| 801 | ISLAND CREEK | Mingo County, WV | Gas Property | Dec 2021 |
| 802 | ISLAND CREEK CO | Hopkins County, KY | Oil & Gas Property | Jan 2024 |
| 803 | ISLAND CREEK CO | Logan County, WV | Oil & Gas Property | Dec 2021 |
| 804 | ISLAND CREEK COAL | Upshur County, WV | Oil & Gas Property | Dec 2021 |
| 805 | ISLAND CREEK COAL C | McDowell County, WV | Gas Property | Dec 2021 |
| 806 | ISLAND CREEK COAL CO | Hopkins County, KY | Oil & Gas Property | Dec 2014 |
| 807 | ISLAND LAKE 6092 12-24H | Burke County, ND | Oil & Gas Property | Jun 2026 |
| 808 | ISLAND PARK B | Garfield County, CO | Oil & Gas Property | Jan 2026 |
| 809 | ISLAND RANCH | Garfield County, CO | Oil & Gas Property | May 2026 |
| 810 | ISLAND U | Uintah County, UT | Oil & Gas Property | Dec 2015 |
| 811 | ISLAND U | Uintah County, UT | Oil & Gas Property | Jun 2026 |
| 812 | ISLAND UNIT | Uintah County, UT | Oil & Gas Property | Jun 2026 |
| 813 | ISLE | Montgomery County, KS | Gas Property | May 2026 |
| 814 | ISLE ROYAL 148-95-02A-11H-TF-LL | Dunn County, ND | Oil & Gas Property | Jun 2026 |
| 815 | ISLE ROYALE 20-5 | Dawson County, TX | Oil & Gas Property | Jun 2026 |
| 816 | ISLER FE | Chaves County, NM | Gas Property | Jun 2026 |
| 817 | ISLER FEDERAL | Chaves County, NM | Oil & Gas Property | Jun 2017 |
| 818 | ISLER PENNZOIL FEDERAL | Chaves County, NM | Gas Property | Apr 2020 |
| 819 | ISLES LANE | Caddo Parish, LA | Oil Property | Nov 2024 |
| 820 | ISLEY | Okmulgee County, OK | Gas Property | Jan 2013 |
| 821 | ISLEY I | Gregg County, TX | Oil & Gas Property | Jun 2026 |
| 822 | ISMAY FLODINE | San Juan County, UT | Oil & Gas Property | Jul 2026 |
| 823 | ISMERT 2 | Reno County, KS | Oil & Gas Property | May 2026 |
| 824 | ISOM | Texas County, OK | Oil & Gas Property | Jun 2026 |
| 825 | ISOM | Stevens County, KS | Gas Property | Mar 2026 |
| 826 | ISON | Elliott County, KY | Oil Property | Dec 2023 |
| 827 | ISON, ANDERSON | Elliott County, KY | Oil & Gas Property | Dec 2015 |
| 828 | ISON, CALLIE | Letcher County, KY | Oil & Gas Property | Dec 2024 |
| 829 | ISON, JAMES D | Letcher County, KY | Gas Property | Dec 2019 |
| 830 | ISON, JEFFERSON | Letcher County, KY | Gas Property | Dec 2024 |
| 831 | ISON, JESSE | Letcher County, KY | Oil & Gas Property | Dec 2024 |
| 832 | ISON, MOSES 7 | Letcher County, KY | Gas Property | Dec 2024 |
| 833 | ISON, O D | Elliott County, KY | Oil & Gas Property | Dec 2019 |
| 834 | ISON, TIVIS & REEDA | Elliott County, KY | Oil & Gas Property | Sep 2024 |
| 835 | ISRAEL | Ford County, KS | Oil Property | May 2026 |
| 836 | ISRAEL | Wise County, TX | Oil & Gas Property | Jun 2026 |
| 837 | ISRAEL | Morton County, KS | Oil & Gas Property | May 2026 |
| 838 | ISRAEL BARNETT | Jefferson County, OK | Oil Property | Jul 2026 |
| 839 | ISRAEL GAS UNIT | Stanton County, KS | Gas Property | May 2026 |
| 840 | ISSLER | Chautauqua County, NY | Gas Property | Dec 2025 |
| 841 | ISZLEY-USA | McKenzie County, ND | Oil & Gas Property | Jun 2026 |
| 842 | ITALIAN STALLION | Fayette County, TX | Oil & Gas Property | Apr 2026 |
| 843 | ITCH STATE | Lea County, NM | Oil & Gas Property | Jun 2026 |
| 844 | ITHACA 15 14 | Eddy County, NM | Oil & Gas Property | Jun 2026 |
| 845 | ITHACA 42 | Glasscock County, TX | Oil & Gas Property | Jun 2026 |
| 846 | ITTNER | Cheyenne County, NE | Oil Property | Dec 2025 |
| 847 | IVA #1-19 | McClain County, OK | Oil & Gas Property | Jul 2026 |
| 848 | IVA 1-6H | Williams County, ND | Oil & Gas Property | Jun 2026 |
| 849 | IVA JO | Caddo County, OK | Oil & Gas Property | Jul 2026 |
| 850 | IVA THOMSON | Clearfield County, PA | Gas Property | Dec 2025 |
