| 201 | CLAUGUS | Monroe County, OH | Oil & Gas Property | Mar 2025 |
| 202 | CLAUS | Monroe County, OH | Oil & Gas Property | Dec 2024 |
| 203 | CLAUSS-UNIT | Monroe County, OH | Oil & Gas Property | Dec 2024 |
| 204 | CLAY | Harrison County, OH | Oil & Gas Property | Mar 2025 |
| 205 | CLAY | Ashtabula County, OH | Oil & Gas Property | Dec 2024 |
| 206 | CLAY EAST UNIT 1H | Noble County, OH | Oil & Gas Property | Mar 2025 |
| 207 | CLAY UNIT 1H | Noble County, OH | Oil & Gas Property | Mar 2025 |
| 208 | CLAYCRAFT | Perry County, OH | Oil & Gas Property | Dec 2010 |
| 209 | CLAYPOOL | Licking County, OH | Oil Property | Dec 2022 |
| 210 | CLAYS PARK | Stark County, OH | Oil & Gas Property | Dec 2010 |
| 211 | CLAYTON B | Perry County, OH | Oil Property | Dec 2001 |
| 212 | CLEANERS HANG | Stark County, OH | Oil & Gas Property | Dec 2024 |
| 213 | CLEGG | Monroe County, OH | Oil Property | Dec 2024 |
| 214 | CLEMENS | Coshocton County, OH | Oil & Gas Property | Dec 2021 |
| 215 | CLEMENS BECKER | Noble County, OH | Oil & Gas Property | Dec 2024 |
| 216 | CLEVELAND | Wayne County, OH | Oil & Gas Property | Dec 2024 |
| 217 | CLEVELAND | Wayne County, OH | Oil & Gas Property | Dec 2024 |
| 218 | CLEVELAND B | Harrison County, OH | Oil & Gas Property | Dec 2024 |
| 219 | CLEVELAND BOY SCOUTS OF AMERICA | Lorain County, OH | Oil & Gas Property | Dec 2024 |
| 220 | CLEVELAND CATHOLIC | Medina County, OH | Oil & Gas Property | Dec 1995 |
| 221 | CLEVELAND HIGHLAND | Cuyahoga County, OH | Oil & Gas Property | Dec 2024 |
| 222 | CLEVELAND METROP | Medina County, OH | Oil & Gas Property | Dec 2024 |
| 223 | CLEVELAND QUARRIES | Erie County, OH | Oil & Gas Property | Dec 2024 |
| 224 | CLEVELAND/SENECA GOLF COURSE | Cuyahoga County, OH | Oil & Gas Property | Dec 2024 |
| 225 | CLIFFORD CHANEY | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 226 | CLINE | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 227 | CLINE | Monroe County, OH | Oil & Gas Property | Dec 2024 |
| 228 | CLINE | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 229 | CLINE | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 230 | CLINE | Licking County, OH | Oil & Gas Property | Dec 2024 |
| 231 | CLINE | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 232 | CLINE DAV | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 233 | CLINE LUTHER (WOOL MICHAEL) | Monroe County, OH | Oil & Gas Property | Dec 2016 |
| 234 | CLINGER | Morrow County, OH | Oil Property | Dec 2011 |
| 235 | CLINTON OIL | Ashtabula County, OH | Oil & Gas Property | Dec 2015 |
| 236 | CLINTON SLAUGHTER | Muskingum County, OH | Oil & Gas Property | Dec 2013 |
| 237 | CLOSE | Holmes County, OH | Oil & Gas Property | Dec 2024 |
| 238 | CLOSE | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 239 | CLOUSE | Perry County, OH | Oil & Gas Property | Dec 2022 |
| 240 | CLUB NE SMF JF | Jefferson County, OH | Gas Property | Mar 2025 |
| 241 | CLUB NW SMF JF | Jefferson County, OH | Gas Property | Mar 2025 |
| 242 | CLUB SE SMF JF 8H | Jefferson County, OH | Gas Property | Mar 2025 |
| 243 | CLUTTER | Knox County, OH | Oil & Gas Property | Dec 2023 |
| 244 | CLYDE HENDERSON | Perry County, OH | Oil & Gas Property | Dec 2014 |
| 245 | CNGD-ABRAMS | Geauga County, OH | Oil & Gas Property | Dec 2008 |
| 246 | CNX UNIT OH121000 | Noble County, OH | Oil & Gas Property | Dec 2021 |
| 247 | COAD OXF GR | Guernsey County, OH | Oil & Gas Property | Mar 2025 |
| 248 | COAKLEY | Hocking County, OH | Oil & Gas Property | Dec 2023 |
| 249 | COAL UNIT | Noble County, OH | Oil & Gas Property | Mar 2025 |
| 250 | COBLE | Perry County, OH | Oil & Gas Property | Dec 2018 |
