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

________________________________________________________________________________


                                   FORM 11-K

________________________________________________________________________________


[X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
      ACT OF 1934

      For the fiscal year ended: December 31, 2003

      OR

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

      For the transition period from ________________ to ________________

Commission File Number:             333-56336

A.    Full title of the plan and the address of the plan, if different from that
      of the issuer named below:

                  State Auto Insurance Companies Capital Accumulation Plan

B.    Name of issuer of the securities held pursuant to the plan and the address
      of its principal executive office:

                        State Auto Financial Corporation
                             518 East Broad Street
                           Columbus, Ohio 43215-3976

                                       1


                              REQUIRED INFORMATION

      The following financial statements and supplemental schedules for the
State Auto Insurance Companies Capital Accumulation Plan are being filed
herewith:

Financial Statements for the years ended December 31, 2003 and 2002,
and Supplemental Schedule for the year ended December 31, 2003

Report of Independent Registered Public Accounting Firm

Audited Financial Statements:

      Statements of Assets Available for Benefits

      Statement of Changes in Assets Available for Benefits

      Notes to Financial Statements

Supplemental Schedule:

      Schedule of Assets (Held at End of Year)

      The following exhibits are being filed herewith:



Exhibit No.       Description
-----------       -----------
                                                                        
    1             Consent of Independent Registered Public Accounting Firm    Included herein


                                        2


            Report of Independent Registered Public Accounting Firm

Plan Administrative Committee
State Auto Insurance Companies Capital Accumulation Plan

We have audited the accompanying statements of assets available for benefits of
the State Auto Insurance Companies Capital Accumulation Plan as of December 31,
2003 and 2002, and the related statement of changes in assets available for
benefits for the years then ended. These financial statements are the
responsibility of the Plan's management. Our responsibility is to express an
opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the assets available for benefits of the Plan as of
December 31, 2003 and 2002, and the changes in assets available for benefits for
the years then ended, in conformity with U.S. generally accepted accounting
principles.

Our audits were performed for the purpose of forming an opinion on the financial
statements taken as a whole. The accompanying schedule of assets (held at end of
year) as of December 31, 2003 is presented for the purpose of additional
analysis and is not a required part of the financial statements but is
supplementary information required by the Department of Labor's Rules and
Regulations for Reporting and Disclosure under the Employee Retirement Income
Security Act of 1974. The supplemental schedule has been subjected to the
auditing procedures applied in our audits of the financial statements and, in
our opinion, is fairly stated in all material respects in relation to the
financial statements taken as a whole.

/s/ Ernst & Young LLP

Columbus, Ohio
June 24, 2004

                                       3


            STATE AUTO INSURANCE COMPANIES CAPITAL ACCUMULATION PLAN

                  Statements of Assets Available for Benefits



                                                                  DECEMBER 31
                                                           2003                2002
                                                      ------------         -----------
                                                                     
Assets
Investments:
  Shares of registered investment companies           $ 99,720,718          73,368,432
  Interest-bearing cash                                 12,174,623          14,051,438
  Common /collective trusts                             15,490,394          15,108,988
  Affiliated stock                                       1,087,932             561,189
  Loans to participants                                  2,422,456           2,466,686
                                                      ------------         -----------
Total investments                                      130,896,123         105,556,733

Contribution receivables:
  Employee                                                       -              11,000
  Employer                                                       -               6,500
                                                      ------------         -----------
Total receivables                                                -              17,500
                                                      ------------         -----------
Assets available for benefits                         $130,896,123         105,574,233
                                                      ============         ===========


See accompanying notes.

                                       4


            STATE AUTO INSURANCE COMPANIES CAPITAL ACCUMULATION PLAN

             Statements of Changes in Assets Available for Benefits



                                                        YEARS ENDED
                                                        DECEMBER 31
                                                 2003               2002
                                            -------------       -----------
                                                          
Additions:
  Interest and dividends                    $   2,631,527         2,014,616

Contributions:
  Employee                                      7,015,948         6,609,902
  Employer                                      2,681,942         2,597,286
                                            -------------       -----------
Total contributions                             9,697,890         9,207,188

Total additions                                12,329,417        11,221,804

Deductions:
  Benefit payments                              6,858,337         6,228,766
  Participant loan fees                            16,258            16,031
                                            -------------       -----------
Total deductions                                6,874,595         6,244,797

Net appreciation (depreciation)
 in fair value of investments                  19,867,068       (13,732,511)
                                            -------------       -----------
  Net increase (decrease)                      25,321,890        (8,755,504)

Assets available for benefits:
  Beginning of year                           105,574,233       114,329,737
                                            -------------       -----------
  End of year                               $ 130,896,123       105,574,233
                                            =============       ===========


See accompanying notes.

