| Form: | S-3 |
| CIK: | 0001166036 | | Company Name: | MARKWEST ENERGY PARTNERS L P | | File Number: | 333-157883 |
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| CIK: | 0001315263 | | Company Name: | MarkWest Energy Finance CORP | | File Number: | 333-157883-27 |
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| CIK: | 0001292406 | | Company Name: | MarkWest Energy Operating CO LLC | | File Number: | 333-157883-26 |
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| CIK: | 0001292407 | | Company Name: | Basin Pipeline LLC | | File Number: | 333-157883-25 |
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| CIK: | 0001292408 | | Company Name: | West Shore Processing CO LLC | | File Number: | 333-157883-24 |
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| CIK: | 0001292409 | | Company Name: | MarkWest Energy Appalachia LLC | | File Number: | 333-157883-23 |
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| CIK: | 0001435921 | | Company Name: | Mason Pipeline LTD Liability CO | | File Number: | 333-157883-22 |
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| CIK: | 0001292411 | | Company Name: | MarkWest Michigan Pipeline CO LLC | | File Number: | 333-157883-21 |
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| CIK: | 0001292413 | | Company Name: | MarkWest Oklahoma Gas CO LLC | | File Number: | 333-157883-20 |
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| CIK: | 0001292419 | | Company Name: | MarkWest New Mexico LLC | | File Number: | 333-157883-19 |
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| CIK: | 0001292415 | | Company Name: | MarkWest Pinnacle LLC | | File Number: | 333-157883-18 |
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| CIK: | 0001292416 | | Company Name: | MarkWest PNG Utility LLC | | File Number: | 333-157883-17 |
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| CIK: | 0001292417 | | Company Name: | MarkWest Texas PNG Utility LLC | | File Number: | 333-157883-16 |
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| CIK: | 0001292418 | | Company Name: | MarkWest Blackhawk LLC | | File Number: | 333-157883-15 |
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| CIK: | 0001292414 | | Company Name: | MarkWest Power Tex LLC | | File Number: | 333-157883-14 |
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| CIK: | 0001315242 | | Company Name: | MarkWest Pipeline CO LLC | | File Number: | 333-157883-13 |
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| CIK: | 0001315262 | | Company Name: | MarkWest Energy East Texas Gas CO LLC | | File Number: | 333-157883-12 |
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| CIK: | 0001349175 | | Company Name: | MarkWest Javelina CO LLC | | File Number: | 333-157883-11 |
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| CIK: | 0001349174 | | Company Name: | Markwest Javelina Pipeline CO LLC | | File Number: | 333-157883-10 |
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| CIK: | 0001435926 | | Company Name: | Matrex, L.L.C. | | File Number: | 333-157883-09 |
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| CIK: | 0001435924 | | Company Name: | MarkWest Liberty Gas Gathering, L.L.C. | | File Number: | 333-157883-08 |
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| CIK: | 0001435923 | | Company Name: | MarkWest Gas Services, L.L.C. | | File Number: | 333-157883-07 |
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| CIK: | 0001436012 | | Company Name: | MarkWest Pioneer, L.L.C. | | File Number: | 333-157883-06 |
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| CIK: | 0001412304 | | Company Name: | MarkWest Energy GP, L.L.C. | | File Number: | 333-157883-05 |
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| CIK: | 0001019756 | | Company Name: | MARKWEST HYDROCARBON INC | | File Number: | 333-157883-04 |
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| CIK: | 0001435922 | | Company Name: | MarkWest Marketing, L.L.C. | | File Number: | 333-157883-03 |
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| CIK: | 0001457473 | | Company Name: | MarkWest Gas Marketing, L.L.C. | | File Number: | 333-157883-02 |
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| CIK: | 0001457474 | | Company Name: | MarkWest McAlester, L.L.C. | | File Number: | 333-157883-01 |
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