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

                                    FORM 8-K

                                 CURRENT REPORT
                       Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934

       Date of Report (Date of earliest event reported): October 28, 2004

                           IRON MOUNTAIN INCORPORATED
             (Exact name of registrant as specified in its charter)

                                  PENNSYLVANIA
                 (State or other jurisdiction of incorporation)

          1-13045                                      23-2588479
  (Commission File Number)                 (IRS Employer Identification No.)

                               745 Atlantic Avenue
                           Boston, Massachusetts 02111
          (Address of principal executive offices, including zip code)

                                 (617) 535-4766
              (Registrant's telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

|_| Written communications pursuant to Rule 425 under the Securities Act
    (17 CFR 230.425)

|_| Soliciting material pursuant to Rule 14a-12 under the Exchange Act
    (17 CFR 240.14a-12)

|_| Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
    Act (17 CFR 240.14d-2(b))

|_| Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
    Act (17 CFR 240.13e-4(c))


Item 2.02. Results of Operations and Financial Condition.

On October 28, 2004, the Company issued a press release setting forth the
Company's results of operations and financial condition for its third fiscal
quarter ended September 30, 2004. A copy of the Company's press release is
attached hereto as Exhibit 99.1 and is incorporated herein by reference.


SIGNATURES

Pursuant to the requirements 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.

                                  IRON MOUNTAIN INCORPORATED
                                  (Registrant)

                                  By:    /s/ Jean A. Bua
                                  ----------------------------------------------
                                  Name:  Jean A. Bua
                                  Title: Vice President and Corporate Controller

      Date: October 28, 2004