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



                                          FORM 10-K


  (Mark one)

  /X/ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
      For the fiscal year ended December 31, 2004

      OR



  / / TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934


      Commission File Number:  333-116509-01


        Wells Fargo Asset Securities Corporation
        Mortgage Pass-Through Certificates
        Series 2004-O

     (Exact name of registrant as specified in its charter)


   New York                                         54-6636476
  (State or other jurisdiction of                   (I.R.S. Employer
  incorporation or organization)                    Identification No.)


   c/o Wells Fargo Bank, N.A.
   9062 Old Annapolis Road
   Columbia, MD                                21045
  (Address of principal executive offices)     (Zip Code)


  Registrant's telephone number, including area code: (410) 884-2000


  Securities registered pursuant to Section 12(b) of the Act:

        NONE.


  Securities registered pursuant to Section 12(g) of the Act:

        NONE.


  Indicate by check mark whether the registrant (1) has filed all reports
  required to be filed by Section 13 or 15(d) of the Securities Exchange
  Act of 1934 during the preceding 12 months (or for such shorter period
  that the registrant was required to file such reports), and (2) has been
  subject to such filing requirements for the past 90 days.

        Yes  X       No ___


  Indicate by check mark if disclosure of delinquent filers pursuant to
  Item 405 of Regulation S-K ( 229.405 of this chapter) is not contained
  herein, and will not be contained, to the best of registrant's knowledge,
  in definitive proxy or information statements incorporated by reference
  in Part III of this Form 10-K or any amendment to this Form 10-K.

        Not applicable.


  Indicate by check mark whether the registrant is an accelerated filer
  (as defined in Exchange Act Rule 12b-2).

        Yes  ___     No  X


  State the aggregate market value of the voting and non-voting common
  equity held by non-affiliates computed by reference to the price at which
  the common equity was last sold, or the average bid and asked price of
  such common equity, as of the last business day of the registrant's most
  recently completed second fiscal quarter.

        Not applicable.


  Indicate the number of shares outstanding of each of the registrant's
  classes of common stock, as of the latest practicable date.

        Not applicable.


     Documents Incorporated by Reference

  List hereunder the following documents if incorporated by reference and
  the Part of the Form 10-K (e.g. Part I, Part II, etc.) into which the
  document is incorporated: (1)Any annual report to security holders; (2)
  Any proxy or information statement; and (3)Any prospectus filed pursuant
  to Rule 424(b) or (c) under the Securities Act of 1933. The listed
  documents should be clearly described for identification purposes (e.g.
  annual report to security holders for fiscal year ended December 24, 1980).

        Not applicable.


                                   PART I

  Item 1.  Business.

            Omitted.

  Item 2.  Properties.

            See Item 15(a), Exhibits 99.1, 99.2, and 99.3, for information
            provided in lieu of information required by Item 102 of
            Regulation S-K.


  Item 3.  Legal Proceedings.

            The registrant knows of no material pending legal proceedings
            involving the trust created under the Pooling and Servicing
            Agreement (the Trust), the Trustee, the Servicer or the
            registrant with respect to the Trust other than routine
            litigation incidental to the duties of the respective parties.


  Item 4.  Submission of Matters to a Vote of Security Holders.

            None.


                                PART II

  Item 5.  Market for registrant's Common Equity and Related Stockholder
           Matters and Issuer Purchases of Equity Securities.

            No established public trading market for the Certificates exists.

            Records provided to the Trust by the DTC and the Trustee
            indicate that as of December 31, 2004, the total number of holders
            of record for the Series of Certificates is 24.


  Item 6.  Selected Financial Data.

            Omitted.


  Item 7.  Management's Discussion and Analysis of Financial Condition and
           Results of Operation.

            Omitted.


  Item 7A. Quantitative and Qualitative Disclosures about Market Risk.

            Not applicable.


  Item 8.  Financial Statements and Supplementary Data.

            See Item 15(a), Exhibits 99.1, 99.2, 99.3, for information
            provided in lieu of information required by Item 302 of
            Regulation S-K.


  Item 9.  Changes in and Disagreements with Accountants on Accounting and
           Financial Disclosure.

            None.


  Item 9A. Controls and Procedures.

            Not applicable.


  Item 9B. Other Information.

            None.


                                PART III

  Item 10. Directors and Executive Officers of the Registrant.

            Not applicable.


  Item 11. Executive Compensation.

            Not applicable.


  Item 12. Security Ownership of Certain Beneficial Owners and Management.

            Not applicable.

  Item 13. Certain Relationships and Related Transactions.

            Not applicable.


  Item 14. Principal Accounting Fees and Services.

            Not applicable.


                                PART IV

  Item 15. Exhibits, Financial Statement Schedules.

