-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 CDAyebS5etNYF6qxi89CjoB6AB3w7kVk5QrX91u7DZiuQvcLCRkZWWBfwiaCTajA
 2OX4ZZhCtmzZcpZm9+B+yA==

<SEC-DOCUMENT>0000104889-10-000003.txt : 20101001
<SEC-HEADER>0000104889-10-000003.hdr.sgml : 20101001
<ACCEPTANCE-DATETIME>20101001115012
ACCESSION NUMBER:		0000104889-10-000003
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100923
FILED AS OF DATE:		20101001
DATE AS OF CHANGE:		20101001

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Weymouth Katharine
		CENTRAL INDEX KEY:			0001501808

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-06714
		FILM NUMBER:		101101281

	MAIL ADDRESS:	
		STREET 1:		1150 15TH STREET NW
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20071

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WASHINGTON POST CO
		CENTRAL INDEX KEY:			0000104889
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-EDUCATIONAL SERVICES [8200]
		IRS NUMBER:				530182885
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1150 15TH ST NW
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20071
		BUSINESS PHONE:		2023346000

	MAIL ADDRESS:	
		STREET 1:		1150 15TH ST NW
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20071
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2010-09-23</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000104889</issuerCik>
        <issuerName>WASHINGTON POST CO</issuerName>
        <issuerTradingSymbol>WPO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001501808</rptOwnerCik>
            <rptOwnerName>Weymouth Katharine</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1150 15TH STREET NW</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20071</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>75</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2625</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>729.67</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2006-12-07</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2016-12-07</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class B Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>368.56</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2008-12-15</value>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-12-15</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class B Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>426.74</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2009-12-15</value>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <value>2019-12-15</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class B Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Class B shares awarded as restricted stock under incentive plan.</footnote>
        <footnote id="F2">2,000 shares of Class B Common Stock awarded on 12/07/2006 and vest at 500 per year over four years.  1,500 shares have vested; remaining 500 shares vest on 12/07/2010.</footnote>
        <footnote id="F3">2,000 shares of Class B Common Stock awarded on 12/15/2008 and vest at 500 shares per year over four years; 500 shares vested on 12/15/2009, 500 will vest on 12/15/2010, 500 will vest on 12/15/2011, and 500 will vest on 12/15/2012.</footnote>
        <footnote id="F4">2,000 shares of Class B Common Stock awarded 12/15/2009 and vest at 500 shares per year over four years; 500 will vest on 12/15/2010, 500 will vest on 12/15/2011, 500 will vest on 12/15/2012, and 500 will vest on 12/15/2013.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Katharine Weymouth</signatureName>
        <signatureDate>2010-10-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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