| 601 | Irvin Drilling Corp | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1990 |
| 602 | J & C Oil | New Matamoras, OH 45767-6035 | Oil & Gas Operator | Dec 2024 |
| 603 | J & M Oil Co | Overland PK, KS 66209 | Oil & Gas Operator | Sep 2025 |
| 604 | J & R Oil | Chanute, KS 66720 | Oil & Gas Operator | Oct 2019 |
| 605 | J & S Oil Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2022 |
| 606 | J D Drilling Company | Basehor, KS 66007 | Oil & Gas Operator | Dec 2023 |
| 607 | J M Adams Roustabout & Pipeline Construction Inc. | New Concord, OH 43762 | Oil & Gas Operator | Dec 2024 |
| 608 | J R Development Co | Pickerington, OH 43147 | Oil & Gas Operator | Dec 1997 |
| 609 | J T Plus Well Service LLC | Corning, OH 43730 | Oil & Gas Operator | Dec 2024 |
| 610 | J V Altier Gas & Oil Co. Inc | Malta, OH 43758 | Oil & Gas Operator | Dec 2024 |
| 611 | J Well Service Inc | Warren, OH 44482 | Oil & Gas Operator | Dec 2024 |
| 612 | J-N-J Oil LLC | MT Vernon, OH 43050 | Oil Operator | Dec 2024 |
| 613 | J. D. Gas & Oil, Inc. | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2024 |
| 614 | J. D. Oil & Gas, Inc. | North Canton, OH 44720 | Oil & Gas Operator | Dec 2011 |
| 615 | Jack Moran Oil Co | Martinsburg, OH 43037 | Oil & Gas Operator | Dec 2009 |
| 616 | Jadco Energy Inc | Newcomerstown, OH 43832 | Oil & Gas Operator | Dec 2023 |
| 617 | Jadoil Inc D Vernau | Newark, OH 43055 | Oil & Gas Operator | Dec 1990 |
| 618 | James Drilling Corp | Blairsville, PA 15717 | Oil & Gas Operator | Dec 2004 |
| 619 | James R Bernhardt Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 620 | James R Smail Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2020 |
| 621 | James Wray Inc | Utica, OH 43080 | Oil & Gas Operator | Dec 2024 |
| 622 | Janco Well Operation | Canton, OH 44735 | Oil & Gas Operator | Dec 1990 |
| 623 | Jare Holdings LLC | Wooster, OH 44691 | Oil Operator | Dec 2021 |
| 624 | Jay Bee Production | Walhonding, OH 43843 | Oil & Gas Operator | Dec 2023 |
| 625 | JD Producing Inc | Burbank, OH 44214 | Oil & Gas Operator | Dec 2012 |
| 626 | Jeanie Enterprises LLC | Somerset, OH 43783 | Oil & Gas Operator | Dec 2024 |
| 627 | Jefferson Oil & Gas Company | Pickerington, OH 43147 | Oil & Gas Operator | Dec 2024 |
| 628 | Jerry Moore Inc | Hartville, OH 44632 | Oil & Gas Operator | Dec 2024 |
| 629 | Jerry Oil Co. | Riverside, IL 60546 | Oil & Gas Operator | Dec 1990 |
| 630 | JHC II LLC | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2024 |
| 631 | JMD Resources Inc | Belot, OH 44609 | Oil & Gas Operator | Dec 2015 |
| 632 | John D Oil & Gas Company | Mentor, OH 44060 | Oil & Gas Operator | Dec 2016 |
| 633 | John F Williams Oil Field Services Inc | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2024 |
| 634 | Johnson M & Gingerich M | New Lexington, OH 43764 | Oil & Gas Operator | Dec 1995 |
| 635 | Johnson Mike | MT Perry, OH 43760 | Oil & Gas Operator | Dec 2018 |
| 636 | Johnson Oil & Gas LLC | Mount Perry, OH 43760-9641 | Oil & Gas Operator | Dec 2024 |
| 637 | Jones Alan W | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1990 |
| 638 | Jonsu Oil Corp | Granville, OH 43023 | Oil & Gas Operator | Dec 1994 |
| 639 | JRD Energy | Wooster, OH 44691 | Oil & Gas Operator | Dec 1999 |
| 640 | JRM Oil Co | Dalton, OH 44618 | Oil & Gas Operator | Dec 1993 |
| 641 | K & W Oil Company | MT Carmel, IL 62830 | Oil & Gas Operator | May 2013 |
| 642 | K A Brown Oil & Gas LLC | Sardis, OH 43946 | Oil & Gas Operator | Dec 2024 |
| 643 | K. Petroleum, Inc. | Gahanna, OH 43230 | Oil & Gas Operator | Dec 2025 |
| 644 | Kastle Resources Enterprises Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2025 |
| 645 | KBD Oil And Gas Production LLC | Brinkhaven, OH 43006 | Oil & Gas Operator | Dec 2024 |
| 646 | Kehl Oil & Gas Enterprises LLC | Lower Salem, OH 45745 | Oil & Gas Operator | Dec 2024 |
| 647 | Keith Lynn Minerals LLC | Springfield, OH 45503 | Oil & Gas Operator | Dec 2024 |
| 648 | Keito Gas Inc | Reno, OH 45773 | Oil & Gas Operator | Dec 2020 |
| 649 | Keller Brothers & Co | Nelsonville, OH 45764 | Oil Operator | Dec 2019 |
