| 1801 | OUKROP | Dunn County, ND | Oil & Gas Property | Jun 2026 |
| 1802 | OUR DIANE | Weld County, CO | Oil & Gas Property | May 2026 |
| 1803 | OUR LAND | Harrison County, OH | Oil & Gas Property | Jun 2026 |
| 1804 | OURAY | Uintah County, UT | Oil & Gas Property | Jun 2026 |
| 1805 | OURAY | Uintah County, UT | Oil & Gas Property | Jun 2026 |
| 1806 | OURAY FEDERAL COM | Lea County, NM | Oil & Gas Property | Jun 2026 |
| 1807 | OURAY STATE | Reeves County, TX | Oil & Gas Property | Jun 2026 |
| 1808 | OURAY UT 4-13 4-3-13-36-7HX | Duchesne County, UT | Oil & Gas Property | Jun 2026 |
| 1809 | OURAY VALLEY | Uintah County, UT | Oil & Gas Property | Jun 2026 |
| 1810 | OURAY VLY | Uintah County, UT | Oil & Gas Property | Jun 2026 |
| 1811 | OURSLER | Butler County, KS | Oil Property | Dec 2025 |
| 1812 | OUT OF YOUR ELEMENT | Wilson County, TX | Oil & Gas Property | Jun 2026 |
| 1813 | OUTER BLACKS FORK | Uinta County, WY | Oil & Gas Property | Jun 2026 |
| 1814 | OUTHIER | Blaine County, OK | Oil & Gas Property | Jun 2026 |
| 1815 | OUTHIER | Blaine County, OK | Oil & Gas Property | Jun 2026 |
| 1816 | OUTLAND 1 | Lea County, NM | Oil & Gas Property | Jul 2026 |
| 1817 | OUTLAND 14 23 STATE COM 2BS | Lea County, NM | Oil & Gas Property | Jul 2026 |
| 1818 | OUTLAND STATE UNIT | Lea County, NM | Oil & Gas Property | Jul 2026 |
| 1819 | OUTLAND WCA STATE UNIT 11 2 | Lea County, NM | Oil & Gas Property | Jul 2026 |
| 1820 | OUTLAW | Guernsey County, OH | Oil & Gas Property | Jun 2026 |
| 1821 | OUTLAW 22 FEDERAL COM | Lea County, NM | Oil & Gas Property | Jul 2026 |
| 1822 | OUTLAW 55-1-30 UNIT 1H | Loving County, TX | Oil & Gas Property | Jun 2026 |
| 1823 | OUTLAW FLATS | Eddy County, NM | Oil & Gas Property | Jun 2026 |
| 1824 | OUTLAW GAP | McKenzie County, ND | Oil & Gas Property | Jun 2026 |
| 1825 | OUTLAW STATE | Eddy County, NM | Oil & Gas Property | Jun 2026 |
| 1826 | OUTLOOK | Sheridan County, MT | Oil & Gas Property | Aug 1996 |
| 1827 | OUTRIDER | Lea County, NM | Oil & Gas Property | Jun 2026 |
| 1828 | OUTRIDER 27 FEDERAL COM | Lea County, NM | Oil & Gas Property | Jun 2026 |
| 1829 | OUTRIDER 28 FEDERAL COM | Lea County, NM | Oil & Gas Property | Jun 2026 |
| 1830 | OUTRIGGER | Campbell County, WY | Oil & Gas Property | Jul 2026 |
| 1831 | OUTTERSIDE A. J | Galveston County, TX | Oil & Gas Property | Jun 2026 |
| 1832 | OV UNIT | Dawson County, TX | Oil & Gas Property | Jun 2026 |
| 1833 | OVATION FEDERAL COM 1318 | Eddy County, NM | Oil & Gas Property | Jul 2026 |
| 1834 | OVER | Clarion County, PA | Gas Property | Dec 2025 |
| 1835 | OVER | Clarion County, PA | Oil & Gas Property | Dec 2025 |
| 1836 | OVER THE LINE | Wilson County, TX | Oil & Gas Property | Jun 2026 |
| 1837 | OVERACKER | Garfield County, CO | Oil & Gas Property | May 2026 |
| 1838 | OVERALL | Anderson County, KS | Oil Property | May 2026 |
| 1839 | OVERALL | Coleman County, TX | Oil & Gas Property | Jun 2026 |
| 1840 | OVERALL | Reno County, KS | Oil & Gas Property | May 2026 |
| 1841 | OVERBEY | Wichita County, TX | Oil & Gas Property | Jun 2026 |
| 1842 | OVERBEY 28-14 #1 | Conecuh County, AL | Oil & Gas Property | Jun 2026 |
| 1843 | OVERBROOK FEE | Campbell County, WY | Gas Property | May 2013 |
| 1844 | OVERBY | Wichita County, TX | Oil & Gas Property | Jun 2026 |
| 1845 | OVERBY | Toole County, MT | Gas Property | May 2026 |
| 1846 | OVERBY 15-1 | Conecuh County, AL | Oil & Gas Property | Jun 2026 |
| 1847 | OVERBY C. J | Karnes County, TX | Oil & Gas Property | Apr 2015 |
| 1848 | OVERBY GAS UNIT 2E | Bee County, TX | Oil & Gas Property | Jun 2026 |
| 1849 | OVERCASH | Throckmorton County, TX | Oil & Gas Property | May 2026 |