   (a) Exhibits

     (31.1) Rule 13a-14(a)/15d-14(a) Certification

     (99.1) Annual Independent Accountants' Servicing Reports concerning
            servicing activities.

      <TABLE>

      
         <c>
      a) Wells Fargo Bank, N.A., as Servicer <F1>

      </TABLE>

     (99.2) Report of Management as to Compliance with Minimum Servicing
            Standards.

      <TABLE>

      
        <c>
      a) Wells Fargo Bank, N.A., as Servicer <F1>

      </TABLE>

     (99.3) Annual Statements of Compliance under the Pooling and Servicing
            Agreements.

      <TABLE>

      
         <c>
      a) Wells Fargo Bank, N.A., as Servicer <F1>

      </TABLE>


     (99.4) Aggregate Statement of Principal and Interest Distributions to
            Certificate Holders.


   (b) Not applicable.

   (c) Omitted.


     (99.5) Reliance Certifications Mandated under the Pooling and Servicing
            Agreement for the year ended December 31, 2004

      <TABLE>

      
         <c>
      a) Wells Fargo Bank, N.A., as Servicer <F2>

      </TABLE>

  <F1> Filed herewith.

  <F2> Certification has been received.


                                SIGNATURES

  Pursuant to the requirements of Section 13 or 15(d) of the Securities
  Exchange Act of 1934, the registrant has duly caused this report to be
  signed on its behalf by the undersigned, thereunto duly authorized:



    Wells Fargo Asset Securities Corporation
    Mortgage Pass-Through Certificates
    Series 2004-O
    (Registrant)


  Signed: Wells Fargo Bank, N.A. as Master Servicer

  By:     Robert Patelunas, Vice President

  By: /s/ Robert Patelunas, Vice President

  Dated:  March 28, 2005


  SUPPLEMENTAL INFORMATION TO BE FURNISHED WITH REPORTS FILED PURSUANT TO
  SECTION 15(d) OF THE ACT BY REGISTRANTS WHICH HAVE NOT REGISTERED
  SECURITIES PURSUANT TO SECTION 12 OF THE ACT.


  (a)(i) No annual report is provided to the Certificateholders other than
  with respect to aggregate principal and interest distributions.


  (a)(ii) No proxy statement, form of proxy or other proxy soliciting
  material has been sent to any Certificateholder with respect to any
  annual or other meeting of Certificateholders.



  Exhibit Index

  Exhibit No.

  Ex-31.1 Rule 13a-14(a)/15d-14(a) Certification

  I, Robert Patelunas, certify that:

  1. I have reviewed this annual report on Form 10-K, and all reports on
     Form 8-K containing distribution or servicing reports filed in
     respect of periods included in the year covered by this annual report
     of Wells Fargo Asset Securities Corporation Mortgage Pass-Through
     Certificates, Series 2004-O Trust;

  2. Based on my knowledge, the information in these reports, taken as a
     whole, does not contain any untrue statement of a material fact or
     omit to state a material fact necessary to make the statements made,
     in light of the circumstances under which such statements were made,
     not misleading as of the last day of the period covered by this
     annual report;

  3. Based on my knowledge, the distribution or servicing information
     required to be provided to the Trustee by the Servicer under the
     Pooling and Servicing or similar, agreement, for inclusion in these
     reports is included in these reports;

  4. I am responsible for reviewing the activities performed by the master
     servicer under the pooling and servicing, or similar, agreement, and
     based on upon my knowledge and the annual compliance review required
     under that agreement, and except as disclosed in the reports, the
     master servicer has fulfilled its obligations under that agreement;
     and

  5. The reports disclose all significant deficiencies relating to the
     servicer's compliance with the minimum servicing standards based upon
     the report provided by an independent public accountant, after
     conducting a review in compliance with the Uniform Single Attestation
     Program for Mortgage Bankers or similar procedure, as set forth in
     the pooling and servicing, or similar, agreement, that is included in
     these reports.

     Date:  March 28, 2005

     /s/ Robert Patelunas
     Signature

     Vice President
     Title


  EX-99.1
(logo) KPMG


KPMG LLP
2500 Ruan Center
666 Grand Avenue
Des Moines, IA 50309


Independent Accountants' Report

The Board of Directors
Wells Fargo Home Mortgage, a division of Wells Fargo Bank, N.A.:


We have examined management's assertion, included in the accompanying
Assertion of Management of Wells Fargo Home Mortgage, a division of Wells
Fargo Bank, N.A. (the Company), that the Company complied with the minimum
servicing standards set forth in the Mortgage Bankers Association of
America's Uniform Single Attestation Program for Mortgage Bankers (USAP) as
of and for the year ended December 31, 2004. Management is responsible for
the Company's compliance with those minimum servicing standards. Our
responsibility is to express an opinion on management's assertion about the
Company's compliance based on our examination.