| 251 | COBLE FLORENCE | Perry County, OH | Oil Property | Dec 2022 |
| 252 | COBLENTZ | Holmes County, OH | Oil & Gas Property | Dec 2022 |
| 253 | COBLENTZ | Holmes County, OH | Oil & Gas Property | Dec 2022 |
| 254 | COBRA CDZ HR | Harrison County, OH | Oil & Gas Property | Mar 2025 |
| 255 | COCHE | Perry County, OH | Oil & Gas Property | Dec 2002 |
| 256 | COCHRAN | Licking County, OH | Oil Property | Dec 2016 |
| 257 | COCHRELL | Wayne County, OH | Oil & Gas Property | Dec 2024 |
| 258 | COCKS P B | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 259 | COE 34-12-4 | Carroll County, OH | Oil & Gas Property | Mar 2025 |
| 260 | COFFEY | Athens County, OH | Oil & Gas Property | Dec 2023 |
| 261 | COFFIELD | Belmont County, OH | Gas Property | Mar 2025 |
| 262 | COFFMAN CLARENCE | Washington County, OH | Oil & Gas Property | Dec 2019 |
| 263 | COFFMAN FARMS | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 264 | COLAIANNI | Jefferson County, OH | Gas Property | Mar 2025 |
| 265 | COLBURN | Athens County, OH | Oil & Gas Property | Dec 2023 |
| 266 | COLE | Guernsey County, OH | Oil & Gas Property | Mar 2025 |
| 267 | COLE-KAESGEN | Holmes County, OH | Oil & Gas Property | Dec 2007 |
| 268 | COLEMAN RCH BL | Belmont County, OH | Gas Property | Mar 2025 |
| 269 | COLESCOTT 11-12-5 | Carroll County, OH | Oil & Gas Property | Mar 2025 |
| 270 | COLLECTORS S NTG HR | Harrison County, OH | Oil & Gas Property | Mar 2025 |
| 271 | COLLECTORS TRIANGLE S U | Monroe County, OH | Gas Property | Mar 2025 |
| 272 | COLLINS | Jefferson County, OH | Gas Property | Mar 2025 |
| 273 | COLLINS | Guernsey County, OH | Oil & Gas Property | Dec 2022 |
| 274 | COLLINS | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 275 | COLOPY | Knox County, OH | Oil & Gas Property | Dec 2023 |
| 276 | COLOPY | Knox County, OH | Oil & Gas Property | Dec 2024 |
| 277 | COLOPY WILFORD | Knox County, OH | Oil & Gas Property | Dec 1995 |
| 278 | COLUMBIA | Lorain County, OH | Oil & Gas Property | Dec 2021 |
| 279 | COLUMBIA CEMENT | Muskingum County, OH | Oil & Gas Property | Dec 2024 |
| 280 | COLUMBIA FIRE BRICK CO | Tuscarawas County, OH | Gas Property | Dec 2024 |
| 281 | COLUMBIA GAS TRANSMISSION | Hocking County, OH | Oil & Gas Property | Dec 2005 |
| 282 | COLUMBUS B | Hocking County, OH | Oil & Gas Property | Dec 2023 |
| 283 | COLUMBUS S | Muskingum County, OH | Oil & Gas Property | Dec 2024 |
| 284 | COLUMBUS SOUTHER | Muskingum County, OH | Oil & Gas Property | Dec 2024 |
| 285 | COLVILLE | Licking County, OH | Oil & Gas Property | Dec 2001 |
| 286 | COLVIN | Monroe County, OH | Oil & Gas Property | Dec 2024 |
| 287 | COMBS | Morgan County, OH | Oil & Gas Property | Dec 2024 |
| 288 | COMFORT | Stark County, OH | Oil & Gas Property | Dec 2024 |
| 289 | COMMISSIONERS | Guernsey County, OH | Oil & Gas Property | Mar 2025 |
| 290 | COMMISSIONERS | Summit County, OH | Oil & Gas Property | Dec 2018 |
| 291 | COMMUNITY IMPROVEMENT CORP | Mahoning County, OH | Oil & Gas Property | Dec 2024 |
| 292 | COMP | Ashtabula County, OH | Oil & Gas Property | Dec 2024 |
| 293 | COMPSON DANIEL | Monroe County, OH | Oil Property | Dec 2024 |
| 294 | COMSTOCK | Morrow County, OH | Oil & Gas Property | Dec 2024 |
| 295 | CONARD | Coshocton County, OH | Oil Property | Dec 2024 |
| 296 | CONE/HEMPHILL | Lake County, OH | Oil & Gas Property | Dec 2024 |
| 297 | CONGER | Licking County, OH | Oil Property | Dec 2024 |
| 298 | CONGLETON | Washington County, OH | Oil & Gas Property | Dec 2024 |
| 299 | CONIGLIO 7-14-4 | Carroll County, OH | Oil & Gas Property | Mar 2025 |
| 300 | CONKLE | Coshocton County, OH | Oil & Gas Property | Dec 2024 |