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Exhibit 21.1
MARKWEST HYDROCARBON, INC.
LIST OF SUBSIDIARIES
NAME OF SUBSIDIARY |
| STATE OR OTHER JURISDICTION OF |
MarkWest Michigan, Inc. |
| Colorado |
MarkWest Resources, Inc. |
| Colorado |
Matrex, LLC |
| Michigan |
MarkWest Energy Partners, L.P. |
| Delaware |
MarkWest Energy GP, L.L.C. |
| Delaware |
MarkWest Energy Operating Company, L.L.C. |
| Delaware |
West Shore Processing Company, LLC |
| Michigan |
Basin Pipeline LLC |
| Michigan |
MarkWest Energy Appalachia, L.L.C. |
| Delaware |
MarkWest Texas GP, L.L.C. |
| Delaware |
MW Texas Limited, L.L.C. |
| Delaware |
MarkWest Michigan Pipeline Company, L.L.C. |
| Michigan |
MarkWest Western Oklahoma Gas Company, L.L.C. |
| Oklahoma |
MarkWest Power Tex L.P. |
| Texas |
MarkWest Pinnacle L.P. |
| Texas |
MarkWest Texas PNG Utility L.P. |
| Texas |
MarkWest Blackhawk L.P. |
| Texas |
MarkWest Energy East Texas Gas CO L.P. |
| Texas |
MarkWest Pipeline CO L.P. |
| Texas |
MarkWest New Mexico L.P. |
| New Mexico |