Exhibit 21.1
Entity |
| State of Incorporation |
Bright Star Partnership |
| Texas |
Centrahoma Processing LLC |
| Delaware |
Jefferson Gas Gathering Company, L.L.C. |
| Delaware |
MarkWest Blackhawk, L.L.C. |
| Texas |
MarkWest Bluestone Ethane Pipeline, L.L.C. |
| Delaware |
MarkWest Buffalo Creek Gas Company, L.L.C. |
| Oklahoma |
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. |
| Delaware |
MarkWest Energy Appalachia, L.L.C. |
| Delaware |
MarkWest Energy East Texas Gas Company, L.L.C. |
| Delaware |
MarkWest Energy Finance Corporation |
| Delaware |
MarkWest Energy GP, L.L.C. |
| Delaware |
MarkWest Energy Operating Company, L.L.C. |
| Delaware |
MarkWest Energy South Texas Gas Company, L.L.C. |
| Delaware |
MarkWest Energy West Texas Gas Company, L.L.C. |
| Delaware |
MarkWest Gas Marketing, L.L.C. |
| Texas |
MarkWest Gas Services, L.L.C. |
| Texas |
MarkWest Hydrocarbon, Inc. |
| Delaware |
MarkWest Javelina Company, L.L.C. |
| Texas |
MarkWest Javelina Pipeline Company, L.L.C. |
| Texas |
MarkWest Liberty Bluestone, L.L.C. |
| Delaware |
MarkWest Liberty Ethane Pipeline, L.L.C. |
| Delaware |
MarkWest Liberty Gas Gathering, L.L.C. |
| Delaware |
MarkWest Liberty Midstream & Resources, L.L.C. |
| Delaware |
MarkWest Mariner Pipeline, L.L.C. |
| Delaware |
MarkWest Marketing, L.L.C. |
| Delaware |
MarkWest McAlester, L.L.C. |
| Oklahoma |
MarkWest Michigan Pipeline Company, L.L.C. |
| Michigan |
MarkWest Mountaineer Pipeline Company, L.L.C. |
| Delaware |
MarkWest New Mexico, L.L.C. |
| Texas |
MarkWest Ohio Fractionation Company, L.L.C. |
| Delaware |
MarkWest Oklahoma Gas Company, L.L.C. |
| Oklahoma |
MarkWest Panola Pipeline, L.L.C. |
| Texas |
MarkWest Pinnacle, L.L.C. |
| Texas |
MarkWest Pioneer, L.L.C. |
| Delaware |
MarkWest Pipeline Company, L.L.C. |
| Texas |
MarkWest PNG Utility, L.L.C. |
| Texas |
MarkWest POET, L.L.C. |
| Delaware |
MarkWest Power Tex, L.L.C. |
| Texas |
MarkWest Ranger Pipeline Company, L.L.C. |
| Delaware |
MarkWest Texas LPG Pipeline, L.L.C. |
| Texas |
MarkWest Texas PNG Utility, L.L.C. |
| Texas |
MarkWest Utica EMG Condensate, L.L.C. |
| Delaware |
MarkWest Utica EMG, L.L.C. |
| Delaware |
MarkWest Utica Operating Company, L.L.C. |
| Delaware |
Mason Pipeline Limited Liability Company |
| Michigan |
Matrex, L.L.C. |
| Michigan |
Mule Sidetracks, L.L.C. |
| Delaware |
Mule Tracts, L.L.C. |
| Delaware |
Ohio Condensate Company, L.L.C. |
| Delaware |
Ohio Gathering Company, L.L.C. |
| Delaware |
Ohio Utica Jefferson Dry Gas Gathering Company, L.L.C. |
| Delaware |
Panola Pipeline Company, LLC |
| Texas |
West Relay Gathering Company, L.L.C. |
| Delaware |
West Shore Processing Company, L.L.C. |
| Michigan |
Wirth Gathering, a general partnership |
| Oklahoma |
