UNITED STATES
                                         SECURITIES AND EXCHANGE COMMISSION
                                               WASHINGTON, D.C. 20549

                                                      FORM N-PX

                                        ANNUAL REPORT OF PROXY VOTING RECORD
                                                         OF
                                     REGISTERED MANAGEMENT INVESTMENT COMPANIES


  INVESTMENT COMPANY ACT FILE NUMBER:           811-2554

  NAME OF REGISTRANT:                           VANGUARD MONEY MARKET RESERVES

  ADDRESS OF REGISTRANT:                        PO BOX 2600, VALLEY FORGE, PA 19482

  NAME AND ADDRESS OF AGENT FOR SERVICE:        HEIDI STAM
                                                PO BOX 876
                                                VALLEY FORGE, PA 19482

  REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE:  (610) 669-1000
  DATE OF FISCAL YEAR END:                     AUGUST 31

  DATE OF REPORTING PERIOD:                    JULY 1, 2005 - JUNE 30, 2006

  FUND:          VANGUARD PRIME MONEY MARKET FUND
                 The fund held no securities entitled to vote at a meeting of
                 shareholders during the reporting period.

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                                              SIGNATURES

  Pursuant to the requirements of the Investment Company Act of 1940, the registrant
   has duly caused this report to be signed on its behalf by the undersigned,
  thereunto duly authorized.


  VANGUARD MONEY MARKET RESERVES

  By:     /s/John J. Brennan
             (Heidi Stam)
             John J. Brennan*
             Chairman _Chief Executive Officer
  Date:      August 31, 2006

       *  By Power of Attorney.  Filed on December 20, 2004, see File Number 002-
           Incorporated by Reference.