| 601 | Northrop, Marilynne | Westfield, NY 14787 | Gas Operator | Dec 2025 |
| 602 | Northshore Petroleum LLC | | Oil Operator | Feb 2009 |
| 603 | Northstar Energy Corporation | Charleston, WV 25337-0000 | Oil & Gas Operator | Dec 2021 |
| 604 | Northstar Energy LLC | | Gas Operator | Sep 2020 |
| 605 | Northstar Gas Company Of Texas | Houston, TX 77057-2768 | Oil & Gas Operator | Jan 2026 |
| 606 | Northstar Gas Company, Inc. | | Oil & Gas Operator | Jan 2016 |
| 607 | Northstar Gas, Inc. | Orem, UT 84097-6360 | Oil & Gas Operator | Jun 2026 |
| 608 | Northstar Gulfsands, LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2006 |
| 609 | Northstar Investments, Inc. | Wichita, KS 67230 | Oil & Gas Operator | Mar 2026 |
| 610 | Northstar Offshore Group, LLC | | Oil & Gas Operator | Apr 2020 |
| 611 | Northstar Oil & Gas | Sewickley, PA 151430168 | Oil & Gas Operator | May 2005 |
| 612 | Northstar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 613 | Northstar Operating Company Of Texas | Midland, TX 79702 | Oil & Gas Operator | Feb 2008 |
| 614 | Northstar Resources, LLC | Houston, TX 77018 | Oil & Gas Operator | Jul 2026 |
| 615 | Northwest Airport Management, LP | Spring, TX 77379 | Gas Operator | Jul 2026 |
| 616 | Northwest Disposal Corporation | Laverne, OK 73848-0504 | Oil & Gas Operator | Jul 2014 |
| 617 | Northwest Energy LLC | Buffalo, WY 82834 | Gas Operator | Jan 2010 |
| 618 | Northwest Exploration | | Oil & Gas Operator | Dec 1984 |
| 619 | Northwest Exploration Co | Salt Lake City, UT 84108-0900 | Oil & Gas Operator | Sep 1991 |
| 620 | Northwest Louisiana Production LLC | | Oil & Gas Operator | Dec 2024 |
| 621 | Northwest Natural Gas Co | Albion, PA 16401-9998 | Oil & Gas Operator | Dec 1990 |
| 622 | Northwest Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Jun 2014 |
| 623 | Northwest Petroleum Inc. | | Oil & Gas Operator | Dec 2025 |
| 624 | Northwest Pipeline Company | Salt Lake City, UT 841580900 | Oil & Gas Operator | Feb 1995 |
| 625 | Northwest Well Service, Inc. | Merino, CO 80741 | Oil Operator | Mar 2002 |
| 626 | Northwestern Corporation | Butte, MT 59701 | Oil & Gas Operator | May 2026 |
| 627 | Northwestern Energy, LLC | Butte, MT 59701 | Oil & Gas Operator | Dec 2004 |
| 628 | Northwestern Inc | East Brady, PA 16028 | Gas Operator | Dec 2012 |
| 629 | Northwestern Natural Gas | | Gas Operator | Aug 2000 |
| 630 | Northwestern Production LLC | | Oil & Gas Operator | Apr 2024 |
| 631 | Northwind Development Company | | Oil Operator | Oct 1995 |
| 632 | Northwind Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 1995 |
| 633 | Northwind Oil & Gas, LLC | | Oil & Gas Operator | Nov 2019 |
| 634 | Northwind Oil Company | Tulsa, OK 74137 | Oil & Gas Operator | May 1998 |
| 635 | Northwood Energy Corp | Columbus, OH 43221 | Oil & Gas Operator | Mar 2026 |
| 636 | Northwoods Land Inc | Denver, CO 80202 | Oil & Gas Operator | May 2026 |
| 637 | Norton Drilling Co. | Levelland, TX 79336 | Oil & Gas Operator | Nov 2001 |
| 638 | Norton Frickey | Lakewood, CO 80215 | Oil & Gas Operator | Dec 2023 |
| 639 | Norton Oil Co. | | Oil & Gas Operator | Jun 1984 |
| 640 | Norvel Douglas Oil Inc. | Hot Springs V, AR 71909 | Oil Operator | Oct 2025 |
| 641 | Norwes Industries, Inc. | | Oil & Gas Operator | Jun 2000 |
| 642 | Norwood Energy, Inc | | Oil Operator | Dec 2015 |
| 643 | Norwood Oil | Greeley, CO 80634 | Oil Operator | Mar 1996 |
| 644 | Norwood Oil Corp | Malakoff, TX 75148 | Oil & Gas Operator | Oct 1995 |
| 645 | Norwood, A. N., Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 646 | Nosivad Oil, Inc. | Clyde, TX 79510 | Oil & Gas Operator | Jul 2026 |
| 647 | Nossaman E Oil Inc | Del City, OK 73155-5449 | Oil Operator | Oct 2002 |
| 648 | Nott, Gregory | Wichita, KS 67214 | Oil Operator | Mar 2026 |
| 649 | Notting Hill Energy LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Jul 2026 |
| 650 | Nottis, David J. | West Valley, NY 14171 | Gas Operator | Dec 2025 |
