| 301 | Derby Oil & Gas Corp | Cumberland, OH 43732 | Oil & Gas Operator | Dec 1986 |
| 302 | Derby Operating Corp | Wooster, OH 44691 | Oil & Gas Operator | Dec 2017 |
| 303 | Derrick Petroleum Inc | Bladensburg, OH 43005 | Oil & Gas Operator | Dec 2017 |
| 304 | Desco Corp | Columbus, OH 43085 | Oil & Gas Operator | Dec 1989 |
| 305 | Dever Lavon B | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2012 |
| 306 | Dever Linda K | Norwalk, OH 43767 | Oil & Gas Operator | Dec 2017 |
| 307 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2019 |
| 308 | Devon Petroleum Corp. | Marietta, OH 45750 | Oil & Gas Operator | Dec 1996 |
| 309 | Devore Anthony D | Gambier, OH 43022 | Oil & Gas Operator | Dec 2010 |
| 310 | Diamond Oil Co | Lancaster, OH 43130 | Oil & Gas Operator | Dec 1992 |
| 311 | Diamond Shamrock Chem Co | Irving, TX 75061 | Oil & Gas Operator | Dec 1990 |
| 312 | Dietrich Foundation | Pittsburg, PA 15219 | Gas Operator | Dec 2018 |
| 313 | Dietrich Philip H | Jefferson, OH 44047-301 | Oil & Gas Operator | Dec 2017 |
| 314 | Dietz Oil Field Supply | Dover, OH 44622 | Oil & Gas Operator | Dec 1997 |
| 315 | Dils Oil & Gas | Parkersburg, WV 26102 | Oil & Gas Operator | Dec 2017 |
| 316 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Feb 2019 |
| 317 | Discovery Oil And Gas | Canonburg, PA 15317 | Oil & Gas Operator | Dec 2017 |
| 318 | Discovery Oil LTD | Los Angeles, CA 90067 | Oil & Gas Operator | Dec 1990 |
| 319 | Dixon Exploration Inc | Toledo, OH 43606 | Oil & Gas Operator | Jun 2018 |
| 320 | DJ Oil Company, Inc | Kermit, TX 79745 | Oil & Gas Operator | Feb 2019 |
| 321 | DNL Oil Corp | New Lexington, OH 43764 | Oil & Gas Operator | Dec 2012 |
| 322 | Dome Drilling Co | Westlake, OH 44145-1964 | Oil & Gas Operator | Dec 2009 |
| 323 | Dome Producing | Cleveland, OH 44114 | Oil & Gas Operator | Dec 1988 |
| 324 | Domestic Oil & Gas Co | Bedford, OH 44146 | Oil & Gas Operator | Dec 1990 |
| 325 | Dominion East Ohio | North Canton, OH 44720 | Oil & Gas Operator | Dec 2017 |
| 326 | Dominion Exploration & Production Inc | Houston, TX 77060-2309 | Oil & Gas Operator | Sep 2015 |
| 327 | Dominion Field Services Inc | Richmond, VA 23219 | Oil & Gas Operator | Dec 2013 |
| 328 | Don Yohe Enterprises Inc | Armada, MI 48005 | Oil & Gas Operator | Jun 2015 |
| 329 | Donaker Alan M | Warsaw, OH 43844 | Oil & Gas Operator | Dec 1994 |
| 330 | Donald Byers Oil & Gas LLC | Heath, OH 43056 | Oil & Gas Operator | Dec 2017 |
| 331 | Doran & Associates | Pittsburgh, PA 15220 | Oil & Gas Operator | Dec 1988 |
| 332 | Dorfman Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 333 | Dorsey Oil & Gas LLC | Nashport, OH 43830 | Oil & Gas Operator | Dec 2017 |
| 334 | Dover Atwood Corp. | Massillon, OH 44646 | Oil & Gas Operator | Oct 2018 |
| 335 | Dover Oil Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 1999 |
| 336 | Drillex Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2003 |
| 337 | Dry Hole Producing | Poland, OH 44514-3631 | Oil & Gas Operator | Dec 2017 |
| 338 | Duck Creek Energy Inc | Brecksville, OH 44141 | Oil & Gas Operator | Dec 2017 |
| 339 | Duck Creek Petroleum LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2012 |
| 340 | Dugan Guy E | Walhonding, OH 43843 | Oil & Gas Operator | Dec 2015 |
| 341 | Dugan Harry Oil Co | Newark, OH 43055 | Oil & Gas Operator | Dec 1993 |
| 342 | Dugan Oil And Gas LLC | Walhonding, OH 43843-9612 | Oil & Gas Operator | Dec 2017 |
| 343 | Dupke Roger Oil Co Inc | Reno, OH 45773 | Oil & Gas Operator | Dec 2004 |
| 344 | Durst Oil & Gas, Inc. | Point Pleasant, WV 25550 | Oil & Gas Operator | Dec 2017 |
| 345 | Dustin Energy Inc | Warren, OH 44481 | Oil & Gas Operator | Dec 2017 |
| 346 | Dusty Drilling & Production Co | New Lexington, OH 43764-1552 | Oil & Gas Operator | Dec 2005 |
| 347 | Duty Oil & Gas Prod Co | Akron, OH 44306 | Oil & Gas Operator | Dec 1997 |
| 348 | Dye Walter M | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2016 |
| 349 | E I C Inc | Coshocton, OH 43812 | Oil & Gas Operator | Dec 1984 |
| 350 | Eagle Expl Co/Johnson J | Bolivar, OH 44612 | Oil & Gas Operator | Dec 1989 |
| 351 | Eagle Mountain Energy | Columbus, OH 43214-981 | Oil & Gas Operator | Dec 2002 |
