<Page>

===============================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                    FORM 18-K




                                  ANNUAL REPORT

                                     of the

                                 CITY OF NAPLES
                               (Comune di Napoli)
                  (a Municipality within the Republic of Italy)
                              (Name of registrant)




             Date of the end of last fiscal year: December 31, 2003


                              SECURITIES REGISTERED
                      (As of the close of the fiscal year)

<Table>
<Caption>
========================================= ======================================= ======================================
                                               Amount as to which registration           Names of Exchanges on which
            Title of Issues                            is effective                            registered
- ----------------------------------------- --------------------------------------- --------------------------------------
                                                                            
          7.52% Notes due 2006                         $195,000,000                      New York Stock Exchange
========================================= ======================================= ======================================
</Table>


  Name and Address of Person Authorized to Receive Notices and Communications
              from the Securities and Exchange Commission:


                              Mr. Donald J. Puglisi
                              Puglisi & Associates
                          850 Library Avenue, Suite 204
                                  P.O. Box 885
                             Newark, Delaware 19715
                                     U.S.A.


===============================================================================




<Page>



The information set forth below is to be furnished:

1.  In respect of each issue of securities of the registrant registered,
    a brief statement as to:

    (a)  The general effect of any material modifications, not previously
         reported, of the rights of the holders of such securities.

    There have been no such modifications.

    (b)  The title and material provisions of any law, decree or
         administrative action, not previously reported, by reason of
         which the security is not being serviced in accordance with
         the terms thereof.

    No such provisions.

    (c)  The circumstances of any other failure, not previously reported, to
         pay principal, interest, or any sinking fund or amortization
         installment.

    No such failure.

2.  A statement as of the close of the last fiscal year of the registrant
    giving the total outstanding of:

    (a)  Internal funded debt of the registrant. (Total to be stated in
         the currency of the registrant. If any internal funded debt is
         payable in a foreign currency it should not be included under
         this paragraph (a), but under paragraph (b) of this item.)

    Reference is made to page 26 of Exhibit A.

    (b)  External funded debt of the registrant. (Totals to be stated
         in the respective currencies in which payable. No statement
         need be furnished as to intergovernmental debt).

    As of December 31, 2003 the registrant had no external funded debt
    (see "Debt of the City" on page 26 of Exhibit A).

3.  A statement giving the title, date of issue, date of maturity, interest
    rate and amount outstanding, together with the currency or currencies
    in which payable, of each issue of funded debt of the registrant
    outstanding as of the close of the last fiscal year of the registrant.

    Reference is made to page 53 of Exhibit A.

4.  (a)  As to each issue of securities of the registrant which is
         registered, there should be furnished a break-down of the total amount
         outstanding, as shown in Item 3, into the following:

         (1)  Total amount held by or for the account of the registrant.

         Not applicable.

         (2)  Total estimated amount held by nationals of the registrant (or
              if registrant is other than a national government by the
              nationals of its national government); this estimate need be
              furnished only if it is practicable to do so.

         Not applicable.

         (3)  Total amount otherwise outstanding.

         Not applicable.

    (b)  If a substantial amount is set forth in answer to paragraph (a)(1)
         above, describe briefly the method employed by the registrant to
         reacquire such securities.

         Not applicable.

5.  A statement as of the close of the last fiscal year of the registrant
    giving the estimated total of:




                                        2



<Page>



    (a)  Internal floating indebtedness of the registrant. (Total to be
         stated in the currency of the registrant).

    Reference is made to pages 26 through 27 of Exhibit A.

    (b)  External floating indebtedness of the registrant. (Total to be stated
         in the respective currencies in which payable).

    As of December 31, 2003, the registrant had no external floating
    indebtedness.

6.  Statements of the receipts, classified by source, and of the
    expenditures, classified by purpose, of the registrant for each fiscal
    year of the registrant ended since the close of the latest fiscal year
    for which such information was previously reported. These statements
    should be so itemized as to be reasonably informative and should cover
    both ordinary and extraordinary receipts and expenditures; there should
    be indicated separately, if practicable, the amount of receipts pledged
    or otherwise specifically allocated to any issue registered, indicating
    the issue.

    Reference is made to pages 16 through 25 of Exhibit A.

7.  (a) If any foreign exchange control, not previously reported, has been
        established by the registrant describe such foreign exchange control.

        Not applicable.

    (b) If any foreign exchange control previously reported has been
        discontinued or materially modified, briefly describe the effect of
        any such action, not previously reported.

        Not applicable.

                                    EXHIBITS

This annual report comprises:

    (a)  Pages numbered 1 to 4 consecutively.

    (b)  The following exhibits:

         Exhibit (A)       Current City of Naples Description.

         Exhibit (B)       None.

         Exhibit (C)       Copy of the City of Naples' budget for
                           the year ended December 31, 2004, as
                           approved by the City Council on May 7, 2004.

This annual report is filed subject to the Instructions for Form 18-K for
Foreign Governments and Political Subdivisions thereof.






                                        3




<Page>



                                    SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this annual report to be signed on its behalf by the
undersigned, thereunto duly authorized, in Naples, on the 14th day of June,
2005.

                                            City of Naples


                                       By:  /s/ Dott. Enrico CARDILLO
                                       Dott. Enrico CARDILLO
                                       Assessore alle Risorse Strategiche






                                        4





<Page>



                                  EXHIBIT INDEX

<Table>
<Caption>
                                                                  Page
                                                                  ----
                                                               
EXHIBIT A.........................................................   7
EXHIBIT C.........................................................  54
</Table>





                                        5