EXHIBIT 32.1

# CERTIFICATION OF
PRESIDENT & CHIEF EXECUTIVE OFFICER

# PURSUANT TO 18 U.S.C.
SECTION 1350(a)

In connection with the accompanying
Quarterly Report on Form 10-Q of USF Corporation for the quarter ended April 3, 2004, I,
Richard P. DiStasio, President & Chief Executive Officer of USF Corporation, hereby
certify pursuant to 18 U.S.C. Section 1350(a), as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, to the best of my knowledge and belief, that:

|(1) | such Quarterly Report on Form l0-Q for the quarter ended April 3, 2004, 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 such Quarterly Report on Form 10-Q for the quarter
          ended April 3, 2004, fairly presents, in all material respects, the financial
          condition and results of operations of USF Corporation.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

A signed original of this written
statement required by Section 906 has been provided to USF Corporation and will be
retained by USF Corporation and furnished to the Securities and Exchange Commission or its
staff upon request.

| |                                                                                 
| | --------------------------------------------------------------------------------
| | /s/ Richard P. DiStasio
Richard P. DiStasio
 President & Chief Executive Officer

Date: May 7, 2004

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EXHIBIT 32.2

# CERTIFICATION OF
PRINCIPAL FINANCIAL OFFICER

# PURSUANT TO 18 U.S.C.
SECTION 1350(a)

In connection with the accompanying
Quarterly Report on Form 10-Q of USF Corporation for the quarter ended April 3, 2004, I,
Thomas E. Bergmann, Senior Vice President, Finance and Chief Financial Officer of USF
Corporation, hereby certify pursuant to 18 U.S.C. Section 1350(a), as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge and belief,
that:

|(1) | such Quarterly Report on Form l0-Q for the quarter ended April 3, 2004, 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 such Quarterly Report on Form 10-Q for the quarter
          ended April 3, 2004, fairly presents, in all material respects, the financial
          condition and results of operations of USF Corporation.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

A signed original of this written
statement required by Section 906 has been provided to USF Corporation and will be
retained by USF Corporation and furnished to the Securities and Exchange Commission or its
staff upon request.

| |                                                                                                   
| | --------------------------------------------------------------------------------------------------
| | /s/ Thomas E. Bergmann
Thomas E. Bergmann
Senior Vice President, Finance
& Chief Financial Officer

Date: May 7, 2004