                                       5


            STATE AUTO INSURANCE COMPANIES CAPITAL ACCUMULATION PLAN
                        Notes to the Financial Statements
                                December 31, 2003

1. DESCRIPTION OF THE PLAN

ORGANIZATION

      The State Auto Insurance Companies Capital Accumulation Plan (the Plan), a
defined-contribution plan, was adopted effective June 1, 1982, by State
Automobile Mutual Insurance Company and its affiliates (the Company) for the
purpose of providing a savings plan for the benefit of its employees.

      The following description of the Plan provides only general information.
Participants should refer to the Plan Document for a complete description of the
Plan.

GENERAL

      An employee of the company is eligible to participate in the Plan as of
the first pay period subsequent to thirty days after the employee's hire date,
provided the employee is or will attain age 21 during the calendar year
following the employee's hire date.

      The Plan was amended and restated effective January 1, 1997 including
subsequent amendments through January 1, 2004, to comply with recent
legislation, regulation and rulings. See "Contributions" and "Investment
Options."

CONTRIBUTIONS

      Each participant may contribute any percentage of their salary between 1%
and 50% (basic contribution). Subject to certain limitations, the Company
matches the first 2% of basic contributions of participant salary at the rate of
75 cents for each dollar contributed; basic contributions of 3% to 6% are
matched at a rate of 50 cents for each dollar contributed. Participants can
change their rate of deferral as of any given pay date up to a maximum of four
times per calendar year. Participants may also suspend contributions at any
time. Participants may elect to make supplemental contributions in the form of
after tax salary deferrals. Total participant contributions may not exceed 50%
of salary.

      Based on a provision of the Plan that became effective in January 2002, as
of January 1, 2004, all Plan participants who attain age 50 or older during the
calendar year, and are making the maximum Internal Revenue Code (the "Code")
pre-tax contribution, may make additional "Catch-up Contributions" each pay
period in any whole percentage amount of their compensation from 1% to 25%, up
to a dollar limitation on the amount of Catch-up Contribution established by
law.

VESTING

      Plan participants are immediately fully vested in employee contributions
and related net earnings or losses. Full vesting in employer contributions and
related net earnings and losses occurs upon three completed years of service.
Any employee terminating prior to three completed years of service vests in
employer contributions and related net earnings and losses at percentages set
forth by the Plan document.

      In addition, employer contributions and related net earnings or losses are
fully vested upon retirement at age 65, death or total and permanent disability.

      Any forfeitures of non-vested employer contributions and related net
earnings or losses reduce future employer contributions.

PARTICIPANT'S ACCOUNTS

      Each participant's account is credited with the participant's
contributions and allocations of a) the Company's contributions and b) Plan
earnings, and is charged with applicable participant loan fees. Allocations are
based on participant earnings or account balances, as defined. The benefit to
which a participant is entitled is the benefit that can be provided from the
participant's account.

                                       6


            STATE AUTO INSURANCE COMPANIES CAPITAL ACCUMULATION PLAN
                  Notes to the Financial Statements, Continued

PARTICIPANT LOANS

      Participants may borrow from their fund accounts a minimum of $1,000 up to
a maximum of the lesser of $50,000 or 50% of their vested account balance. Loan
terms range from 1-5 years, or up to 10 years for the purchase of a primary
residence. The loans are secured by the balance in the participant's account and
bear interest at a rate commensurate with local prevailing rates as determined
quarterly by the Plan Administrative Committee. Principal and interest is paid
ratably through bi-weekly payroll deductions.

INVESTMENT OPTIONS

      Under the Plan trust agreement, participants may direct how their plan
contributions are to be invested. The following description of the investment
options provides only general information. Participants should refer to the Plan
document for a complete description of the investments.

      Plan contributions may be invested in the following ten funds at December
31, 2003:

Fidelity Puritan Fund: Consists of a diversified portfolio of high-yielding
equity securities and bonds.

Fidelity Contrafund: Consists primarily of seemingly undervalued common stocks
and convertible securities with potential for market growth.

Fidelity Equity Income Fund: Consists primarily of stocks which may pay a higher
than average dividend and stocks with potential for market growth.