| 650 | Kenoil LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 651 | Kerogen Resources | Gratiot, OH 43740 | Oil & Gas Operator | Dec 2004 |
| 652 | Ketcham VIctor A | Columbus, OH 43214 | Oil Operator | Dec 2021 |
| 653 | Kidd Charlie Drilling | Utica, OH 43080 | Oil & Gas Operator | Dec 2002 |
| 654 | Kidd William E Production | Gambier, OH 43022 | Oil & Gas Operator | Dec 1993 |
| 655 | Kilbarger Investments Inc | Logan, OH 43138 | Oil & Gas Operator | Dec 2024 |
| 656 | Killbuck Creek Oil Co LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 657 | Killbuck Oilfield Service | Killbuck, OH 44637 | Oil & Gas Operator | Dec 2022 |
| 658 | King Drilling Co | Seville, OH 44273 | Oil & Gas Operator | Jan 2025 |
| 659 | King Petroleum 2 | Nashport, OH 43830 | Oil & Gas Operator | Dec 2023 |
| 660 | Kingston Oil Corp | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2000 |
| 661 | Kistler John & Ruth | Newcomerstown, OH 43832 | Oil & Gas Operator | Dec 1998 |
| 662 | Kleese Development Associates | Youngstown, OH 44514 | Oil & Gas Operator | Dec 2024 |
| 663 | KLJ Inc | Graysville, OH 45734 | Oil & Gas Operator | Dec 2002 |
| 664 | Kmfad Oil And Gas LLC | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2023 |
| 665 | Knox Energy Inc | New Albany, OH 43054 | Oil & Gas Operator | Dec 2024 |
| 666 | Kramer Exploration Co. | Delaware, OH 43015 | Oil & Gas Operator | Dec 2009 |
| 667 | Kroll Energy LLC | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2024 |
| 668 | KST Oil & Gas Co Inc | Tallmadge, OH 44278-1142 | Oil & Gas Operator | Dec 1995 |
| 669 | Kuhn Richard F | Baltimore, OH 43105 | Oil Operator | Dec 2022 |
| 670 | Kundtz Properties Inc | Orange VIllage, OH 44122 | Gas Operator | Dec 2024 |
| 671 | L & B Energy LLP | Kingsville, OH 44048 | Oil & Gas Operator | Dec 2023 |
| 672 | L & F Oil & Gas LLC | New Comerstown, OH 43832 | Oil & Gas Operator | Dec 2024 |
| 673 | L & M Petroleum Co | Reno, OH 45773 | Oil & Gas Operator | Dec 1987 |
| 674 | L & S Oil And Gas | Newark, OH 43055-8732 | Oil & Gas Operator | Dec 2014 |
| 675 | Lahd Energy Inc | Canton, OH 44709 | Gas Operator | Dec 2009 |
| 676 | Lake Energy LLC | Chagrin Falls, OH 44023 | Oil & Gas Operator | Dec 2024 |
| 677 | Lake Region Oil Inc | Massillon, OH 44648 | Oil & Gas Operator | Dec 2024 |
| 678 | Lakewood Operating, LTD. | Midland, TX 79702 | Oil & Gas Operator | Mar 2026 |
| 679 | Landmark 4 LLC | Dalton, OH 44618-1111 | Oil & Gas Operator | Dec 2024 |
| 680 | Landprovest Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1993 |
| 681 | Lang Larry D | Beverly, OH 45715 | Oil & Gas Operator | Dec 2024 |
| 682 | Langasco Energy Corp | Alliance, OH 44601 | Oil & Gas Operator | Dec 1987 |
| 683 | Larry H Wright Inc | Naples, FL 34108-2156 | Oil & Gas Operator | Dec 1993 |
| 684 | Lauber Floyd | Dayton, OH 45415 | Oil & Gas Operator | Dec 1997 |
| 685 | Lawrence Smith Oil LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2023 |
| 686 | Layline Oil And Gas LLC | Marion, MI 49665 | Oil & Gas Operator | Dec 2025 |
| 687 | LBJ Drilling Co Inc | Martinsburg, OH 43037 | Oil & Gas Operator | Dec 2024 |
| 688 | Leach Joseph L | Gallipolis, OH 45631 | Oil & Gas Operator | Dec 2023 |
| 689 | Leader Equities Inc | Columbus, OH 43214 | Oil & Gas Operator | Dec 1988 |
| 690 | Legacy Ogc LLC | Erie, PA 16509 | Oil & Gas Operator | Dec 2025 |
| 691 | Lekan James V | Ashland, OH 44805 | Oil & Gas Operator | Dec 1997 |
| 692 | Lengacher William P | Creston, OH 44217 | Oil & Gas Operator | Dec 2024 |
| 693 | Leslie Oil & Gas Co Inc | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1991 |
| 694 | Letog LLC | Orwell, OH 44076 | Oil & Gas Operator | Dec 2024 |
| 695 | Levengood Oil & Gas(Us)In | Dover, OH 44621-2900 | Oil & Gas Operator | Dec 1997 |
| 696 | Liberty Oil & Gas Corp | Olney, IL 62450-2489 | Oil & Gas Operator | Dec 2021 |
| 697 | Lighthizer Charles O | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1997 |
| 698 | Lincoln Oil Well Service | Riverside, IL 60546 | Oil & Gas Operator | Dec 1990 |
| 699 | Lippizan Petroleum, Inc. | Ellenboro, WV 26346 | Oil & Gas Operator | Dec 2024 |
| 700 | Lishberg Petroleum Inc | Jerusaleum, OH 43747 | Oil & Gas Operator | Dec 2024 |