| 21001 | Northeast Resources | | Oil & Gas Operator | Jan 1992 |
| 21002 | Northeast Shelf LLC | Skiatook, OK 74070 | Oil & Gas Operator | Jun 2017 |
| 21003 | Northeast Texas Production Co. | Marshall, TX 75671 | Oil & Gas Operator | Apr 2025 |
| 21004 | Northeastern Energy | Warren, OH 44484 | Oil & Gas Operator | Dec 1991 |
| 21005 | Northeastern Energy Corp | | Oil & Gas Operator | Dec 2015 |
| 21006 | Northeastern Opr Co Inc | Shelocta, PA 15774-2346 | Gas Operator | Dec 2024 |
| 21007 | Northern Energy Devel. Co. | | Gas Operator | Dec 1995 |
| 21008 | Northern Energy Management | | Oil & Gas Operator | Nov 2019 |
| 21009 | Northern Gas Pro | | Gas Operator | Jun 1994 |
| 21010 | Northern Lights | | Oil & Gas Operator | Apr 1993 |
| 21011 | Northern Lights Oil Company, LLC | Andover, KS 67002 | Oil & Gas Operator | Dec 2024 |
| 21012 | Northern Michigan Expl Co | | Oil & Gas Operator | Jul 1990 |
| 21013 | Northern Michigan Oil & Gas Corporation | | Oil & Gas Operator | Dec 2024 |
| 21014 | Northern Natural Gas Prod | | Gas Operator | Oct 1989 |
| 21015 | Northern Natural Gas Producing | | Gas Operator | Jan 1991 |
| 21016 | Northern Oil Production, Inc. | Bozeman, MT 59718 | Oil & Gas Operator | Jan 2025 |
| 21017 | Northern Pacific Oil And Gas Incorporated | Houston, TX 77024 | Oil & Gas Operator | Dec 2022 |
| 21018 | Northern Processors Inc | The Woodlands, TX 77387-9385-9385 | Oil & Gas Operator | Sep 2010 |
| 21019 | Northern Producing LLC | Shelby, MT 59474 | Oil Operator | Jan 2025 |
| 21020 | Northern Production Co | Gillette, WY 82717 | Oil & Gas Operator | Apr 2013 |
| 21021 | Northern Pump Company | Denver, CO 80202-3130 | Oil & Gas Operator | Feb 2006 |
| 21022 | Northfield Enterprises | Bryan, TX 77805 | Oil & Gas Operator | Dec 1993 |
| 21023 | Northfield Enterprises, Inc. | Bryan, TX 77805 | Oil & Gas Operator | Apr 2025 |
| 21024 | Northfork Exploration LLC | Electra, TX 76360 | Oil Operator | Apr 2025 |
| 21025 | Northla Productions, LLC | | Oil & Gas Operator | Dec 2024 |
| 21026 | Northland Holdings, Inc. | Calgary, AB T2J 7H2 | Gas Operator | May 2017 |
| 21027 | Northland Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2003 |
| 21028 | Northland Petroleum, Inc. | Houston, TX 77043 | Oil Operator | Dec 2018 |
| 21029 | Northland Petroleum, LLC | Houston, TX 77043 | Oil Operator | Apr 2025 |
| 21030 | Northport Production Company | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2025 |
| 21031 | Northridge Exploration, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 21032 | Northridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 21033 | Northrop, Marilynne | Westfield, NY 14787 | Gas Operator | Dec 2023 |
| 21034 | Northshore Petroleum LLC | | Oil Operator | Feb 2009 |
| 21035 | Northstar Energy Corporation | Charleston, WV 25337-0000 | Oil & Gas Operator | Dec 2021 |
| 21036 | Northstar Energy LLC | | Gas Operator | Sep 2020 |
| 21037 | Northstar Gas Company Inc | | Oil & Gas Operator | Jan 2016 |
| 21038 | Northstar Gas Company Of Texas | Houston, TX 77057-2768 | Oil & Gas Operator | Jan 2016 |
| 21039 | Northstar Gulfsands, LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2006 |
| 21040 | Northstar Investments, Inc. | Wichita, KS 67230 | Oil & Gas Operator | Dec 2024 |
| 21041 | Northstar Offshore Group, LLC | | Oil & Gas Operator | Apr 2020 |
| 21042 | Northstar Oil & Gas | Sewickley, PA 151430168 | Oil & Gas Operator | May 2005 |
| 21043 | Northstar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 21044 | Northstar Operating Company Of Texas | Midland, TX 79702 | Oil & Gas Operator | Feb 2008 |
| 21045 | Northstar Resources Inc. | | Gas Operator | Dec 2024 |
| 21046 | Northwest Airport Management, LP | Spring, TX 77379 | Gas Operator | Apr 2025 |
| 21047 | Northwest Disposal Corporation | Laverne, OK 73848-0504 | Oil & Gas Operator | Jul 2014 |
| 21048 | Northwest Energy LLC | Buffalo, WY 82834 | Gas Operator | Jan 2010 |
| 21049 | Northwest Exploration | | Oil & Gas Operator | Dec 1984 |
| 21050 | Northwest Exploration Co | Salt Lake City, UT 84108-0900 | Oil & Gas Operator | Sep 1991 |
