UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION,
                             WASHINGTON, D.C. 20549
                           ---------------------------

                                 SCHEDULE TO/A-3

            TENDER OFFER STATEMENT UNDER SECTION 14(d)(1) or 13(e)(1)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                              Sonoma Valley Bancorp
                              ---------------------
                       (Name of Subject Company (Issuer))

                              Sonoma Valley Bancorp
                              ---------------------
                        (Name of Filing Person (Issuer))

                           Common Stock, No Par Value
                           --------------------------
                         (Title of Class of Securities)

                                   835592 106
                                   ----------
                      (CUSIP Number of Class of Securities)

                                Mel Switzer, Jr.
                      President and Chief Executive Officer
                               202 W. Napa Street
                            Sonoma, California 95476
                                 (707) 935-3200
                                 --------------
                 (Name, address and telephone numbers of persons
               authorized to receive notices and communications on
                            behalf of filing persons)

                                    Copy to:

                                  Daniel B. Eng
                                 David C. Adams
                              Bartel Eng & Schroder
                         1331 Garden Highway, Suite 300
                          Sacramento, California 95833
                                 (916) 442-0400

                            CALCULATION OF FILING FEE
           Transaction valuation*               Amount of filing fee**
                $3,500,000                             $443.45

* Calculated  solely for the purpose of determining the filing fee in accordance
with Rule 0-11(b)(1). This calculation assumes the purchase of 100,000 shares at
$35.00 per share.

 **  Previously paid


[ ]       Check  the box if any part of the fee is offset  as  provided  by Rule
          011(a)(2)  and identify the filing with which the  offsetting  fee was
          previously   paid.   Identify  the  previous  filing  by  registration
          statement number or the Form or Schedule and the date of its filing.

          Amount Previously Paid:  Not applicable
          Form or Registration Number:  Not applicable
          Filing Party:  Not applicable
          Date Filed:  Not applicable

[ ]       Check  the  box  if  the   filing   relates   solely  to   preliminary
          communications made before the commencement of a tender offer:

Check the  appropriate  boxes below to designate any  transactions  to which the
statement relates:

[ ]       third party tender offer subject to Rule 14d-1.

[X]       issuer tender offer subject to Rule 13e-4.

[ ]       going private transaction subject to Rule 13e-3.

[ ]       amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results
of a tender offer: [ ]

Introductory Statement

This Amendment No. 3 to the issuer tender offer of Sonoma Valley Bancorp,  Inc.,
a California  corporation,  (the  "Company") to purchase up to 100,000 shares of
its Common Stock,  no par value.  Sonoma Valley  Bancorp is offering to purchase
these shares at $35.00 per share, net to the seller in cash,  without  interest,
upon the terms and subject to the conditions set forth in the Offer to Purchase,
dated April 6, 2004, and in the related Letter of Transmittal, which, as amended
or  supplemented  from  time to time,  together  constitute  the  "Offer."  This
Amendment  No.  3 to  the  Issuer  Tender  Offer  on  Schedule  TO is  filed  in
satisfaction of the reporting requirements of Rule 13e-4(c)(1) promulgated under
the Securities Exchange Act of 1934, as amended.

Item 12 of the Schedule  TO, which  incorporates  by reference  the  information
contained  in the Offer to  Purchase,  is hereby  amended  and  supplemented  as
follows.

ITEM 12. EXHIBITS.

         (a)(1)(i)    Offer to Purchase, dated April 6, 2004.(1)

         (a)(1)(ii)   Letter of  Transmittal,   together  with   Guidelines  for
                      Certification  of  Taxpayer   Identification   Number   on
                      Substitute Form W-9. (1)


         (a)(1)(iii)  Letter  to Shareholders of Sonoma Valley Bancorp from Mel
                      Switzer, Jr., President and Chief Executive Officer, dated
                      April 6, 2004. (1)

         (a)(1)(iv)   Notice of Guaranteed Delivery. (1)

         (a)(1)(v)    Letter  to  Brokers,  Dealers,  Commercial  Banks,  Trust
                      Companies and Other Nominees, dated April 6, 2004. (1)

         (a)(1)(vi)   Letter to Clients for use by Brokers, Dealers, Commercial
                      Banks,  Trust  Companies  and  Other  Nominees  to  their
                      Clients, dated April 6, 2004. (1)

         (a)(1)(vii)  Supplement Number 1 to the Offer to Purchase, dated April
                      22, 2004. (2)

         (a)(1)(viii) Supplement Number 2 to the Offer to Purchase dated  April
                      29, 2004. (3)

         (a)(5)(i)    Press Release dated April 6, 2004. (1)

         (a)(5)(ii)   Press Release dated  May  5, 2004 announcing supplemental
                      information to the Offer to Purchase.

         (b)          Not applicable

         (c)          Not applicable

         (d)          Not applicable

         (e)          Not applicable

         (f)          Not applicable

         (g)          Not applicable

         (h)          Not applicable

(1) Incorporated by reference from Schedule TO-I filed on April 6, 2004.
(2) Incorporated by reference from Schedule TO-I/A-1 filed on April 22, 2004.
(3) Incorporated by reference from Schedule TO-I/A-1 filed on April 29, 2004.







                                    SIGNATURE


     After due inquiry  and to the best of my  knowledge  and belief,  I certify
that the information set forth in this statement is true, complete and correct.

Date:    May 5, 2004                   SONOMA VALLEY BANCORP



                                       By: /s/ Mel Switzer, Jr.
                                          -------------------------------
                                          Mel Switzer, Jr.,
                                          President and Chief Executive Officer
                                          (Principal Executive Officer)