<DOCUMENT>
<TYPE>EX-32.1
<SEQUENCE>5
<FILENAME>exhibit321.txt
<DESCRIPTION>EXHIBIT 32.1
<TEXT>
                                                                   EXHIBIT 32.1

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER


                            CERTIFICATION PURSUANT TO


                             18 U.S.C. SECTION 1350,


                             AS ADOPTED PURSUANT TO


                       SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002




     In connection with the Quarterly Report of Automatic Data Processing, Inc.
(the "Company") on Form 10-Q for the fiscal quarter ending September 30, 2003
as filed with the Securities and Exchange Commission  on the date hereof
(the "Report"), I, Arthur F. Weinbach, Chairman and Chief Executive Officer of
the Company, certify, pursuant to 18 U.S.C. ss. 1350, as adopted pursuant to
ss. 906 of the Sarbanes-Oxley Act of 2002, that:


           (1) The Report fully complies with the requirements of section 13(a)
      or 15(d) of the Securities Exchange Act of 1934; and


           (2) The information contained in the Report fairly presents, in all
      material respects, the financial condition and result of operations of the
      Company.




/s/ Arthur F. Weinbach
----------------------
Arthur F. Weinbach
Chairman and Chief Executive Officer
November 5, 2003



</TEXT>
</DOCUMENT>
