 2024 |
| 541 | MURRAY | Morgan County, OH | Oil & Gas Property | Dec 2024 |
| 542 | MURRAY 5-10-4 | Harrison County, OH | Oil & Gas Property | Jun 2025 |
| 543 | MURRAY-GANNON UNIT | Morgan County, OH | Gas Property | Dec 2000 |
| 544 | MURREY | Muskingum County, OH | Oil & Gas Property | Dec 2024 |
| 545 | MURREY JOHN | Washington County, OH | Oil Property | Dec 2024 |
| 546 | MUSIAL | Lake County, OH | Oil & Gas Property | Dec 2024 |
| 547 | MUSKINGUM VALLEY BEAGLE CLUB | Muskingum County, OH | Oil & Gas Property | Dec 2024 |
| 548 | MUSKINGUM WATER | Carroll County, OH | Oil & Gas Property | Dec 2024 |
| 549 | MUSKINGUM WATERSHED CONSERVANCY | Ashland County, OH | Gas Property | Dec 2016 |
| 550 | MUSSER | Fairfield County, OH | Oil Property | Dec 1987 |
| 551 | MUTCHLER | Tuscarawas County, OH | Oil & Gas Property | Dec 2022 |
| 552 | MVSD | Mahoning County, OH | Oil & Gas Property | Dec 2024 |
| 553 | MWCD | Noble County, OH | Oil & Gas Property | Dec 2020 |
| 554 | MWCD | Coshocton County, OH | Oil & Gas Property | Dec 2024 |
| 555 | MWCD | Tuscarawas County, OH | Oil & Gas Property | Dec 2024 |
| 556 | MWCD | Carroll County, OH | Oil & Gas Property | Dec 2024 |
| 557 | MWCD | Tuscarawas County, OH | Oil & Gas Property | Dec 2024 |
| 558 | MYERS | Wayne County, OH | Oil & Gas Property | Dec 2024 |
| 559 | MYERS | Mahoning County, OH | Oil & Gas Property | Dec 2024 |
| 560 | MYERS | Muskingum County, OH | Oil & Gas Property | Dec 2000 |
| 561 | MYERS | Ashland County, OH | Oil & Gas Property | Dec 2020 |
| 562 | MYERS | Coshocton County, OH | Oil & Gas Property | Dec 2008 |
| 563 | MYERS | Hocking County, OH | Oil & Gas Property | Dec 2004 |
| 564 | MYERS | Portage County, OH | Oil & Gas Property | Dec 2024 |
| 565 | MYERS | Portage County, OH | Oil & Gas Property | Dec 2024 |
| 566 | MYERS | Mahoning County, OH | Oil & Gas Property | Dec 2024 |
| 567 | MYERS D & R COMM | Mahoning County, OH | Oil & Gas Property | Dec 2024 |
| 568 | MYERS WILSON | Mahoning County, OH | Oil & Gas Property | Dec 2024 |
| 569 | MYERS WM | Licking County, OH | Oil Property | Dec 2022 |
| 570 | MYERS-HALL UNIT | Mahoning County, OH | Oil & Gas Property | Dec 2024 |
| 571 | MYKRANTZ | Wayne County, OH | Oil & Gas Property | Dec 2024 |
| 572 | MYRON | Noble County, OH | Oil & Gas Property | Jun 2025 |
| 573 | MYRON & MARY JANES | Morgan County, OH | Oil & Gas Property | Dec 2021 |
| 574 | MYRTLE FARMS | Wayne County, OH | Oil & Gas Property | Dec 2024 |
| 575 | MYRTLE POTATO FARMS | Wayne County, OH | Gas Property | Dec 2022 |