| 1901 | DONALD SHIREY | Clarion County, PA | Gas Property | Dec 2025 |
| 1902 | DONALD STREAMS | Indiana County, PA | Gas Property | Dec 2025 |
| 1903 | DONALD STROUP | Armstrong County, PA | Gas Property | Dec 2025 |
| 1904 | DONALD W DEITZ | Clarion County, PA | Oil & Gas Property | Dec 2024 |
| 1905 | DONALD W STREAMS | Indiana County, PA | Gas Property | Dec 2024 |
| 1906 | DONEY | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 1907 | DONLEY | Greene County, PA | Oil & Gas Property | Dec 2025 |
| 1908 | DONNA | Bradford County, PA | Gas Property | Dec 2025 |
| 1909 | DONNA CLARE DC | Forest County, PA | Oil & Gas Property | Dec 2025 |
| 1910 | DONOVAN OR STEWART RUN CLUB | Venango County, PA | Oil Property | Dec 2025 |
| 1911 | DONOVAN STEWART RUN CLUB | Venango County, PA | Oil Property | Dec 2025 |
| 1912 | DORADO | Butler County, PA | Gas Property | Dec 2025 |
| 1913 | DORAZIO | Fayette County, PA | Gas Property | Dec 2025 |
| 1914 | DORN (02-180 | Tioga County, PA | Gas Property | Dec 2025 |
| 1915 | DOROTHEA TAYLOR T | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 1916 | DOROTHY MCNAUGHTON | Indiana County, PA | Gas Property | Dec 2025 |
| 1917 | DORSCH UNIT | Butler County, PA | Oil & Gas Property | Dec 2025 |
| 1918 | DOSS | Bradford County, PA | Gas Property | Dec 2025 |
| 1919 | DOTTS | Clearfield County, PA | Gas Property | Dec 2025 |
| 1920 | DOTY | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 1921 | DOUGHERTY | Clarion County, PA | Oil & Gas Property | Dec 2025 |
| 1922 | DOUGHERTY HEIRS | Clarion County, PA | Gas Property | Dec 2025 |
| 1923 | DOUGLAS BIEDA | Westmoreland County, PA | Gas Property | Dec 2025 |
| 1924 | DOUGLAS E. BIEDA | Indiana County, PA | Gas Property | Dec 2025 |
| 1925 | DOUGLAS G MINICH | Clarion County, PA | Gas Property | Dec 2025 |
| 1926 | DOUGLAS HEIRS | Indiana County, PA | Gas Property | Dec 2025 |
| 1927 | DOUGLAS MINICH | Clarion County, PA | Gas Property | Dec 2025 |
| 1928 | DOUTHIT 00 | Jefferson County, PA | Gas Property | Dec 2025 |
| 1929 | DOVEN SPIKE | Clarion County, PA | Oil & Gas Property | Dec 2020 |
| 1930 | DOVERSPIKE | Jefferson County, PA | Gas Property | Dec 2025 |
| 1931 | DOVERSPIKE | Armstrong County, PA | Gas Property | Dec 2025 |
| 1932 | DOVERSPIKE EBERLE 00 | Armstrong County, PA | Gas Property | Dec 2025 |
| 1933 | DPH NE 1H | Wyoming County, PA | Gas Property | Dec 2025 |
| 1934 | DPH NW | Wyoming County, PA | Gas Property | Dec 2025 |
| 1935 | DPH SE | Wyoming County, PA | Gas Property | Dec 2025 |
| 1936 | DPH SW | Wyoming County, PA | Gas Property | Dec 2025 |
| 1937 | DR C M SMITH | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 1938 | DR02 WT5201 CP | Forest County, PA | Oil & Gas Property | Dec 2025 |
| 1939 | DRACO | Butler County, PA | Gas Property | Dec 2025 |
| 1940 | DRAGON CHAN | Greene County, PA | Gas Property | Dec 2025 |
| 1941 | DRAKE | Butler County, PA | Gas Property | Dec 2025 |
| 1942 | DRAKE | Bradford County, PA | Gas Property | Dec 2025 |
| 1943 | DRAKULIC | Allegheny County, PA | Gas Property | Dec 2025 |
| 1944 | DRANN | Susquehanna County, PA | Gas Property | Dec 2025 |
| 1945 | DRAPE JAMES 18118 | Allegheny County, PA | Gas Property | Dec 2025 |
| 1946 | DRAYER | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 1947 | DREHER A UNIT | Butler County, PA | Gas Property | Dec 2025 |
| 1948 | DREHER B UNIT | Butler County, PA | Oil & Gas Property | Dec 2025 |
| 1949 | DREW KIMMEL | Armstrong County, PA | Gas Property | Dec 2025 |
| 1950 | DRIFT RIDGE | Greene County, PA | Gas Property | Dec 2025 |
