Number of Producing Gas Wells by Company
| Company | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 | 1990 |
| Total | 6,426 | 5,735 | 5,179 | 4,123 | 3,870 | 3,434 | 3,429 | 3,507 | 3,046 | 2,741 | 2,388 | 2,018 | 1,819 | 1,671 | 1,470 | 1,426 | 1,153 | 886 | 819 |
| Amvest Oil and Gas Co. | - | - | - | - | - | 5 | 6 | 6 | 5 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 |
| ANR Production | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 176 |
| Appalachian Energy | 98 | 83 | 74 | 71 | 67 | 64 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Ashland Exploration | - | - | - | - | - | - | - | - | - | - | - | - | 58 | 58 | 58 | 56 | 59 | 53 | 47 |
| Berea Oil and Gas | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 1 | 1 | 1 |
| Blazer Energy Company | - | - | - | - | - | - | - | 48 | 48 | 48 | 48 | 47 | - | - | - | - | - | - | - |
| Blue Flame Energy | 1 | 1 | 1 | 1 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Cabot Oil and Gas Corp. | 345 | 39 | 41 | 38 | 38 | 38 | 39 | 39 | 39 | 38 | 31 | 26 | 26 | 7 | 5 | 5 | 4 | 3 | 3 |
| CD&G Development | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 2 | 2 | 2 | 2 | 1 |
| Chesapeake Appalachia, LLC | 345 | 309 | 269 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| CNG Development | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
| CNG Producing | - | - | - | - | - | - | - | - | - | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | - |
| CNP Development | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| CNR/ Columbia Gas | - | - | - | 239 | 217 | 208 | 194 | 182 | 183 | 161 | 146 | 144 | 144 | 144 | 145 | 143 | 140 | 130 | 139 |
| CNX | 2,310 | 2,598 | 2,327 | 1,758 | 1,708 | 1,464 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Consol, Inc. | - | - | - | - | - | - | 749 | 936 | 640 | 520 | 413 | 288 | 202 | 135 | 88 | 74 | - | - | - |
| Consol-Ray | - | - | - | - | - | - | - | - | - | - | - | - | - | 14 | 14 | 14 | 14 | 13 | 13 |
| Dart Oil & Gas | 11 | 6 | 5 | 2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Daugherty Petroleum, Inc. | 33 | 32 | 29 | 23 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Dominion Appalachian | 13 | 13 | 12 | 12 | 12 | 10 | 10 | 10 | 10 | 9 | 2 | 2 | - | - | - | - | - | - | - |
| Eastern American Energy | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | - | - | - |
| Edisto Resources | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 6 | 4 | 4 |
| EHPC | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 15 |
| Elliot Production | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| EMAX Oil | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 2 | 2 | 2 | 2 | - |
| EOG Resources | 1 | 1 | 1 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Equitable Res./ EREX | 2,724 | 2,510 | 2,322 | 1,927 | 1,743 | 1,572 | 1,479 | 1,379 | 1,324 | 1,150 | 1,150 | 1,040 | 975 | 912 | 899 | 798 | 684 | 601 | 368 |
| Evan Energy | - | - | - | - | 25 | 25 | 23 | 13 | 4 | 3 | - | - | - | - | - | - | 1 | 1 | 1 |
| Excel Energy | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 1 | 1 |
| Exploration Partners | - | - | - | 1 | 1 | 1 | 1 | 1 | 1 | 3 | 1 | 1 | 1 | 1 | 1 | 1 | - | - | - |
| Gas Exploration | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 2 | - | - | - | - | - |
| Geomet | 13 | 9 | 6 | 5 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Glamorgan Gas | 6 | 6 | 6 | 6 | 6 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Hard Rock Exploration | 12 | 11 | 11 | 4 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Island Creek Coal Co. | - | - | - | - | 27 | 22 | 42 | 47 | 49 | 48 | 51 | 53 | 60 | 68 | 51 | 41 | 24 | - | - |
| Linn Operating, Inc. | 8 | 8 | 6 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| North Coast Energy | - | 1 | 1 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Oxy USA | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 27 | - | 1 |
| P & S Corporation | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 6 | 5 | 6 | 6 |
| Panther Crk. Ltd. | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 2 | 2 | 2 | 2 |
| Paramont Energy | 3 | 3 | 3 | 3 | 2 | 2 | 2 | - | - | - | - | - | - | - | - | - | - | - | - |
| Peake Operating | - | - | - | - | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Penn VA Resources | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | - | - | - | - | - |
| Pine Mountain | 149 | 93 | 53 | 19 | 10 | 9 | 11 | 11 | 10 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 10 | 10 |
| Pochontas Gas Partnership | - | - | - | - | - | - | 789 | 753 | 652 | 552 | 444 | 315 | 260 | 236 | 117 | 185 | 96 | - | - |
| PVRC | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 13 |
| R & B Petroleum | 0 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | - | - | 2 | 2 | 2 | 2 |
| Ratliff Gas Co. | - | - | - | - | - | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | - | - | - | - |
| Scott Oil and Gas | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 |
| Virginia Gas Co. | - | - | - | - | - | - | 70 | 70 | 69 | 70 | 70 | 70 | 59 | 60 | 59 | 68 | 62 | 46 | 7 |