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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 MRqhCq/SoYP258zZz34LTxq4G2dzK/63x7e2EUL6cY/sxDK5U51ehWAyv8XeGLml
 ZSbS3h0EZN5xQUp2lRwlXQ==

<SEC-DOCUMENT>0000707855-03-000012.txt : 20030703
<SEC-HEADER>0000707855-03-000012.hdr.sgml : 20030703
<ACCEPTANCE-DATETIME>20030702180349
ACCESSION NUMBER:		0000707855-03-000012
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030630
FILED AS OF DATE:		20030703

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MILLER JAMES B /IL
		CENTRAL INDEX KEY:			0001233199

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20050
		FILM NUMBER:		03773215

	BUSINESS ADDRESS:	
		STREET 1:		606 SOUTH MAIN STREET
		CITY:			PRINCETON
		STATE:			IL
		ZIP:			61356
		BUSINESS PHONE:		815 875 4444

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PRINCETON NATIONAL BANCORP INC
		CENTRAL INDEX KEY:			0000707855
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		IRS NUMBER:				363210283
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		606 S MAIN ST
		CITY:			PRINCETON
		STATE:			IL
		ZIP:			61356
		BUSINESS PHONE:		8158754444
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>

<ownershipDocument>

    <documentType>4</documentType>

    <periodOfReport>2003-06-30</periodOfReport>


    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000707855</issuerCik>
        <issuerName>PRINCETON NATIONAL BANCORP INC</issuerName>
        <issuerTradingSymbol>PNBC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001233199</rptOwnerCik>
            <rptOwnerName>MILLER JAMES B /IL</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeSecurity>
        <securityTitle>
            <value>common stock</value>
        </securityTitle>
        <transactionDate>
            <value>2003-06-30</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>P</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value></value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>51</value>
            </transactionShares>
            <transactionValue>
                <value>23.42</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>6694</value>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
                <footnoteId id="F1"/>
            </directOrIndirectOwnership>
        </ownershipNature>
    </nonDerivativeSecurity>

    <footnotes>
        <footnote id="F1">Reporting person also owns 5,472.1657 shares in 401k &amp; profit sharing plan and 563.866 shares in dividend reinvestment plan.

Wife owns 8,275 shares.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Lou Ann Birkey, Power of Attorney</signatureName>
        <signatureDate>2003-07-02</signatureDate>
    </ownerSignature>

</ownershipDocument>

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