<SUBMISSION>
<ACCESSION-NUMBER>0001020569-07-000004
<TYPE>5
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20061231
<FILING-DATE>20070214
<DATE-OF-FILING-DATE-CHANGE>20070214
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>EBBIGHAUSEN HAROLD E
<CIK>0001183335
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>5
<ACT>34
<FILE-NUMBER>001-13045
<FILM-NUMBER>07615737
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>745 ATLANTIC AVE
<CITY>BOSTON
<STATE>MA
<ZIP>02111
<PHONE>6175354932
</BUSINESS-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>IRON MOUNTAIN INC
<CIK>0001020569
<ASSIGNED-SIC>4220
<IRS-NUMBER>232588479
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<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>IRON MOUNTAIN INC/PA
<DATE-CHANGED>20000201
</FORMER-COMPANY>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>PIERCE LEAHY CORP
<DATE-CHANGED>19960807
</FORMER-COMPANY>
</ISSUER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
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    <documentType>5</documentType>

    <periodOfReport>2006-12-31</periodOfReport>

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    <form4TransactionsReported>0</form4TransactionsReported>

    <issuer>
        <issuerCik>0001020569</issuerCik>
        <issuerName>IRON MOUNTAIN INC</issuerName>
        <issuerTradingSymbol>IRM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
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            <rptOwnerCik>0001183335</rptOwnerCik>
            <rptOwnerName>EBBIGHAUSEN HAROLD E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6 EDMUND BRIGHAM WAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WESTBOROUGH</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01581</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Pres. N.A. Service Delivery</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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    <derivativeTable>
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                <transactionPricePerShare>
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            <exerciseDate>
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            <expirationDate>
                <value>2016-05-23</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>4066</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
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            </securityTitle>
            <conversionOrExercisePrice>
                <value>24.59</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-12-29</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>12200</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F9"/>
            </exerciseDate>
            <expirationDate>
                <value>2016-05-23</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>36600</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>36600</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
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                    <value>D</value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>13.8111</value>
                <footnoteId id="F10"/>
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            <transactionDate>
                <value>2006-12-29</value>
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            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>7241</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
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            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F11"/>
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            <expirationDate>
                <value>2012-03-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </sharesOwnedFollowingTransaction>
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                    <value>D</value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
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                <value>13.8111</value>
                <footnoteId id="F12"/>
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            <transactionDate>
                <value>2006-12-29</value>
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            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>4836</value>
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                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
                <value>2012-03-20</value>
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            <underlyingSecurity>
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                <underlyingSecurityShares>
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                    <value>14509</value>
                </sharesOwnedFollowingTransaction>
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                    <value>D</value>
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                    <value></value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
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                <value>9.9629</value>
                <footnoteId id="F14"/>
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                <value>2006-12-29</value>
            </transactionDate>
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                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <transactionShares>
                    <value>14057</value>
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                <transactionPricePerShare>
                    <value>0</value>
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                    <value>A</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F15"/>
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            <expirationDate>
                <value>2009-09-12</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>42172</value>
                </underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
                    <value>42172</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>6.2716</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-12-29</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>3721</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F16"/>
            </exerciseDate>
            <expirationDate>
                <value>2007-07-30</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>11163</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>11163</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Common Stock of Iron Mountain Incorporated split, December 29, 2006 3-for-2 to record holders as of December 18, 2006, resulting in the reporting person's acquisition of 7,856 shares of Common Stock.</footnote>
        <footnote id="F2">Due to software limitations, the post stock split exercise price should be $18.5866667.</footnote>
        <footnote id="F3">This stock option was previously reported as covering 10,758 shares at an exercise price of $27.88 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. There are no shares that are vested.</footnote>
        <footnote id="F4">Due to software limitations, the post stock split exercise price should be $18.5866667.</footnote>
        <footnote id="F5">This stock option was previously reported as covering 25,110 shares at an exercise price of $27.88 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. There are 10,759 shares that are vested.</footnote>
        <footnote id="F6">Due to software limitations, the post stock split exercise price should be $28.9666667.</footnote>
        <footnote id="F7">This stock option was previously reported as covering 11,507 shares at an exercise price of $43.45 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. There are 3,451 shares that are vested.</footnote>
        <footnote id="F8">This stock option was previously reported as covering 2,711 shares at an exercise price of $36.8850 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. There are no shares that are vested.</footnote>
        <footnote id="F9">This stock option was previously reported as covering 24,400 shares at an exercise price of $36.8850 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. There are no shares that are vested.</footnote>
        <footnote id="F10">Due to software limitations, the post stock split exercise price should be $13.8111333.</footnote>
        <footnote id="F11">This stock option was previously reported as covering 14,482 shares at an exercise price of $20.7167 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. There are 14,482 shares that are vested.</footnote>
        <footnote id="F12">Due to software limitations, the post stock split exercise price should be $13.8111333.</footnote>
        <footnote id="F13">This stock option was previously reported as covering 9,673 shares at an exercise price of $20.7167 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. There are 14,501 shares that are vested.</footnote>
        <footnote id="F14">Due to software limitations, the post stock split exercise price should be $9.9629333.</footnote>
        <footnote id="F15">This stock option was previously reported as covering 28,115 shares at an exercise price of $14.9444 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. All shares are vested.</footnote>
        <footnote id="F16">This stock option was previously reported as covering 7,442 shares at an exercise price of $9.4074 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. All shares are vested.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Harold E. Ebbighausen</signatureName>
        <signatureDate>2007-02-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