| 21051 | Northwest Louisiana Production LLC | | Oil & Gas Operator | Dec 2024 |
| 21052 | Northwest Natural Gas Co | Albion, PA 16401-9998 | Oil & Gas Operator | Dec 1990 |
| 21053 | Northwest Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Jun 2014 |
| 21054 | Northwest Petroleum Inc. | | Oil & Gas Operator | Dec 2024 |
| 21055 | Northwest Pipeline Company | Salt Lake City, UT 841580900 | Oil & Gas Operator | Feb 1995 |
| 21056 | Northwest Well Service, Inc. | Merino, CO 80741 | Oil Operator | Mar 2002 |
| 21057 | Northwestern Corporation | Butte, MT 59701 | Oil & Gas Operator | Jan 2025 |
| 21058 | Northwestern Energy, LLC | Butte, MT 59701 | Oil & Gas Operator | Dec 2004 |
| 21059 | Northwestern Inc | East Brady, PA 16028 | Gas Operator | Dec 2012 |
| 21060 | Northwestern Natural Gas | | Gas Operator | Aug 2000 |
| 21061 | Northwestern Production LLC | | Oil & Gas Operator | Apr 2024 |
| 21062 | Northwind Development Company | | Oil Operator | Oct 1995 |
| 21063 | Northwind Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 1995 |
| 21064 | Northwind Oil & Gas, LLC | | Oil & Gas Operator | Nov 2019 |
| 21065 | Northwind Oil Company | Tulsa, OK 74137 | Oil & Gas Operator | May 1998 |
| 21066 | Northwood Energy Corp | Columbus, OH 43221 | Oil & Gas Operator | Dec 2024 |
| 21067 | Norton Drilling Co. | Levelland, TX 79336 | Oil & Gas Operator | Nov 2001 |
| 21068 | Norton Frickey | Lakewood, CO 80215 | Oil & Gas Operator | Dec 2023 |
| 21069 | Norton Oil Co. | | Oil & Gas Operator | Jun 1984 |
| 21070 | Norvel Douglas Oil Inc. | H SPG NTL PK, AR 71909 | Oil Operator | Apr 2025 |
| 21071 | Norwes Industries, Inc. | | Oil & Gas Operator | Jun 2000 |
| 21072 | Norwood Energy, Inc | | Oil Operator | Dec 2015 |
| 21073 | Norwood Oil | Greeley, CO 80634 | Oil Operator | Mar 1996 |
| 21074 | Norwood Oil Corp | Malakoff, TX 75148 | Oil & Gas Operator | Oct 1995 |
| 21075 | Norwood, A. N., Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 21076 | Nosivad Oil, Inc. | Clyde, TX 79510 | Oil & Gas Operator | Apr 2025 |
| 21077 | Nossaman E Oil Inc | Del City, OK 73155-5449 | Oil Operator | Oct 2002 |
| 21078 | Nott, Gregory | Wichita, KS 67214 | Oil Operator | Dec 2024 |
| 21079 | Notting Hill Energy LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Apr 2025 |
| 21080 | Nottis, David J. | West Valley, NY 14171 | Gas Operator | Dec 2023 |
| 21081 | Noumenon Corporation | Core, WV 26541-7072 | Oil & Gas Operator | Dec 2024 |
| 21082 | Nova Energy Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2003 |
| 21083 | Nova Energy Inc | Casper, WY 82601 | Oil & Gas Operator | Oct 2020 |
| 21084 | Nova Natural Res Corp | Denver, CO 80202 | Oil & Gas Operator | Nov 1989 |
| 21085 | Nova Petroleum Cororation | | Oil & Gas Operator | Mar 1987 |
| 21086 | Nova Petroleum Corp | Salt Lake City, UT 84147 | Oil & Gas Operator | Sep 1986 |
| 21087 | Novco Operating Company | Novice, TX 79538 | Oil & Gas Operator | Apr 2025 |
| 21088 | Novo Energy Resources | Houston, TX 77006 | Oil & Gas Operator | Apr 2025 |
| 21089 | Novo Exploration Corporation | Hurst, TX 76053 | Oil & Gas Operator | Jun 2020 |
| 21090 | Novo Oil & Gas Northern Delaware, LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 21091 | Novus Louisiana LLC | | Oil & Gas Operator | Feb 2006 |
| 21092 | Novus Oil & Gas, LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2005 |
| 21093 | Novy Oil & Gas, Inc. | Goddard, KS 67052 | Oil & Gas Operator | Feb 2025 |
| 21094 | Now Development Co., Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2017 |
| 21095 | Nowata Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1997 |
| 21096 | Nowata Petroleum Operating Co | Nowata, OK 74048-9617 | Oil Operator | Aug 2014 |
| 21097 | Noxxe | Ottawa, KS 66067 | Oil & Gas Operator | Dec 2023 |
| 21098 | Noxxe Oil And Gas, LLC | Houston, TX 77269 | Oil & Gas Operator | Apr 2025 |
| 21099 | NP Energy Corporation | Englewood, CO 80111 | Oil & Gas Operator | Jun 1989 |
| 21100 | NP Resources, LLC | | Oil & Gas Operator | Aug 2022 |