Our examination was conducted in accordance with attestation standards
established by the American institute of Certified Public Accountants and,
accordingly, included examining, on a test basis, evidence about the
Company's compliance with the minimum servicing standards specified above
and performing such other procedures, as we considered necessary in the
circumstances. We believe that our examination provides a reasonable basis
for our opinion. Our examination does not provide a legal determination on
the Company's compliance with the minimum servicing standards.


In our opinion, management's assertion that the Company complied with the
aforementioned minimum servicing standards as of and for the year ended
December 31, 2004 is fairly stated, in all material respects.


/s/ KPMG LLP


February 23, 2005





  EX-99.2
(logo) Wells Fargo Home Mortgage

1 Home Campus
Des Moines, IA 50328


Assertion of Management of Wells Fargo Home Mortgage, a division of Wells
Fargo Bank, N.A




As of and for the year ended December 31, 2004, Wells Fargo Home Mortgage, a
division of Wells Fargo Bank, N.A. (the Company) has complied in all material
respects with the minimum servicing standards set forth in the Mortgage
Bankers Association of America's Uniform Single Attestation Program for
Mortgage Bankers.

As of and for this same period, the Company had in effect a fidelity bond
along with an errors and omissions policy in the amounts of $100 million and
$20 million, respectively.


/s/ Michael J. Heid
February 23, 2005
Michael J. Heid, Division President, Capital Markets, Finance, & Administration
Wells Fargo Home Mortgage, a division of Wells Fargo Bank, N.A.


/s/ Franklin R. Codel
February 23. 2005
Franklin R. Codel, Executive Vice President, Finance and Corporate Real Estate
Wells Fargo Home Mortgage, a division of Wells Fargo Bank, N.A.


/s/ Michael Lepore
February 23. 2005
Michael Lepore, Executive Vice President, Institutional Lending
Wells Fargo Home Mortgage, a division of Wells Fargo Bank, N.A.


/s/ Mary Coffin
February 23, 2005
Mary Coffin, Executive Vice President, Servicing & Post Closing
Wells Fargo Home Mortgage, a division of Wells Fargo Bank, N.A.



Wells Fargo Home Mortgage
Is a division of Wells Fargo Bank, N.A.





  EX-99.3
(logo) WELLS FARGO HOME MORTGAGE

Wells Fargo Home Mortgage
One Home Campus
Des Moines, IA  50328-0001



March 1, 2005


Re: 2004 Annual Certification


We hereby certify to the best of our knowledge and belief that for the
calendar year of 2004:


1. All real estate taxes, bonds assessments and other lienable items have
been paid.


2. All FHA mortgage insurance, private mortgage insurance premiums, and
flood insurance have been paid (if applicable).


3. Hazard insurance policies held by us meet the requirements as specified
in the servicing agreement, or those of a normal prudent lender if not
specified, and those premiums due have been paid.

4. We have made all property inspections as required.


5. Fidelity bond and Errors and Omissions insurance coverage currently
exists.

6. That the Officer signing this certificate has reviewed the activities
and performance of the Servicer during the preceding fiscal year under the
terms of the Servicing Agreement, Trust Agreement, Pooling and Servicing
Agreement and/or Seller/Servicer Guide or similar agreements and to the
best of this officer's knowledge, the Servicer has fulfilled all of its
duties, responsibilities or obligations of such agreement throughout the
year, or if there has been a default or failure of the servicer to perform
any of such duties, responsibilities or obligations, a description of each
default or failure and the nature and status thereof has been reported.


Sincerely,

/s/ John B. Brown


John B. Brown
Vice President
Wells Fargo Home Mortgage Inc.


Wells Fargo Home Mortgage
is a division of Wells Fargo Bank, N.A.





  Ex-99.4

   Schedule of Year-To-Date Principal and Interest Distributions to
   Certificateholders


   <TABLE>

   Class                              Interest             Principal               Losses             Ending Balance
   
                       <c>                    <c>                  <c>                 <c>
   A-1                           13,881,857.52         44,067,717.44                 0.00             639,281,282.56
   A-R                                    0.41                100.00                 0.00                       0.00
   B-1                              172,867.79             49,351.49                 0.00               8,352,648.51
   B-2                               64,809.98             18,502.40                 0.00               3,131,497.60
   B-3                               36,026.13             10,285.00                 0.00               1,740,715.01
   B-4                               36,005.55             10,279.11                 0.00               1,739,720.89
   B-5                               21,603.32              6,167.46                 0.00               1,043,832.53
   B-6                               14,425.24              4,118.20                 0.00                 697,000.15
   </TABLE>