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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,
 MIYuiaVbMI8pHJft42su2918WmGKQuvXjIaxI3o7Urq00GVOOzSHqixgqQO4to/t
 UjR2stFyoL3GrY57j+fGxw==

<SEC-DOCUMENT>0001253467-10-000007.txt : 20100121
<SEC-HEADER>0001253467-10-000007.hdr.sgml : 20100121
<ACCEPTANCE-DATETIME>20100121154831
ACCESSION NUMBER:		0001253467-10-000007
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100120
FILED AS OF DATE:		20100121
DATE AS OF CHANGE:		20100121

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			RINN RUSSELL B
		CENTRAL INDEX KEY:			0001186730

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-04304
		FILM NUMBER:		10538910

	MAIL ADDRESS:	
		STREET 1:		205 S HEIDEKE STREET
		CITY:			SEGUIN
		STATE:			TX
		ZIP:			78155

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COMMERCIAL METALS CO
		CENTRAL INDEX KEY:			0000022444
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES  ROLLING MILLS (COKE OVENS) [3312]
		IRS NUMBER:				750725338
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0831

	BUSINESS ADDRESS:	
		STREET 1:		6565 N. MACARTHUR BLVD., SUITE 800
		STREET 2:		P O BOX 1046
		CITY:			IRVING
		STATE:			TX
		ZIP:			75039
		BUSINESS PHONE:		2146894300

	MAIL ADDRESS:	
		STREET 1:		6565 N. MACARTHUR BLVD., SUITE 800
		STREET 2:		PO BOX 1046
		CITY:			IRVING
		STATE:			TX
		ZIP:			75039
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-01-20</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000022444</issuerCik>
        <issuerName>COMMERCIAL METALS CO</issuerName>
        <issuerTradingSymbol>CMC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001186730</rptOwnerCik>
            <rptOwnerName>RINN RUSSELL B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6565 N. MACARTHUR BLVD.</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 800</rptOwnerStreet2>
            <rptOwnerCity>IRVING</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75039</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle>EVP CMC &amp; Pres. CMC Americas</officerTitle>
            <otherText>EVP CMC &amp; Pres. CMC Americas</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-01-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>400</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>10.58</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>125109</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>40000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>by Partnership</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">This Form 4 being filed to report shares purchased under Company's General Employee Stock Purchase Plan.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: Russell B. Rinn  For: Rebecca N. Heffington</signatureName>
        <signatureDate>2010-01-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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