UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C. 20549

FORM N-17f-2

Certificate of Accounting of Securities and Similar
Investments in the Custody of
Management Investment Companies

Pursuant to Rule 17f-2 [17 CFR 270.17f-2]

1.    Investment Company Act File Number:    Date examination completed:

               811-2591                           October 20, 2006

2. State identification Number:

AL       AK       AZ       AR       CA      CO
CT       DE       DC       FL       GA      HI
ID       IL       IN       IA       KS      KY
LA       ME       MD       MA       MI      MN
MS       MO       MT       NE       NV      NH
NJ       NM       NY       NC       ND      OH
OK       OR       PA       RI       SC      SD
TN       TX       UT       VT       VA      WA
WV       WI       WY       PUERTO RICO

Other  (specify):

3. Exact name of investment company as specified in registration statement:

    RiverSource Money Market Series, Inc.

4. Address of principal executive office (number,street,city,state,zip code):

    50606 Ameriprise Financial Center, Minneapolis, MN 55474


          THIS FORM MUST BE GIVEN TO YOUR INDEPENDENT PUBLIC ACCOUNTANT


            REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the Board of Directors of
RiverSource Money Market Series, Inc.:

We have examined management's assertion, included in the accompanying
Management Statement Regarding Compliance with Certain Provisions of the
Investment Company Act of 1940, that RiverSource Cash Management Fund of
RiverSource Money Market Series, Inc. (the Fund) complied with the provisions
of subsection (b) and (c) of Rule 17f-2 under the Investment Company Act of
1940 as of July 31, 2006 and during the period from November 30, 2005 (the
date of our last examination) through July 31, 2006. Management is responsible
for the Fund's compliance with those provisions. Our responsibility is to
express an opinion on management's assertion about the Fund's compliance based
on our examination.

Our examination was made in accordance with standards established by the
Public Company Accounting Oversight Board (United States) and, accordingly,
included examining, on a test basis, evidence about the Fund's compliance with
those requirements and performing such other procedures as we considered
necessary in the circumstances. Included among our procedures were the
following tests performed as of July 31, 2006 and the period from November 30,
2005 through July 31, 2006, with respect to securities transactions:

o    Count and inspection of all securities located in the vault, if any, of
     Ameriprise Trust Company, the Custodian, without prior notice to
     management;

o    Confirmation of all securities, if any, held by institutions in book
     entry form (Wells Fargo Bank Minnesota, N.A., The Bank of New York, and
     The Depository Trust Company);

o    Confirmation or examination of underlying documentation of all securities
     purchased but not received, hypothecated, pledged, placed in escrow, or
     out for transfer with brokers, pledges and/or transfer agents;

o    Reconciliation of all such securities to the books and records of the
     Fund and the Custodian; and

o    Test of selected security transactions since the date of our last report.

We believe that our examination provides a reasonable basis for our opinion.
Our examination does not provide a legal determination on the Fund's
compliance with the specified requirements.


In our opinion, management's assertion that the Fund was in compliance with
the above mentioned provisions of Rule 17f-2 of the Investment Company Act of
1940 as of July 31, 2006 and for the period from November 30, 2005 through
July 31, 2006 is fairly stated in all material respects.

This report is intended solely for the information and use of management of
the Fund and the Securities and Exchange Commission and should not be used for
any other purpose and is not intended to be and should not be used by anyone
other than these specified parties.


                                        /s/ KPMG LLP
                                        ------------
                                            KPMG LLP


Minneapolis, MN
October 20, 2006



            MANAGEMENT STATEMENT REGARDING COMPLIANCE WITH CERTAIN
               PROVISIONS OF THE INVESTMENT COMPANY ACT OF 1940



     We, as members of management of RiverSource Cash Management Fund of
     RiverSource Money Market Series, Inc. (the Fund) are responsible for
     complying with the requirements of subsections (b) and (c) of Rule 17f-2,
     Custody of Investments by Registered Management Investment Companies, of
     the Investment Company Act of 1940. We are also responsible for
     establishing and maintaining effective internal controls over compliance
     with those requirements. We have performed an evaluation of the Fund's
     compliance with the requirements of subsections (b) and (c) of Rule 17f-2
     as of July 31, 2006 and from November 30, 2005 through July 31, 2006.

     Based on this evaluation, we assert that the Fund was in compliance with
     the requirements of subsections (b) and (c) of Rule 17f-2 of the
     Investment Company Act of 1940 as of July 31, 2006 and from November 30,
     2005 through July 31, 2006, with respect to securities reflected in the
     investment account of the Fund.



     AMERIPRISE FINANCIAL, INC.

     By: /s/ Jeffrey P. Fox
         ------------------
             Jeffrey P. Fox, Vice President-Investment Accounting