| 851 | IVAN | McKenzie County, ND | Oil & Gas Property | Jun 2026 |
| 852 | IVAN AND ALBERT CHRISTENSON | Bottineau County, ND | Oil & Gas Property | Jun 2026 |
| 853 | IVAN C FETTERMAN | Indiana County, PA | Gas Property | Dec 2025 |
| 854 | IVAN CS FED | Campbell County, WY | Gas Property | Aug 2018 |
| 855 | IVAN FAIL | Wilson County, KS | Gas Property | May 2026 |
| 856 | IVAN GEHRINGER | Bottineau County, ND | Oil Property | Jun 2026 |
| 857 | IVAN HECKER USA 41-6H | Dunn County, ND | Oil & Gas Property | Jun 2026 |
| 858 | IVAN RIVER UNIT | Tyonek Quadrangle, AK | Gas Property | Feb 2026 |
| 859 | IVAN W LEAMER | Clearfield County, PA | Gas Property | Dec 2025 |
| 860 | IVAR THE BONELESS FEDERAL | Lea County, NM | Oil & Gas Property | Jun 2026 |
| 861 | IVAS SMITH 0 | Live Oak County, TX | Oil & Gas Property | Jun 2026 |
| 862 | IVEN | Kingfisher County, OK | Oil & Gas Property | Jun 2026 |
| 863 | IVENS | Sherman County, TX | Gas Property | Jun 2026 |
| 864 | IVENS | Sherman County, TX | Oil & Gas Property | Jun 2026 |
| 865 | IVER & MINNIE | Stark County, ND | Oil & Gas Property | Jun 2026 |
| 866 | IVER GRAVSETH | Bottineau County, ND | Oil Property | Sep 1960 |
| 867 | IVERS | La Plata County, CO | Gas Property | May 2026 |
| 868 | IVERSEN | Richland County, MT | Oil & Gas Property | Jun 2026 |
| 869 | IVERSON | Richland County, MT | Oil & Gas Property | Jun 2026 |
| 870 | IVERSON | Liberty County, MT | Oil & Gas Property | Apr 2026 |
| 871 | IVERSON | Mountrail County, ND | Oil & Gas Property | Jun 2026 |
| 872 | IVERSON | Roosevelt County, MT | Oil & Gas Property | Jun 2026 |
| 873 | IVERSON | Andrews County, TX | Oil & Gas Property | Jun 2026 |
| 874 | IVERSON | Richland County, MT | Oil & Gas Property | Feb 2026 |
| 875 | IVERSON | Andrews County, TX | Oil & Gas Property | Jun 2026 |
| 876 | IVERSON | McKenzie County, ND | Oil & Gas Property | Jun 2026 |
| 877 | IVERSON | Pondera County, MT | Gas Property | Oct 2024 |
| 878 | IVERSON 14-11H | Williams County, ND | Oil & Gas Property | Jun 2026 |
| 879 | IVERSON 17 | Martin County, TX | Oil & Gas Property | Apr 2026 |
| 880 | IVERSON USA 14-26TFH | McKenzie County, ND | Oil & Gas Property | Jun 2026 |
| 881 | IVERSON-COWDEN | Winkler County, TX | Oil & Gas Property | Mar 2009 |
| 882 | IVES | Seward County, KS | Gas Property | May 2026 |
| 883 | IVESTOR | Wheeler County, TX | Oil & Gas Property | Jun 2026 |
| 884 | IVEY | Eddy County, NM | Oil & Gas Property | Apr 2026 |
| 885 | IVEY | Jack County, TX | Oil & Gas Property | Jun 2026 |
| 886 | IVEY | Pittsburg County, OK | Gas Property | Jun 2026 |
| 887 | IVEY | Adams County, CO | Oil & Gas Property | May 2026 |
| 888 | IVEY | Hockley County, TX | Oil & Gas Property | Jun 2026 |
| 889 | IVEY | Hockley County, TX | Oil & Gas Property | Jun 2026 |
| 890 | IVEY LC 26-36 | Adams County, CO | Oil & Gas Property | May 2026 |
| 891 | IVEY RANCH | Dimmit County, TX | Oil & Gas Property | Jun 2026 |
| 892 | IVEY UNIT | Karnes County, TX | Oil & Gas Property | Jun 2026 |
| 893 | IVEY, WILL | Madison County, TX | Oil & Gas Property | Apr 2026 |
| 894 | IVINS 1 | Blaine County, OK | Oil & Gas Property | Jun 2026 |
| 895 | IVINS 1-1 | Blaine County, OK | Oil & Gas Property | Nov 2015 |
| 896 | IVORE 35 FEDERAL COM | Eddy County, NM | Oil & Gas Property | Jul 2026 |
| 897 | IVORY | Rio Blanco County, CO | Gas Property | Dec 2022 |
| 898 | IVORY | Grant Parish, LA | Oil Property | Nov 2024 |
| 899 | IVORY | Carter County, OK | Oil & Gas Property | Jun 2026 |
| 900 | IVORY | De Soto Parish, LA | Gas Property | Dec 2024 |