<SUBMISSION>
<ACCESSION-NUMBER>0000891092-04-002688
<TYPE>8-K
<PUBLIC-DOCUMENT-COUNT>2
<PERIOD>20040527
<ITEMS>5
<ITEMS>7
<FILING-DATE>20040527
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>IRON MOUNTAIN INC/PA
<CIK>0001020569
<ASSIGNED-SIC>4220
<IRS-NUMBER>232588479
<STATE-OF-INCORPORATION>PA
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>8-K
<ACT>34
<FILE-NUMBER>001-13045
<FILM-NUMBER>04835765
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>745 ATLANTIC AVENUE
<CITY>BOSTON
<STATE>MA
<ZIP>02111
<PHONE>6175354766
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>745 ATLANTIC AVENUE
<CITY>BOSTON
<STATE>MA
<ZIP>02111
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>PIERCE LEAHY CORP
<DATE-CHANGED>19960807
</FORMER-COMPANY>
</FILER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>e18060_8k.txt
<DESCRIPTION>FORM 8-K
<TEXT>

                                  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): May 27, 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)

Item 5. Other Events.

      On May 27, 2004, Iron Mountain Incorporated (the "Company") announced the
authorization and approval of a three-for-two stock split effected in the form
of a dividend on the Company's Common Stock, par value $0.01 per share. Shares
of the Common Stock will be issued on June 30, 2004, to all stockholders of
record as of the close of business on June 15, 2004. For more information, see
the Company's press release, dated May 27, 2004, which is attached herewith as
Exhibit 99

Item 7. Financial Information and Exhibits.

(c) Exhibits.

EXHIBIT NO.       ITEM
99                Press release dated May 27, 2004.

<PAGE>

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: May 27, 2004


</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99
<SEQUENCE>2
<FILENAME>e18060ex99.txt
<DESCRIPTION>PRESS RELEASE
<TEXT>

                                                                      Exhibit 99

          Iron Mountain Incorporated Declares Three-for-Two Stock Split

    BOSTON, May 27 /PRNewswire-FirstCall/-- Iron Mountain Incorporated (NYSE:
IRM), the leader in records and information management services, announced
that the Company's Board of Directors, at a meeting held earlier today,
authorized and approved a three-for-two stock split effected in the form of a
dividend on the Company's Common Stock, par value $.01 per share (the "Common
Stock").  Shares of Common Stock will be issued on June 30, 2004, to all
stockholders of record as of the close of business on June 15, 2004.  Any
fractional shares resulting from the dividend will be paid in cash. The stock
split will increase Iron Mountain's total shares outstanding from
approximately 86 million to approximately 129 million.
    Richard Reese, Chairman and CEO, stated, "In making its decision to split
the stock, the Board of Directors considered the Company's solid financial
performance together with the continuing appreciation of its stock price.
This action reflects the Board's continued confidence in the long-term
performance of the business.  We also believe that the stock split will
broaden the marketability and distribution of our stock."

    About Iron Mountain
    Iron Mountain Incorporated is the world's trusted partner for outsourced
records and information management services.  Founded in 1951, the Company has
grown to service more than 200,000 customer accounts throughout the United
States, Canada, Europe and Latin America. Iron Mountain offers records
management services for both physical and digital media, disaster recovery
support services, and consulting - services that help businesses save money
and manage risks associated with legal and regulatory compliance, protection
of vital information, and business continuity challenges. For more
information, visit www.ironmountain.com.

    Contact:
     Stephen P. Golden
     Director of Investor Relations
     (617) 535-4799

SOURCE  Iron Mountain Incorporated
    -0-                             05/27/2004
    /CONTACT: Stephen P. Golden, Director of Investor Relations, Iron Mountain
Incorporated, +1-617-535-4799 /
    /Web site:  http://www.ironmountain.com/
    (IRM)

CO:  Iron Mountain Incorporated
ST:  Massachusetts
IN:  CPR FIN
SU:


</TEXT>
</DOCUMENT>
</SUBMISSION>