Fidelity U.S. Government Reserves Fund: Consists of short-term instruments
issued by the U.S. Government and/or its agencies and repurchase agreements
secured by U.S. Government obligations.

Fidelity Managed Income Portfolio Fund: Consists primarily of high quality short
and long-term investment contracts. Investment contracts have both variable and
fixed rates.

Fidelity Aggressive Growth Fund: Consists primarily of equity securities of
companies with growth potential.

Spartan U.S. Equity Index Fund: Consists of equity securities that correspond to
those listed in the Standard & Poor's 500 Index.

Fidelity Intermediate Bond Fund: Consists primarily of intermediate term,
investment grade debt securities of U.S. corporations and U.S. Government
Agencies.

Fidelity Diversified International Fund: Consists primarily of foreign
securities.

State Auto Financial Corporation Common Stock Fund: Consists of publicly traded
common stock of the State Auto Financial Corporation, an affiliate to the
Company. The stock is traded on the NASDAQ under the ticker symbol, STFC.

      Effective January 1, 2004, Plan contributions may be invested in the
following additional six funds:

Fidelity Freedom Income Fund: Consists of Fidelity bond mutual funds and
Fidelity money market mutual funds, and a lesser percentage of Fidelity stock
mutual funds.

Fidelity Freedom 2000 Fund: Consists of Fidelity bond mutual funds and Fidelity
money market mutual funds and a lesser percentage of Fidelity stock mutual
funds.

Fidelity Freedom 2010 Fund: Consists of Fidelity stock mutual funds and Fidelity
bond mutual funds and a lesser percentage in Fidelity money market mutual funds.
The mix of underlying funds will gradually become more conservative over time.

Fidelity Freedom 2020 Fund: Consists of Fidelity stock mutual funds and a lesser
percentage of Fidelity bond mutual funds. The mix of underlying funds will
gradually become more conservative over time.

Fidelity Freedom 2030 Fund: Consists largely of Fidelity stock mutual funds and
a lesser percentage of Fidelity bond mutual funds. The mix of underlying funds
will gradually become more conservative over time.

Fidelity Freedom 2040 Fund: Consists primarily of Fidelity stock mutual funds
and a lesser percentage of Fidelity bond mutual funds. The mix of underlying
funds will gradually become more conservative over time.

ADMINISTRATIVE EXPENSES

      All administrative expenses, excluding participant loan fees, and trustee
fees are paid by the Company.

                                       7


            STATE AUTO INSURANCE COMPANIES CAPITAL ACCUMULATION PLAN
                  Notes to the Financial Statements, Continued

PAYMENT OF BENEFITS

      Upon termination of service, participants generally receive a lump-sum
amount equal to the value of their account less outstanding loan balances.
Alternatively, qualifying participants can elect to receive their account value
less outstanding loan balances in installments over a period not to exceed 10
years or, in the case of a retired participant, over a period not to exceed
normal life expectancy.

      Participants may semiannually withdraw from their supplemental accumulated
contributions and, subject to certain conditions, participants may withdraw from
their accumulated basic and supplemental contributions based on financial
hardship. After participants have been in the plan for five years, and once
every two years thereafter, participants may withdraw the vested portion of
employer contributions credited to their account.

PLAN TERMINATION

      While the Company has not expressed any intent to terminate the Plan or to
discontinue contributions, it is free to do so at any time, subject to the
provisions set forth in the Employee Retirement Income Security Act of 1974.
Should the Plan be terminated at some future time, all participants become 100%
vested in benefits earned as of the termination date.

2. SIGNIFICANT ACCOUNTING POLICIES

BASIS OF PRESENTATION

      The accounting records of the Plan are maintained in conformity with U.S.
generally accepted accounting principles.

USE OF ESTIMATES

      The preparation of financial statements in conformity with U.S. generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Actual results could differ from those estimates.

VALUATION OF INVESTMENTS AND RELATED INVESTMENT INCOME

      Investments are stated at fair value. The common/collective trust is
valued based on quoted redemption value on the last business day of the Plan
year. Shares of registered investment companies and shares of the State Auto
Financial Corporation Common Stock Fund are valued at quoted market prices that
represent the net asset values of shares held by the Plan at year-end. Loans to
plan participants, which must be approved by the Plan Advisory Committee, are
valued at their outstanding balances, which approximate fair value.