| 1850 | OVERDORF | Williams County, ND | Oil & Gas Property | Jun 2026 |
| 1851 | OVERFIELD | Henderson County, KY | Oil Property | Nov 2019 |
| 1852 | OVERFIELD | Henderson County, KY | Oil Property | Oct 2014 |
| 1853 | OVERHOLSER | Rooks County, KS | Oil Property | May 2026 |
| 1854 | OVERHOLT | Claiborne Parish, LA | Oil Property | Dec 2024 |
| 1855 | OVERLAND | Wagoner County, OK | Oil & Gas Property | Sep 2022 |
| 1856 | OVERLAND 1 | Burke County, ND | Oil & Gas Property | Jun 2026 |
| 1857 | OVERLAND 20-17-162-98H 4MD | Divide County, ND | Oil & Gas Property | Jun 2026 |
| 1858 | OVERLAND ANDERSON | Kern County, CA | Oil & Gas Property | Nov 2018 |
| 1859 | OVERLEE | Burke County, ND | Oil & Gas Property | Jun 2026 |
| 1860 | OVERLOOK | Weld County, CO | Oil & Gas Property | Dec 2024 |
| 1861 | OVERLOOK | Seminole County, OK | Oil & Gas Property | Dec 2012 |
| 1862 | OVERLOOK | Grady County, OK | Oil & Gas Property | Jun 2026 |
| 1863 | OVERLOOK DEV | Montgomery County, KS | Oil Property | Mar 2026 |
| 1864 | OVERLORD 21-56 | Midland County, TX | Oil & Gas Property | Jun 2026 |
| 1865 | OVERLORD 33 32 FEDERAL COM | Eddy County, NM | Oil & Gas Property | Jun 2026 |
| 1866 | OVERMAN | Kay County, OK | Oil & Gas Property | Aug 2023 |
| 1867 | OVERMYER | Ford County, KS | Oil & Gas Property | May 2026 |
| 1868 | OVERSHOWN GAS UNIT | Houston County, TX | Oil & Gas Property | Jun 2026 |
| 1869 | OVERSTREET | Haskell County, OK | Gas Property | Jun 2026 |
| 1870 | OVERSTREET | Le Flore County, OK | Gas Property | Feb 2016 |
| 1871 | OVERSTREET | Washita County, OK | Oil & Gas Property | Mar 2022 |
| 1872 | OVERSTREET | Cooke County, TX | Oil Property | Jun 2026 |
| 1873 | OVERSTREET | Seminole County, OK | Oil & Gas Property | Mar 2026 |
| 1874 | OVERTON | Garfield County, OK | Oil & Gas Property | May 2016 |
| 1875 | OVERTON | Smith County, TX | Oil & Gas Property | Jun 2026 |
| 1876 | OVERTON | Ritchie County, WV | Oil & Gas Property | Dec 2021 |
| 1877 | OVERTON | Beaver County, OK | Oil & Gas Property | Jun 2026 |
| 1878 | OVERTON | Logan County, OK | Oil & Gas Property | Jun 2026 |
| 1879 | OVERTON | Beaver County, OK | Oil & Gas Property | Jun 2026 |
| 1880 | OVERTON | Christian County, KY | Oil Property | Jul 2022 |
| 1881 | OVERTON | Beaver County, OK | Oil & Gas Property | Jun 2026 |
| 1882 | OVERTON | Dawson County, TX | Oil & Gas Property | Jun 2026 |
| 1883 | OVERTON | Glasscock County, TX | Oil & Gas Property | Jun 2026 |
| 1884 | OVERTON | Beaver County, OK | Oil & Gas Property | Jun 2026 |
| 1885 | OVERTON | Adams County, MS | Oil & Gas Property | Dec 2025 |
| 1886 | OVERTON BEN | Brown County, TX | Oil & Gas Property | Jun 2026 |
| 1887 | OVERTON G | Rusk County, TX | Oil & Gas Property | Jun 2026 |
| 1888 | OVERTON NE (PETTIT -A-) UNIT | Rusk County, TX | Oil & Gas Property | May 2026 |
| 1889 | OVIATT | Major County, OK | Oil & Gas Property | Jan 2006 |
| 1890 | OW PROPER | Elk County, PA | Gas Property | Dec 2025 |
| 1891 | OWAN 14B-22HN | Divide County, ND | Oil & Gas Property | Jun 2026 |
| 1892 | OWAN 23-26H | Williams County, ND | Oil & Gas Property | Jun 2026 |
| 1893 | OWAN 5402 43-26 | Williams County, ND | Oil & Gas Property | Jun 2026 |
| 1894 | OWASCO UNIT | Kimball County, NE | Oil Property | Dec 2025 |
| 1895 | OWC 0 | Los Angeles County, CA | Oil & Gas Property | Jul 2026 |
| 1896 | OWE 0 | Los Angeles County, CA | Oil & Gas Property | Jul 2026 |
| 1897 | OWEN | Uinta County, WY | Oil & Gas Property | Jun 2026 |
| 1898 | OWEN | San Juan County, NM | Oil & Gas Property | Jun 2026 |
| 1899 | OWEN | Logan County, KS | Oil Property | May 2026 |
| 1900 | OWEN | Stafford County, KS | Oil Property | Mar 1992 |