| 3001 | Ney Oil Operations | | Oil Operator | Apr 1998 |
| 3002 | Nicholas Water Service, Inc. | Zenda, KS 67159 | Oil Operator | Mar 2006 |
| 3003 | Nichols Fluid Service, Inc. | Liberal, KS 67901 | Oil Operator | Jun 2019 |
| 3004 | Nichols Oil Corp. | Holcomb, KS 67846 | Oil Operator | Dec 1994 |
| 3005 | Nichols, Manford, A General Partnership | Sublette, KS 67877 | Gas Operator | Jul 2024 |
| 3006 | Nickell & Son Oil & Salvage | Parker, KS 66072 | Oil Operator | Aug 2006 |
| 3007 | Nickell Drilling | | Oil Operator | Jun 2010 |
| 3008 | Niehage Oil Company, LLC | McPherson, KS 67460 | Oil Operator | May 2024 |
| 3009 | Nielson Enterpri | | Oil & Gas Operator | Sep 1987 |
| 3010 | Nitcher, Benton L. | Wellsville, KS 66092 | Oil & Gas Operator | Dec 1995 |
| 3011 | Nixon R P Operat | | Oil Operator | Aug 1995 |
| 3012 | Njre Operating Company | Tulsa, OK 74119 | Gas Operator | Dec 2016 |
| 3013 | Noah, Calvin | Valley Center, KS 67147 | Oil Operator | Oct 2010 |
| 3014 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |
| 3015 | Noble Petroleum, Inc. | Wichita, KS 67205 | Oil Operator | Sep 2013 |
| 3016 | Noir-Blanc | Russell, KS 67665 | Oil Operator | May 1992 |
| 3017 | Nondorf Oil & Ga | | Oil Operator | Dec 1986 |
| 3018 | Nor-West Kansas Oil, L.L.C. | Wakeeney, KS 67672 | Oil Operator | Dec 2019 |
| 3019 | Nordmeyer Oil, Inc. | Toronto, KS 66777 | Oil Operator | Dec 2019 |
| 3020 | Nordstrand/Galoostian Oil & Gas | Houston, TX 77056 | Oil Operator | Mar 1998 |
| 3021 | Norstar Development | Madras, OR 97741 | Oil Operator | Nov 2018 |
| 3022 | Norstar Petroleu | | Oil & Gas Operator | Dec 1996 |
| 3023 | Norstar Petroleum Inc | Englewood, CO 80112 | Oil & Gas Operator | Jul 2024 |
| 3024 | North American D | | Oil & Gas Operator | Sep 1986 |
| 3025 | North American Drilling & Exploration, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Aug 2015 |
| 3026 | North American Resources Company | Billings, MT 59101 | Oil & Gas Operator | Dec 2019 |
| 3027 | North Pacific Oil And Gas, Inc | Houston, TX 77042 | Oil Operator | Mar 2013 |
| 3028 | North Plains Corp | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2024 |
| 3029 | North Plains Oil | | Oil Operator | Jul 1990 |
| 3030 | Northern Gas Pro | | Gas Operator | Jun 1994 |
| 3031 | Northern Lights | | Oil & Gas Operator | Apr 1993 |
| 3032 | Northern Lights Oil Company, LLC | Andover, KS 67002 | Oil & Gas Operator | Jul 2024 |
| 3033 | Northern Natural Gas Prod | | Gas Operator | Oct 1989 |
| 3034 | Northern Pump Company | Denver, CO 80202-3130 | Oil & Gas Operator | Feb 2006 |
| 3035 | Northstar Investments, Inc. | Wichita, KS 67230 | Oil & Gas Operator | Jul 2024 |
| 3036 | Northwest Well Service, Inc. | Merino, CO 80741 | Oil Operator | Mar 2002 |
| 3037 | Norwood Oil | Greeley, CO 80634 | Oil Operator | Mar 1996 |
| 3038 | Nott, Gregory | Wichita, KS 67214 | Oil Operator | Jul 2024 |
| 3039 | Novy Oil & Gas, Inc. | Goddard, KS 67052 | Oil & Gas Operator | Sep 2024 |
| 3040 | Noxxe | Ottawa, KS 66067 | Oil & Gas Operator | Dec 2021 |
| 3041 | NPF Energy Corporation | Boise, ID 83708 | Oil & Gas Operator | Jul 2024 |
| 3042 | NRD - Rein Resources, A General Partnership | Union, KY 41091 | Oil Operator | Jul 2024 |
| 3043 | NTR Energy LLC | Caney, KS 67333 | Oil & Gas Operator | Apr 2020 |
| 3044 | Numac LLC | Cherryvale, KS 67335 | Oil Operator | Jun 2024 |
| 3045 | Nuss Oil Operations | | Oil & Gas Operator | Aug 1998 |
| 3046 | Nuss Sally | | Oil Operator | Mar 1982 |
| 3047 | Nuss, Fred J. | Hoisington, KS 67544 | Gas Operator | Jul 2024 |
| 3048 | Nuss, Kenneth J. | Russell, KS 67665 | Oil Operator | Aug 1997 |