      Investment income, including appreciation and depreciation in fair value
of investments, is allocated to participant accounts daily based upon the ratio
of each participants account to the total fund balance.

                                       8


            STATE AUTO INSURANCE COMPANIES CAPITAL ACCUMULATION PLAN
                  Notes to the Financial Statements, Continued

3. INVESTMENTS

      The following investments, at fair value, represented 5% or more of assets
available for benefits as of December 31, 2003 and 2002:



                                                                    DECEMBER 31
                                                                 2003          2002
                                                            ------------    ----------
                                                                      
Investments in shares of registered investment companies:
  Fidelity Contrafund                                       $ 37,691,937    28,424,895
  Fidelity Equity Income Fund                                 28,520,842    20,823,057
  Fidelity U.S. Government Reserves Fund                      12,174,623    14,051,438
  Fidelity Puritan Fund                                       10,980,664     8,527,111
  Spartan U.S. Equity Index Fund                               7,364,679     5,268,450
Investment in common/collective trusts:
  Fidelity Managed Income Portfolio Fund                    $ 15,490,394    15,108,988


During 2003 and 2002, the Plan's investments (including investments bought and
sold, as well as held during the year) appreciated (depreciated) in value as
follows:



                                                                 2003            2002
                                                             ------------    -----------
                                                                       
Shares of registered investment companies                    $ 19,551,583    (13,732,511)
Affiliated stock                                                  315,485              -
                                                             ------------    -----------
Total realized and unrealized appreciation (depreciation)    $ 19,867,068    (13,732,511)
                                                             ============    ===========


4. FEDERAL INCOME TAX STATUS

      The Plan has received a determination letter from the Internal Revenue
Service dated August 16, 2002, stating that the Plan is qualified under Section
401(a) of the Code and, therefore, the related trust is exempt from taxation.
Once qualified, the Plan is required to operate in conformity with the Code to
maintain its qualification. The plan administrator believes the Plan is being
operated in compliance with the applicable requirements of the Code and,
therefore, believes that the Plan is qualified and the related trust is tax
exempt.

                                       9


            STATE AUTO INSURANCE COMPANIES CAPITAL ACCUMULATION PLAN

          Schedule H, Line 4i-Schedule of Assets (Held At End of Year)

                          EIN # 31-4316080 /Plan # 004

                                DECEMBER 31, 2003



                                                                                              Current
Identity of Issue                                             Shares           Cost            Value
-----------------                                           ----------    -------------    ------------
                                                                                  
Shares of Registered Investment Companies:
  Fidelity Puritan Fund                                        594,313    $  10,427,582    $ 10,980,664

  Fidelity Contrafund                                          763,768       33,763,207      37,691,937

  Fidelity Equity Income Fund                                  573,283       25,705,326      28,520,842

  Fidelity Intermediate Bond Fund                              293,276        3,084,042       3,126,317

  Fidelity U.S. Government Reserves Fund                    12,174,623       12,174,623      12,174,623

  Fidelity Aggressive Growth Fund                              430,202       12,407,453       6,424,412

  Fidelity Diversified International Fund                      232,664        4,963,359       5,611,867

  Spartan U.S. Equity Index Fund                               186,873        7,326,809       7,364,679

Investment in common/collective trusts:
  Fidelity Managed Income Portfolio Fund                    15,490,394       15,490,394      15,490,394

Affiliated Stock
  *  State Auto Financial Corporation Common Stock Fund         46,612          808,130       1,087,932

  Participant Loan Fund (interest rates 3.25% to 10.50%)             -                -       2,422,456
                                                                          -------------    ------------
Totals                                                                    $ 126,150,925   $ 130,896,123
                                                                          =============   =============

* Indicated a party-in-interest to the Plan.





                                       10


                                   SIGNATURES

      Pursuant to the requirements of the Securities Exchange Act of 1934, the
trustees (or other persons who administer the employee benefit plan) have duly
caused this annual report to be signed on its behalf by the undersigned
thereunto duly authorized.

                             STATE AUTO INSURANCE COMPANIES CAPITAL ACCUMULATION
                             PLAN

Date: June 24, 2004          By /s/ Steven J. Johnston
                                -----------------------------------------

                             Printed Name: Steven J. Johnston

                             Title: Sr. Vice President and CFO

                                       11

                                 EXHIBIT INDEX



Exhibit No.       Description
----------        ------------
                                                                          
    1             Consent of Independent Registered Public Accounting Firm      Included herein


                                       12