| 1001 | CLEVELAND HIGHLAND | Cuyahoga County, OH | Oil & Gas Property | Dec 2023 |
| 1002 | CLEVELAND METROP | Medina County, OH | Oil & Gas Property | Dec 2023 |
| 1003 | CLEVELAND QUARRIES | Erie County, OH | Oil & Gas Property | Dec 2023 |
| 1004 | CLEVELAND/SENECA GOLF COURSE | Cuyahoga County, OH | Oil & Gas Property | Dec 2023 |
| 1005 | CLIFFORD CHANEY | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 1006 | CLINE | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 1007 | CLINE | Monroe County, OH | Oil & Gas Property | Dec 2023 |
| 1008 | CLINE | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 1009 | CLINE | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 1010 | CLINE | Licking County, OH | Oil & Gas Property | Dec 2023 |
| 1011 | CLINE | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 1012 | CLINE DAV | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 1013 | CLINE LUTHER (WOOL MICHAEL) | Monroe County, OH | Oil & Gas Property | Dec 2016 |
| 1014 | CLINGER | Morrow County, OH | Oil Property | Dec 2011 |
| 1015 | CLINTON OIL | Ashtabula County, OH | Oil & Gas Property | Dec 2015 |
| 1016 | CLINTON SLAUGHTER | Muskingum County, OH | Oil & Gas Property | Dec 2013 |
| 1017 | CLOSE | Holmes County, OH | Oil & Gas Property | Dec 2023 |
| 1018 | CLOSE | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 1019 | CLOUSE | Perry County, OH | Oil & Gas Property | Dec 2022 |
| 1020 | CLUB NE SMF JF | Jefferson County, OH | Gas Property | Dec 2024 |
| 1021 | CLUB NW SMF JF | Jefferson County, OH | Gas Property | Dec 2024 |
| 1022 | CLUB SE SMF JF 8H | Jefferson County, OH | Gas Property | Dec 2024 |
| 1023 | CLUTTER | Knox County, OH | Oil & Gas Property | Dec 2023 |
| 1024 | CLYDE HENDERSON | Perry County, OH | Oil & Gas Property | Dec 2014 |
| 1025 | CNGD-ABRAMS | Geauga County, OH | Oil & Gas Property | Dec 2008 |
| 1026 | CNX UNIT OH121000 | Noble County, OH | Oil & Gas Property | Dec 2021 |
| 1027 | COAD OXF GR | Guernsey County, OH | Oil & Gas Property | Dec 2024 |
| 1028 | COAKLEY | Hocking County, OH | Oil & Gas Property | Dec 2022 |
| 1029 | COAL UNIT | Noble County, OH | Oil & Gas Property | Dec 2024 |
| 1030 | COBLE | Perry County, OH | Oil & Gas Property | Dec 2018 |
| 1031 | COBLE FLORENCE | Perry County, OH | Oil Property | Dec 2022 |
| 1032 | COBLENTZ | Holmes County, OH | Oil & Gas Property | Dec 2022 |
| 1033 | COBLENTZ | Holmes County, OH | Oil & Gas Property | Dec 2022 |
| 1034 | COBRA CDZ HR | Harrison County, OH | Oil & Gas Property | Dec 2024 |
| 1035 | COCHE | Perry County, OH | Oil & Gas Property | Dec 2002 |
| 1036 | COCHRAN | Licking County, OH | Oil Property | Dec 2016 |
| 1037 | COCHRELL | Wayne County, OH | Oil & Gas Property | Dec 2024 |
| 1038 | COCKS P B | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 1039 | COE 34-12-4 | Carroll County, OH | Oil & Gas Property | Dec 2024 |
| 1040 | COFFEY | Athens County, OH | Oil & Gas Property | Dec 2023 |
| 1041 | COFFIELD | Belmont County, OH | Gas Property | Dec 2024 |
| 1042 | COFFMAN CLARENCE | Washington County, OH | Oil & Gas Property | Dec 2019 |
| 1043 | COFFMAN FARMS | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 1044 | COLAIANNI | Jefferson County, OH | Gas Property | Dec 2024 |
| 1045 | COLBURN | Athens County, OH | Oil & Gas Property | Dec 2023 |
| 1046 | COLE | Guernsey County, OH | Oil & Gas Property | Dec 2024 |
| 1047 | COLE-KAESGEN | Holmes County, OH | Oil & Gas Property | Dec 2007 |
| 1048 | COLEMAN RCH BL | Belmont County, OH | Gas Property | Dec 2024 |
| 1049 | COLESCOTT 11-12-5 | Carroll County, OH | Oil & Gas Property | Dec 2024 |
| 1050 | COLLECTORS S NTG HR | Harrison County, OH | Oil & Gas Property | Dec 2024 |
