EXHIBIT 32.1

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 Annual Report on Form 10-K of Republic Services, Inc. (the “Company”) for the period ended December 31, 2004 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, James E. O’Connor, Chairman and Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

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

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

February 25, 2005

/s/ James E. O’Connor

James E. O’Connor

Chairman and Chief Executive Officer

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