| 1951 | DRISCOLL | Bradford County, PA | Gas Property | Dec 2025 |
| 1952 | DROP | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 1953 | DROPP | Susquehanna County, PA | Gas Property | Dec 2025 |
| 1954 | DRUGGAN | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 1955 | DRUGMAND UNIT | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 1956 | DRUSHEL UNIT | Butler County, PA | Oil & Gas Property | Dec 2025 |
| 1957 | DU3 6 1H | Jefferson County, PA | Gas Property | Dec 2025 |
| 1958 | DUANE | Bradford County, PA | Gas Property | Dec 2025 |
| 1959 | DUBOIS 3 | Clearfield County, PA | Oil & Gas Property | Dec 2025 |
| 1960 | DUCHESS 00 | Westmoreland County, PA | Gas Property | Dec 2025 |
| 1961 | DUCK HOLLOW | Fayette County, PA | Gas Property | Dec 2024 |
| 1962 | DUFF | Westmoreland County, PA | Gas Property | Dec 2025 |
| 1963 | DUFFIELD | Bradford County, PA | Gas Property | Dec 2025 |
| 1964 | DUFFY ESTATE D | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 1965 | DUHRING | Forest County, PA | Oil & Gas Property | Dec 2025 |
| 1966 | DULCEY BRA | Bradford County, PA | Gas Property | Dec 2025 |
| 1967 | DUNCAN FORK | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 1968 | DUNHAM | Bradford County, PA | Gas Property | Dec 2025 |
| 1969 | DUNLAP | Indiana County, PA | Gas Property | Dec 2025 |
| 1970 | DUNLAP-BARNETT UNIT | Clearfield County, PA | Gas Property | Dec 2025 |
| 1971 | DUNMIRE UNIT | Butler County, PA | Gas Property | Dec 2025 |
| 1972 | DUNN | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 1973 | DUNN | Forest County, PA | Oil & Gas Property | Dec 2025 |
| 1974 | DUNN CLINGERMAN UNIT | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 1975 | DUNN JOHN UNIT | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 1976 | DUNNY | Wyoming County, PA | Gas Property | Dec 2025 |
| 1977 | DUNSHIE D | Potter County, PA | Gas Property | Dec 2024 |
| 1978 | DUQUESNE LIGHT CO | Allegheny County, PA | Oil & Gas Property | Dec 2025 |
| 1979 | DURALIA 1 | Westmoreland County, PA | Gas Property | Dec 2025 |
| 1980 | DURBIN 00 | Clearfield County, PA | Gas Property | Dec 2025 |
| 1981 | DURKACS UNIT | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 1982 | DURY | Washington County, PA | Gas Property | Dec 2025 |
| 1983 | DUSENBURY-WHEELER & MERSEREAU | Potter County, PA | Oil & Gas Property | Dec 2024 |
| 1984 | DUTTER | McKean County, PA | Oil & Gas Property | Dec 2025 |
| 1985 | DWAINE & PENNI GARANSI | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 1986 | DWIGHT E BARKLEY | Indiana County, PA | Gas Property | Dec 2025 |
| 1987 | DWIGHT MCKIN | Armstrong County, PA | Gas Property | Dec 2025 |
| 1988 | DYDA UNIT | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 1989 | DYGERT | Crawford County, PA | Oil & Gas Property | Dec 2025 |
| 1990 | DYNAMITE | Armstrong County, PA | Gas Property | Dec 2025 |
| 1991 | DYNYS | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 1992 | DYSON W | Susquehanna County, PA | Gas Property | Dec 2025 |
| 1993 | DZIUBA | Bradford County, PA | Gas Property | Dec 2025 |
| 1994 | E & F SMITH | Crawford County, PA | Gas Property | Dec 2013 |
| 1995 | E A JOHNSON | McKean County, PA | Oil & Gas Property | Dec 2025 |
| 1996 | E B BRANDON | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 1997 | E B WRIGHT | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 1998 | E BUNNELL | Susquehanna County, PA | Gas Property | Dec 2025 |
| 1999 | E C BEST | Armstrong County, PA | Gas Property | Dec 2025 |
| 2000 | E CHARLES HERRICK | Crawford County, PA | Gas Property | Dec 2025 |