| 1051 | COLLECTORS TRIANGLE S U | Monroe County, OH | Gas Property | Dec 2024 |
| 1052 | COLLINS | Jefferson County, OH | Gas Property | Dec 2024 |
| 1053 | COLLINS | Guernsey County, OH | Oil & Gas Property | Dec 2022 |
| 1054 | COLLINS | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 1055 | COLOPY | Knox County, OH | Oil & Gas Property | Dec 2023 |
| 1056 | COLOPY | Knox County, OH | Oil & Gas Property | Dec 2023 |
| 1057 | COLOPY WILFORD | Knox County, OH | Oil & Gas Property | Dec 1995 |
| 1058 | COLUMBIA | Lorain County, OH | Oil & Gas Property | Dec 2021 |
| 1059 | COLUMBIA CEMENT | Muskingum County, OH | Oil & Gas Property | Dec 2024 |
| 1060 | COLUMBIA FIRE BRICK CO | Tuscarawas County, OH | Gas Property | Dec 2024 |
| 1061 | COLUMBIA GAS TRANSMISSION | Hocking County, OH | Oil & Gas Property | Dec 2005 |
| 1062 | COLUMBUS B | Hocking County, OH | Oil & Gas Property | Dec 2022 |
| 1063 | COLUMBUS S | Muskingum County, OH | Oil & Gas Property | Dec 2024 |
| 1064 | COLUMBUS SOUTHER | Muskingum County, OH | Oil & Gas Property | Dec 2024 |
| 1065 | COLVILLE | Licking County, OH | Oil & Gas Property | Dec 2001 |
| 1066 | COLVIN | Monroe County, OH | Oil & Gas Property | Dec 2024 |
| 1067 | COMBS | Morgan County, OH | Oil & Gas Property | Dec 2021 |
| 1068 | COMFORT | Stark County, OH | Oil & Gas Property | Dec 2023 |
| 1069 | COMMISSIONERS | Guernsey County, OH | Oil & Gas Property | Dec 2024 |
| 1070 | COMMISSIONERS | Summit County, OH | Oil & Gas Property | Dec 2018 |
| 1071 | COMMUNITY IMPROVEMENT CORP | Mahoning County, OH | Oil & Gas Property | Dec 2024 |
| 1072 | COMP | Ashtabula County, OH | Oil & Gas Property | Dec 2023 |
| 1073 | COMSTOCK | Morrow County, OH | Oil & Gas Property | Dec 2024 |
| 1074 | CONARD | Coshocton County, OH | Oil Property | Dec 2023 |
| 1075 | CONE/HEMPHILL | Lake County, OH | Oil & Gas Property | Dec 2023 |
| 1076 | CONGER | Licking County, OH | Oil Property | Dec 2023 |
| 1077 | CONGLETON | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 1078 | CONIGLIO 7-14-4 | Carroll County, OH | Oil & Gas Property | Dec 2024 |
| 1079 | CONKLE | Coshocton County, OH | Oil & Gas Property | Dec 2023 |
| 1080 | CONKLE | Hocking County, OH | Oil & Gas Property | Dec 2023 |
| 1081 | CONKLE C | Coshocton County, OH | Oil & Gas Property | Dec 2023 |
| 1082 | CONKLE JOHN | Coshocton County, OH | Oil & Gas Property | Dec 2023 |
| 1083 | CONKLIN 34-13-7 4 | Tuscarawas County, OH | Oil & Gas Property | Dec 2024 |
| 1084 | CONLEY DENVER & BONNIE | Medina County, OH | Oil & Gas Property | Dec 2007 |
| 1085 | CONNEAUT | Ashtabula County, OH | Oil & Gas Property | Dec 2023 |
| 1086 | CONNIE JO | Belmont County, OH | Gas Property | Dec 2024 |
| 1087 | CONOTTON | Carroll County, OH | Oil & Gas Property | Dec 2023 |
| 1088 | CONOTTON LAND | Tuscarawas County, OH | Oil & Gas Property | Dec 2024 |
| 1089 | CONOTTON LAND | Harrison County, OH | Oil & Gas Property | Dec 2024 |
| 1090 | CONOTTON LAND CO | Tuscarawas County, OH | Oil & Gas Property | Dec 2023 |
| 1091 | CONRAD | Wayne County, OH | Oil & Gas Property | Dec 2024 |
| 1092 | CONRAD | Licking County, OH | Oil & Gas Property | Dec 2023 |
| 1093 | CONRAD | Licking County, OH | Oil Property | Dec 1989 |
| 1094 | CONRAD CG | Coshocton County, OH | Oil & Gas Property | Dec 2023 |
| 1095 | CONRAIL | Trumbull County, OH | Oil & Gas Property | Dec 2024 |
| 1096 | CONRAIL | Trumbull County, OH | Oil & Gas Property | Dec 2024 |
| 1097 | CONSERVATION LEAGUE | Trumbull County, OH | Oil & Gas Property | Dec 2023 |
| 1098 | CONSOL | Muskingum County, OH | Oil & Gas Property | Dec 2023 |
| 1099 | CONSOL C | Muskingum County, OH | Oil & Gas Property | Dec 2023 |
| 1100 | CONSOL MINING COMPANY LLC SWITZ27 | Monroe County, OH | Gas Property | Dec 2024 |