| 352 | Earley Donald E | Utica, OH 43080-0386 | Oil Operator | Dec 2017 |
| 353 | Eastern Amer Energy Corp | Charleston, WV 25304 | Oil & Gas Operator | Dec 2006 |
| 354 | Eastern Mountain Fuel Inc | Marietta, OH 45750-1240 | Oil & Gas Operator | Dec 2002 |
| 355 | Eastern Petroleum Company | Hartville, OH 44632 | Oil & Gas Operator | Sep 1995 |
| 356 | Eastern States Oil & Gas, Inc. | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2017 |
| 357 | Eastland Energy Group Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2017 |
| 358 | Echo Drilling Inc | Newcomerstown, OH 43832 | Oil & Gas Operator | Dec 2017 |
| 359 | Eclipse Resources I LP | State College, PA 16803 | Oil & Gas Operator | Sep 2018 |
| 360 | Eclipse Resources-Ohio LLC | State College, PA 16803 | Oil & Gas Operator | Dec 2017 |
| 361 | Edco Drilling & Producing | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 2006 |
| 362 | Eei Inc | MT Pleasant, MI 48858 | Oil & Gas Operator | Dec 1990 |
| 363 | Elan Energy Inc | Toledo, OH 43604-1207 | Oil & Gas Operator | Dec 1990 |
| 364 | Elephant Exploration Inc. | Hartville, OH 44632 | Oil & Gas Operator | Dec 2017 |
| 365 | Elk Oil Co LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2017 |
| 366 | Elkhead Gas & Oil Co | Newark, OH 43055 | Oil & Gas Operator | Dec 2017 |
| 367 | Ellen P Sharp LLC | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2018 |
| 368 | Ellvie Wells LLC | New Franklin, OH 44319 | Oil & Gas Operator | Dec 2017 |
| 369 | Elsaan Energy LLC | Walhonding, OH 43843 | Oil & Gas Operator | Dec 2017 |
| 370 | Em Energy Ohio LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Sep 2018 |
| 371 | Emmert Leo R | Marblehead, OH 43440 | Oil & Gas Operator | Dec 2004 |
| 372 | Enczi Frank | Junction City, OH 43748 | Oil & Gas Operator | Dec 2016 |
| 373 | Energy Contractors, Inc. | Canal Wincheste, OH 43110 | Oil & Gas Operator | Dec 2017 |
| 374 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2017 |
| 375 | Energy Distributors Inc | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1987 |
| 376 | Energy Exploration & Developme | Cortland, OH 44410 | Oil & Gas Operator | Dec 2017 |
| 377 | Energy Production, Inc | Canton, OH 44711 | Oil & Gas Operator | Dec 2017 |
| 378 | Energy Resources Of America In | Austintown, OH 44515 | Oil & Gas Operator | Dec 2017 |
| 379 | Energy Search Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 380 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2019 |
| 381 | Eninun Inc | Dayton, OH 45415 | Oil & Gas Operator | Dec 1984 |
| 382 | Enterprise Energy Corp | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1985 |
| 383 | Enveron Corporation | Portage, MI 49024 | Oil & Gas Operator | Dec 2017 |
| 384 | Envirogas Inc | Hamburg, NY 14075 | Oil & Gas Operator | Dec 1998 |
| 385 | Environmental BR Ser Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 1987 |
| 386 | Environmental Exp Co | North Canton, OH 44720 | Oil & Gas Operator | Dec 1998 |
| 387 | Environmental Oil Co | Thornville, OH 43076 | Oil & Gas Operator | Dec 2017 |
| 388 | EP Operating Co. | Houston, TX | Oil & Gas Operator | Jan 1993 |
| 389 | Eqt Production Company | Pikeville, KY 41502 | Oil & Gas Operator | Nov 2018 |
| 390 | Equinor USA Onshore Properties | Austin, TX 78730 | Oil & Gas Operator | Sep 2018 |
| 391 | Equitable Production Company | Charleston, WV 25302 | Oil & Gas Operator | Dec 2007 |
| 392 | Equity Oil & Gas Funds Inc | Orlando, FL 32837-6103 | Oil & Gas Operator | Dec 2017 |
| 393 | Eric Petroleum Corp | Austintown, OH 44515-1053 | Oil & Gas Operator | Dec 2017 |
| 394 | Erie Oil & Gas Co | Columbus, OH 43229 | Oil & Gas Operator | Dec 1989 |
| 395 | Euroamerican Pet Corp | Columbus, OH 43229 | Gas Operator | Dec 1991 |
| 396 | Evanco Inc | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1987 |
| 397 | Everflow Eastern PTNS L P | Canfield, OH 44406 | Oil & Gas Operator | Dec 2017 |
| 398 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Oct 2018 |
| 399 | Excalibur Exploration Inc | Greentown, OH 44630-362 | Oil & Gas Operator | Dec 2017 |
| 400 | Exco - North Coast Energy Inc | Kittanming, PA 16201 | Oil & Gas Operator | Dec 2017 |