| 301 | CONOTTON | Carroll County, OH | Oil & Gas Property | Dec 2023 |
| 302 | CONOTTON LAND | Tuscarawas County, OH | Oil & Gas Property | Dec 2025 |
| 303 | CONOTTON LAND | Harrison County, OH | Oil & Gas Property | Dec 2025 |
| 304 | CONOTTON LAND CO | Tuscarawas County, OH | Oil & Gas Property | Dec 2025 |
| 305 | CONRAD | Wayne County, OH | Oil & Gas Property | Dec 2025 |
| 306 | CONRAD | Licking County, OH | Oil & Gas Property | Dec 2025 |
| 307 | CONRAD | Licking County, OH | Oil Property | Dec 1989 |
| 308 | CONRAD CG | Coshocton County, OH | Oil & Gas Property | Dec 2025 |
| 309 | CONRAIL | Trumbull County, OH | Oil & Gas Property | Dec 2025 |
| 310 | CONRAIL | Trumbull County, OH | Oil & Gas Property | Dec 2025 |
| 311 | CONSERVATION LEAGUE | Trumbull County, OH | Oil & Gas Property | Dec 2025 |
| 312 | CONSOL | Muskingum County, OH | Oil & Gas Property | Dec 2025 |
| 313 | CONSOL C | Muskingum County, OH | Oil & Gas Property | Dec 2025 |
| 314 | CONSOL MINING COMPANY LLC SWITZ27 | Monroe County, OH | Gas Property | Jun 2026 |
| 315 | CONSOLIDATED COAL | Muskingum County, OH | Oil & Gas Property | Dec 2025 |
| 316 | CONSOLIDATED FREIGHTWAYS | Summit County, OH | Oil & Gas Property | Dec 2020 |
| 317 | CONSOLIDATION CO | Muskingum County, OH | Oil & Gas Property | Dec 2025 |
| 318 | CONSOLIDATION COAL | Muskingum County, OH | Oil & Gas Property | Dec 2025 |
| 319 | CONSOLIDATION COAL C | Muskingum County, OH | Oil & Gas Property | Dec 2025 |
| 320 | CONSOLIDATION COAL CO | Noble County, OH | Oil & Gas Property | Dec 2025 |
| 321 | CONSOLIDATION COAL CO | Noble County, OH | Oil & Gas Property | Dec 2025 |
| 322 | CONST | Washington County, OH | Oil & Gas Property | Dec 2025 |
| 323 | CONSTITUTION | Washington County, OH | Oil & Gas Property | Dec 2025 |
| 324 | CONSUMER | Trumbull County, OH | Oil & Gas Property | Dec 2025 |
| 325 | CONWAY 21 | Belmont County, OH | Gas Property | Jun 2026 |
| 326 | COOK | Morgan County, OH | Oil & Gas Property | Dec 2022 |
| 327 | COOK ELTON & ELSIE | Meigs County, OH | Oil & Gas Property | Dec 1997 |
| 328 | COOK H | Meigs County, OH | Oil & Gas Property | Dec 2024 |
| 329 | COOK LORNA | Athens County, OH | Oil & Gas Property | Dec 2022 |
| 330 | COOK S RCH BL 4H | Belmont County, OH | Gas Property | Jun 2026 |
| 331 | COOK UNIT | Belmont County, OH | Gas Property | Jun 2026 |
| 332 | COOKSON | Perry County, OH | Oil & Gas Property | Dec 2025 |
| 333 | COOLEY | Portage County, OH | Oil & Gas Property | Dec 2025 |
| 334 | COOMER J | Perry County, OH | Oil & Gas Property | Dec 2013 |
| 335 | COOPER | Perry County, OH | Oil & Gas Property | Dec 2003 |
| 336 | COOPER 8-13-5 | Carroll County, OH | Oil & Gas Property | Jun 2026 |
| 337 | COOPERIDER | Perry County, OH | Oil & Gas Property | Dec 1994 |
| 338 | COOPERRIDER | Perry County, OH | Oil & Gas Property | Dec 2024 |
| 339 | COOPERRIDER | Licking County, OH | Oil Property | Dec 2025 |
| 340 | COPELAND | Athens County, OH | Oil Property | Dec 2025 |
| 341 | COPELAND OAKS | Mahoning County, OH | Oil & Gas Property | Dec 2025 |
| 342 | COPPERWELD | Trumbull County, OH | Oil & Gas Property | Dec 2025 |
| 343 | CORBETT | Wayne County, OH | Oil & Gas Property | Dec 2025 |
| 344 | CORBETT | Washington County, OH | Oil & Gas Property | Dec 2025 |
| 345 | CORBETT M | Perry County, OH | Oil Property | Dec 2024 |
| 346 | CORDER E NTG HR | Harrison County, OH | Oil & Gas Property | Jun 2026 |
| 347 | CORDER W NTG HR | Harrison County, OH | Oil & Gas Property | Jun 2026 |
| 348 | CORDRAY | Morgan County, OH | Oil & Gas Property | Dec 2023 |
| 349 | CORETTA BIGGS | Knox County, OH | Oil & Gas Property | Dec 2025 |
