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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 H4nlXJ/R9nTcfrhkaDrOL4K374hZKfY2q1pLxYM2SLli2anz3gK6TwdrE279dPak
 0+3+D+4mrFsuFOirNvDRPw==

<SEC-DOCUMENT>0000943663-04-000436.txt : 20041102
<SEC-HEADER>0000943663-04-000436.hdr.sgml : 20041102
<ACCEPTANCE-DATETIME>20041102175725
ACCESSION NUMBER:		0000943663-04-000436
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20041029
FILED AS OF DATE:		20041102
DATE AS OF CHANGE:		20041102

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MEXICO FUND INC
		CENTRAL INDEX KEY:			0000065433
		IRS NUMBER:				133069854
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1031

	BUSINESS ADDRESS:	
		STREET 1:		1775 EYE STREET NW
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20006-2401
		BUSINESS PHONE:		2026263300

	MAIL ADDRESS:	
		STREET 1:		77 ARISTOTELES STREET 3RD FLOOR
		STREET 2:		POLANCO D F 11560
		CITY:			MEXICO

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			KNAUSS ROBERT L
		CENTRAL INDEX KEY:			0001045341
		STANDARD INDUSTRIAL CLASSIFICATION:	ARRANGEMENT OF TRANSPORTATION OF FREIGHT & CARGO [4731]
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-02409
		FILM NUMBER:		041114319

	BUSINESS ADDRESS:	
		STREET 1:		5151 SAN FELIPE
		STREET 2:		SUITE 1661
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77056
		BUSINESS PHONE:		7139619299

	MAIL ADDRESS:	
		STREET 1:		5151 SAN FELIPE
		STREET 2:		SUITE 1661
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77056
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-10-29</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000065433</issuerCik>
        <issuerName>MEXICO FUND INC</issuerName>
        <issuerTradingSymbol>mxf</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001045341</rptOwnerCik>
            <rptOwnerName>KNAUSS ROBERT L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE MEXICO FUND</rptOwnerStreet1>
            <rptOwnerStreet2>1775 I STREET, N.W</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20006</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-10-29</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1323</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>16.65</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5295</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Rights</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>16.65</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2004-10-29</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3972</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2004-09-24</value>
            </exerciseDate>
            <expirationDate>
                <value>2004-10-22</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>3 rights for every 1 share</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1323</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The shares listed under Item 4 of Table 1 were acquired through subscription in the issuer's one-for-three rights offering.  Shares issued pursuant to the exercise of 3,972 rights issued to Mr. Knauss were acquired on October 29, 2004.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Robert Knauss executed by Dilia Caballero pursuant to Power of Attorney</signatureName>
        <signatureDate>2004-11-02</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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