Exhibit 21.1

MPLX LP

LIST OF SUBSIDIARIES

as of December 31, 2013

	Name of Subsidiary	Jurisdiction of Organization/Incorporation
*	Marathon Pipe Line LLC	Delaware
	MPLX Operations LLC	Delaware
*	MPLX Pipe Line Holdings LP	Delaware
	MPLX Terminal and Storage LLC	Delaware
*	Ohio River Pipe Line LLC	Delaware

* Indicates a company that is not wholly owned directly or indirectly by MPLX LP.