-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 NCn1k9ugeDij7Gt/CeDyMYDHaXxbmYAPRso7e4OJj6R0yt8Bn+GjNkquAUlGaGr3
 mgfBx153hkgGrieVEDtfjw==

<SEC-DOCUMENT>0000707855-03-000025.txt : 20031001
<SEC-HEADER>0000707855-03-000025.hdr.sgml : 20031001
<ACCEPTANCE-DATETIME>20031001174218
ACCESSION NUMBER:		0000707855-03-000025
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030930
FILED AS OF DATE:		20031001

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SORCIC  TONY J
		CENTRAL INDEX KEY:			0001233025

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20050
		FILM NUMBER:		03921706

	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>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2003-09-30</periodOfReport>


    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001233025</rptOwnerCik>
            <rptOwnerName>SORCIC  TONY J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity></rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President &amp; CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>

        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2003-09-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>18</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>24.61</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9847</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>

    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Reporting person also owns 9,534.2867 shares in his 401(k) &amp; Profit Sharing Plan.
Reporting person also owns 1,834 shares in his IRA.
Wife owns 562 shares and 1,834 shares in her IRA and 11.193 shares in dividend reinvestment plan.
Sons own 1,000 shares and 131.422 shares in dividend reinvestment plan.</footnote>
    </footnotes>


    <ownerSignature>
        <signatureName>Lou Ann Birkey, Power of Attorney</signatureName>
        <signatureDate>2003-10-01</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----