Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The certification set forth below is being submitted in connection with the annual report on Form 10-K for the purpose of complying with Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 and Section 1350 of Chapter 63 of Title 18 of the United States Code.

LeRoy D. Nosbaum, the Chief Executive Officer and David G. Remington, the Chief Financial Officer of Itron, Inc., each certifies that to the best of his knowledge:

(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/    LEROY D. NOSBAUM        

LeRoy D. Nosbaum

Chairman of the Board and Chief Executive Officer

March 12, 2004

/s/    DAVID G. REMINGTON        

David G. Remington

Vice President and Chief Financial Officer

March 12, 2004