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

                                 SCHEDULE TO/A-1

            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. 1 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.  1 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.




Items 1, 4, 10 and 12 of the Schedule TO, which  incorporates  by reference  the
information  contained  in  the  Offer  to  Purchase,  are  hereby  amended  and
supplemented as follows.

ITEM 1. SUMMARY TERM SHEET.

     The information  called for in Item 1 is incorporated by reference from the
Offer to  purchase  and the  Supplement  to the Offer to  Purchase  attached  as
exhibits to this Schedule TO-I/A-1.

ITEM 4. TERMS OF THE TRANSACTION

     (a) The  information  about the terms of the  transaction  set forth in the
"Summary  Term Sheet,"  "Section 1. Number of Shares;  Priority and  Proration,"
"Section  2.  Purpose  of Offer;  Certain  Effects  of the  Offer to  Purchase,"
"Section 3. Procedure for Tendering  Shares,"  "Section 4.  Withdrawal  Rights,"
"Section 5.  Acceptance  for  Payment of Shares and Payment of Purchase  Price,"
"Section 6. Conditional Tender of Shares," "Section 7. Certain Conditions of the
Offer,"  "Section 8. Price  Range of Shares;  Dividends,"  "Section  9.  Certain
Information  About Sonoma  Valley  Bancorp,"  "Section 10.  Source and Amount of
Funds," "Section 11. Interest of Directors and Executive Officers;  Transactions
and  Arrangements  Concerning the Shares,"  "Section 12. Effects of the Offer on
the Market For  Shares,"  "Section  13. Legal  Matters;  Regulatory  Approvals,"
"Section 14. Certain Federal Income Tax Consequences," "Section 15. Extension of
the Offer;  Termination,"  "Section  16.  Solicitation  Fees and  Expenses"  and
"Section 17.  Miscellaneous"  of the Offer to Purchase and the Supplement to the
Offer to Purchase is incorporated herein by reference. There will be no material
differences in the rights of security holders as a result of this transaction.

     (b) The  Company has been  advised  that some of its  directors,  executive
officers, or affiliates may tender shares pursuant to the Offer to Purchase.

ITEM 10. FINANCIAL STATEMENTS.

        (a) and (b) -

The Company is  purchasing  the shares  with cash.  The Offer to Purchase is not
subject to any financing condition and the Company is a public reporting company
under Section 13(a) or 15(d) of the  Securities  Exchange Act of 1934 that files
reports  electronically on EDGAR.  Historical  financial statements for the year
ended December 31, 2003 as filed with the Securities and Exchange  Commission on
Form 10-K are incorporated herein by reference.  Historical financial statements
for the years ended December 31, 2002 and 2001 are not deemed to be incorporated
by  this  reference.  The  information  set  forth  under  "Section  9.  Certain
Information  about Sonoma Valley  Bancorp" and "Section 10. Source and Amount of
Funds" is also incorporated herein by reference.





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.

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

        (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.



                                    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:   April 22, 2004              SONOMA VALLEY BANCORP



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