| 350 | CORNELIUS | Guernsey County, OH | Oil & Gas Property | Dec 2025 |
| 351 | CORNELL | Wayne County, OH | Oil & Gas Property | Dec 2025 |
| 352 | CORNING MINING CO | Perry County, OH | Oil Property | Dec 2012 |
| 353 | CORRELL | Stark County, OH | Oil & Gas Property | Dec 2025 |
| 354 | COSHOCTON COUNTY AIRPORT AUTHORITY | Coshocton County, OH | Oil & Gas Property | Dec 2025 |
| 355 | COSTANZO | Summit County, OH | Oil & Gas Property | Dec 1994 |
| 356 | COTTERMAN | Ashtabula County, OH | Oil & Gas Property | Dec 2017 |
| 357 | COTTERMAN | Perry County, OH | Oil & Gas Property | Dec 2025 |
| 358 | COTTERMAN | Perry County, OH | Oil & Gas Property | Dec 1988 |
| 359 | COTTERMAN | Perry County, OH | Oil & Gas Property | Dec 2025 |
| 360 | COULTER | Licking County, OH | Oil & Gas Property | Dec 1987 |
| 361 | COULTER | Perry County, OH | Oil & Gas Property | Dec 2012 |
| 362 | COUNTY INFIRMARY | Morgan County, OH | Oil & Gas Property | Dec 2025 |
| 363 | COURTNEY | Mahoning County, OH | Oil & Gas Property | Dec 2025 |
| 364 | COVERT | Monroe County, OH | Oil & Gas Property | Dec 2025 |
| 365 | COWEN ETAL | Monroe County, OH | Oil & Gas Property | Dec 2025 |
| 366 | COWGILL | Guernsey County, OH | Oil & Gas Property | Dec 2022 |
| 367 | COX GRAVEL | Muskingum County, OH | Oil & Gas Property | Dec 2025 |
| 368 | COYOTE | Monroe County, OH | Gas Property | Jun 2026 |
| 369 | CRAIG MILLER | Monroe County, OH | Gas Property | Jun 2026 |
| 370 | CRAIG R | Guernsey County, OH | Oil & Gas Property | Dec 1993 |
| 371 | CRANE | Portage County, OH | Oil & Gas Property | Dec 2025 |
| 372 | CRAVAT COAL | Harrison County, OH | Gas Property | Jun 2026 |
| 373 | CRAVAT N WHL BL | Belmont County, OH | Gas Property | Jun 2026 |
| 374 | CRAVAT S WHL BL | Belmont County, OH | Gas Property | Jun 2026 |
| 375 | CRAWFORD | Muskingum County, OH | Oil & Gas Property | Dec 2025 |
| 376 | CRAWFORD | Coshocton County, OH | Oil & Gas Property | Dec 2025 |
| 377 | CRAWFORD | Monroe County, OH | Gas Property | Jun 2026 |
| 378 | CRAWFORD | Jefferson County, OH | Oil & Gas Property | Jun 2026 |
| 379 | CRAWFORD | Muskingum County, OH | Oil Property | Dec 2025 |
| 380 | CRAWMER | Licking County, OH | Oil & Gas Property | Dec 2025 |
| 381 | CREAMER | Jefferson County, OH | Gas Property | Jun 2026 |
| 382 | CREE | Monroe County, OH | Oil & Gas Property | Dec 2025 |
| 383 | CREIGHTON | Tuscarawas County, OH | Oil & Gas Property | Dec 2025 |
| 384 | CREIGHTON | Stark County, OH | Oil & Gas Property | Dec 2025 |
| 385 | CRESTONE | Monroe County, OH | Oil & Gas Property | Jun 2026 |
| 386 | CRESTONE-HARRISON 2HU | Monroe County, OH | Oil & Gas Property | Jun 2026 |
| 387 | CREW | Trumbull County, OH | Oil & Gas Property | Dec 2025 |
| 388 | CRICKET | Harrison County, OH | Gas Property | Jun 2026 |
| 389 | CRIDER | Holmes County, OH | Oil & Gas Property | Dec 2024 |
| 390 | CRIDER | Holmes County, OH | Oil & Gas Property | Dec 2025 |
| 391 | CRILOW | Stark County, OH | Oil & Gas Property | Dec 2025 |
| 392 | CRILOW | Holmes County, OH | Oil & Gas Property | Dec 2025 |
| 393 | CRISLIP | Guernsey County, OH | Oil & Gas Property | Dec 2016 |
| 394 | CROCK | Noble County, OH | Oil & Gas Property | Dec 2022 |
| 395 | CROCK | Noble County, OH | Oil & Gas Property | Dec 2024 |
| 396 | CROCKER | Medina County, OH | Oil & Gas Property | Dec 2024 |
| 397 | CROMIKA 34-10-5 | Harrison County, OH | Oil & Gas Property | Jun 2026 |
| 398 | CRONIN | Monroe County, OH | Oil & Gas Property | Dec 2024 |
| 399 | CROSBY | Ashtabula County, OH | Oil & Gas Property | Dec 2023 |
| 400 | CROSKEY | Holmes County, OH | Oil & Gas Property | Dec 2022 |