| 651 | Noumenon Corporation | Core, WV 26541-7072 | Oil & Gas Operator | Dec 2025 |
| 652 | Nova Energy Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2003 |
| 653 | Nova Energy Inc | Casper, WY 82601 | Oil & Gas Operator | Oct 2020 |
| 654 | Nova Natural Res Corp | Denver, CO 80202 | Oil & Gas Operator | Nov 1989 |
| 655 | Nova Petroleum Cororation | | Oil & Gas Operator | Mar 1987 |
| 656 | Nova Petroleum Corp | Salt Lake City, UT 84147 | Oil & Gas Operator | Sep 1986 |
| 657 | Novco Operating Company | Novice, TX 79538 | Oil & Gas Operator | Jul 2026 |
| 658 | Novo Energy Resources | Houston, TX 77006 | Oil & Gas Operator | Jul 2026 |
| 659 | Novo Exploration Corporation | Hurst, TX 76053 | Oil & Gas Operator | Jun 2020 |
| 660 | Novo Oil & Gas Northern Delaware, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2026 |
| 661 | Novus Louisiana LLC | | Oil & Gas Operator | Feb 2006 |
| 662 | Novus Oil & Gas, LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2005 |
| 663 | Novy Oil & Gas, Inc. | Goddard, KS 67052 | Oil & Gas Operator | Jun 2026 |
| 664 | Now Development Co., Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2017 |
| 665 | Nowata Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1997 |
| 666 | Nowata Petroleum Operating Co | Nowata, OK 74048-9617 | Oil Operator | Aug 2014 |
| 667 | Nowea, Inc | Melbourne, FL 32901 | Oil Operator | Dec 2024 |
| 668 | Noxxe | Ottawa, KS 66067 | Oil & Gas Operator | Dec 2024 |
| 669 | Noxxe Oil And Gas, LLC | Houston, TX 77269 | Oil & Gas Operator | Jul 2026 |
| 670 | NP Energy Corporation | Englewood, CO 80111 | Oil & Gas Operator | Jun 1989 |
| 671 | NP Resources, LLC | | Oil & Gas Operator | Aug 2022 |
| 672 | NPF Energy Corporation | Boise, ID 83708 | Oil & Gas Operator | Mar 2026 |
| 673 | NRC Development, LLC | | Gas Operator | Nov 2002 |
| 674 | NRD - Rein Resources, A General Partnership | Union, KY 41091 | Oil Operator | Mar 2026 |
| 675 | NRG Assets Management, LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2016 |
| 676 | NRG Oil LLC | Stratford, OK 74872-9732 | Oil Operator | Feb 2012 |
| 677 | NRG Resources, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 1987 |
| 678 | NRPC Operating, LLC | Dallas, TX 75206 | Oil Operator | Feb 2012 |
| 679 | NS Oil LLC | Minneapolis, MN 55410 | Oil Operator | Apr 2026 |
| 680 | NSP Resources, LLC | Houston, TX 77018 | Oil & Gas Operator | May 2026 |
| 681 | NT Minerals, LLC | Tulsa, OK 74172 | Oil & Gas Operator | Jul 2026 |
| 682 | NTR Energy LLC (Osage Cty Only) | | Oil & Gas Operator | Apr 2020 |
| 683 | NTS Energy LLC | Indiana, PA 15701-1801 | Oil & Gas Operator | Dec 2015 |
| 684 | Nub'S Well Servicing Inc | Ratliff City, OK 73481 | Oil & Gas Operator | May 2026 |
| 685 | Nucomer Energy LLC | Erie, PA 16510 | Oil & Gas Operator | Apr 2026 |
| 686 | Nucor Oil & Gas Inc | Riverton, WY 82501 | Oil & Gas Operator | Apr 2026 |
| 687 | Nucorp Energy, Inc. | | Oil & Gas Operator | Jan 1985 |
| 688 | Nueces Minerals Company | Dallas, TX 75251 | Oil & Gas Operator | May 2021 |
| 689 | Nueces Oil Company | George West, TX 78022 | Oil & Gas Operator | Mar 2008 |
| 690 | Nueces Petroleum Corporation | Sugar Land, TX 77496 | Oil Operator | Jul 2026 |
| 691 | Nueces Reserves, Inc. | Houston, TX 77019 | Oil & Gas Operator | Oct 2002 |
| 692 | Nuenergy LLC | | Oil & Gas Operator | May 2026 |
| 693 | Nuevida Resources, LLC | Dallas, TX 75235 | Gas Operator | Apr 2026 |
| 694 | Nuevo Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 695 | Nuevo Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2004 |
| 696 | Nuex Operating, Inc. | | Oil Operator | Oct 2004 |
| 697 | Nugulf Operating, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 698 | Null, W. M. & San Patricio Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Aug 1994 |
| 699 | Null, W.M. Operations, Inc. | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Jun 2002 |
| 700 | Numac LLC | Cherryvale, KS 67335 | Oil Operator | Mar 2026 |