| 3049 | O S & J Operatin | | Oil Operator | Nov 1984 |
| 3050 | O'Brien Energy Company | Shreveport, LA 71136 | Oil & Gas Operator | Sep 2019 |
| 3051 | O'Brien Energy Resources Corp | Portsmouth, NH 03801 | Oil & Gas Operator | Nov 2024 |
| 3052 | O'Brien Resources LLC | Shreveport, LA 71136 | Oil Operator | Nov 2017 |
| 3053 | O'Connell, James P. | Vacaville, CA 95687 | Oil Operator | Nov 2009 |
| 3054 | O'Hare Energy Co | | Oil Operator | Dec 1983 |
| 3055 | Oak Ridge LLC | Wellsville, KS 66092 | Oil Operator | Dec 2019 |
| 3056 | Oaks Petroleum I | | Oil Operator | Jul 1987 |
| 3057 | Oakwood Resources, Inc. | Dallas, TX 75374 | Oil & Gas Operator | May 1998 |
| 3058 | Oast, Thomas H. | Greenville, NC 27835 | Oil Operator | Nov 1985 |
| 3059 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 3060 | Ocean Energy Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2024 |
| 3061 | Ocfiw Oil Company, Inc. | Hartington, NE 68739 | Oil & Gas Operator | Dec 2009 |
| 3062 | Ogh Oil Company | | Oil Operator | Sep 1995 |
| 3063 | Ohio Kentucky Oil Corporation | Lexington, KY 40503 | Oil & Gas Operator | Dec 2020 |
| 3064 | Oil & Gas Producers, Inc. | Topeka, KS 66604 | Oil Operator | Jun 2004 |
| 3065 | Oil & Gas Servic | | Oil Operator | Jun 1983 |
| 3066 | Oil Capital Corporation | Littleton, CO 80122 | Gas Operator | May 2009 |
| 3067 | Oil Company Of America, Inc. | Hays, KS 67601 | Oil Operator | Dec 2009 |
| 3068 | Oil Drillers & D | | Oil & Gas Operator | Feb 1992 |
| 3069 | Oil Field Manage | | Oil Operator | Jun 1991 |
| 3070 | Oil Gas Management, Inc. | Kansas City, MO 64106 | Oil Operator | Apr 2011 |
| 3071 | Oil Internationa | | Oil Operator | Jun 1986 |
| 3072 | Oil Lift, Incorporated | Metairie, LA 70002 | Oil & Gas Operator | Apr 2020 |
| 3073 | Oil Partners | Salina, KS 67401 | Oil Operator | Jun 2001 |
| 3074 | Oil Partners, LLC | Salina, KS 67401 | Oil Operator | Jul 2024 |
| 3075 | Oil Producers In | | Oil & Gas Operator | Dec 1996 |
| 3076 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Nov 2024 |
| 3077 | Oil Production S | | Oil Operator | Sep 1993 |
| 3078 | Oil Prop Company | | Oil & Gas Operator | Sep 1995 |
| 3079 | Oil Prop Investm | | Oil Operator | Dec 1995 |
| 3080 | Oil Properties Co., Inc. | Wichita, KS 67208 | Gas Operator | Dec 2009 |
| 3081 | Oil Property Man | | Oil & Gas Operator | Jun 1995 |
| 3082 | Oil Property Management, Inc. | Attica, KS 67009 | Oil & Gas Operator | Feb 2021 |
| 3083 | Oil Tech Producers Corporation | Moundridge, KS 67107 | Gas Operator | Jul 2024 |
| 3084 | Oil-Tech Prod Co | | Oil & Gas Operator | Oct 1992 |
| 3085 | Oilfield Search | | Oil Operator | Mar 1990 |
| 3086 | Oilfield Services, LLC | Winfield, KS 67156 | Oil Operator | Nov 2017 |
| 3087 | Oilfield Truck Service | | Oil Operator | Jun 2014 |
| 3088 | Oilwell Operator | | Gas Operator | Dec 1994 |
| 3089 | Oklahoma Energy & Exploration, Inc. | Tulsa, OK 74114 | Oil Operator | Jan 1996 |
| 3090 | Oklahoma Rig & Salvage, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 3091 | Okmar Oil Compan | | Oil & Gas Operator | Feb 1995 |
| 3092 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 3093 | Okt Resources, LLC | Edmond, OK 73013 | Oil & Gas Operator | Nov 2024 |
| 3094 | Ol' Oily LLC | | Oil Operator | Jul 2024 |
| 3095 | Oleum Incorporat | | Gas Operator | Dec 1990 |
| 3096 | Olson D Producti | | Oil Operator | Jul 1994 |
| 3097 | Olson-Anderson Lease | | Oil Operator | Mar 2018 |
| 3098 | Olympic Oil, Inc. | Hutchinson, KS 67502 | Oil & Gas Operator | May 2024 |
| 3099 | Olympic Petroleu | | Oil & Gas Operator | Jul 1993 |
| 3100 | Omega Enterprise | | Oil Operator | Sep 1990 |