-----BEGIN PRIVACY-ENHANCED MESSAGE-----
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,
 NatLgeDEtnUWRsA+vx+g5VqWc8M1r/JwiArAfzSS/jY245YbPGDaYNowt343yFyr
 2xFu1KQ6pVZYL8AI1/B5Tw==

<SEC-DOCUMENT>0001209191-03-015131.txt : 20030804
<SEC-HEADER>0001209191-03-015131.hdr.sgml : 20030804
<ACCEPTANCE-DATETIME>20030804113644
ACCESSION NUMBER:		0001209191-03-015131
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030731
FILED AS OF DATE:		20030804

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FNB CORP/FL/
		CENTRAL INDEX KEY:			0000037808
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		IRS NUMBER:				251255406
		STATE OF INCORPORATION:			FL
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		F.N.B. CENTER
		STREET 2:		2150 GOODLETTE ROAD NORTH
		CITY:			NAPLES
		STATE:			FL
		ZIP:			34102
		BUSINESS PHONE:		239-262-7600

	MAIL ADDRESS:	
		STREET 1:		F.N.B. CENTER
		STREET 2:		2150 GOODLETTE ROAD NORTH
		CITY:			NAPLES
		STATE:			FL
		ZIP:			34102

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FNB CORP/PA
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CITIZENS BUDGET CO
		DATE OF NAME CHANGE:	19750909

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			STRIMBU WILLIAM J
		CENTRAL INDEX KEY:			0001211257

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-08144
		FILM NUMBER:		03819559

	BUSINESS ADDRESS:	
		STREET 1:		C/O FNB CORP
		STREET 2:		2150 GOODLETTE RD. N.
		CITY:			NAPLES
		STATE:			FL
		ZIP:			34102
		BUSINESS PHONE:		2392627600

	MAIL ADDRESS:	
		STREET 1:		C/O FNB CORP
		STREET 2:		2150 GOODLETTE RD. N.
		CITY:			NAPLES
		STATE:			FL
		ZIP:			34102
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
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<?xml version="1.0"?><ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-07-31</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0000037808</issuerCik><issuerName>FNB CORP/FL/</issuerName>        <issuerTradingSymbol>FBAN</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001211257</rptOwnerCik><rptOwnerName>STRIMBU WILLIAM J</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>3500 PARKWAY ROAD</rptOwnerStreet1><rptOwnerStreet2></rptOwnerStreet2><rptOwnerCity>BROOKFIELD</rptOwnerCity><rptOwnerState>OH</rptOwnerState><rptOwnerZipCode>44403</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle>
<value>COMMON</value></securityTitle><transactionDate><value>2003-07-31</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>M</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>1453</value></transactionShares><transactionPricePerShare><value>20.03</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>1453</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeTransaction><securityTitle><value>COMMON</value></securityTitle><transactionDate><value>2003-07-31</value></transactionDate><transactionCoding><transactionFormType>4<
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urityTitle><value>Stock Options (Granted 01/20/2002)</value></securityTitle><conversionOrExercisePrice><value>24.4</value></conversionOrExercisePrice><transactionDate><value>2003-07-31</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>M</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>1562</value></transactionShares><transactionPricePerShare><footnoteId id="F3" /></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>2003-01-21</value></exerciseDate><expirationDate><value>2012-01-20</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>1562</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><share
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ootnote id="F1">Includes 2585 shares acquired as a result of a 5% stock dividend on 05/30/2003.</footnote><footnote id="F2">Includes 9.709 shares acquired as a result of a 5% stock dividend on 05/30/2003 and 3.125 shares acquired under the F.N.B. Corporation Dividend Reinvestment Plan.</footnote><footnote id="F3">This transaction is the exercise of a derivative security (stock option) and this field is currently required to be left blank.</footnote><footnote id="F4">Represents change in exercise price and number of shares obtainable upon exercise due to a 5% stock dividend on 05/30/2003.</footnote></footnotes><remarks></remarks><ownerSignature><signatureName>/s/ William J. Strimbu</signatureName><signatureDate>2003-08-04</signatureDate></ownerSignature></ownershipDocument>

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