EXHIBIT 32.1


                            CERTIFICATION PURSUANT TO
                 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
                   SECTION 906 OF THE SARBANES-OXLEY ACT 2002

     In  connection  with the  annual  report  of  Sonoma  Valley  Bancorp  (the
"Company")  on Form 10-K for the period  ending  December 31, 2003 as filed with
the Securities and Exchange  Commission on the date hereof (the  "Report"),  We,
Mel Switzer, Jr., Chief Executive Officer and Mary Quade Dieter, Chief Financial
Officer, of the Company certify,  pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 for the Sarbanes-Oxley Act of 2002 , that to the best of
our knowledge and belief:

     (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.

        Dated:   March 23, 2004     /s/ Mel Switzer, Jr.
                                    ---------------------------
                                    Mel Switzer, Jr.,
                                    Chief Executive Officer
                                    (Principal Executive Officer)

        Dated:   March 23, 2004     /s/ Mary Quade Dieter
                                    ---------------------------
                                    Mary Quade Dieter,
                                    Chief Financial Officer
                                    (Principal Financial and Accounting Officer)