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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,
 GUGTi825GUPIz0uZ+B5ED7z/iGLpBc+IqIXaETKKJTJV3YfCvNEONPJYa5jH2Vm2
 7RYaICg/SIZ8jn4Hki4MsQ==

<SEC-DOCUMENT>0001179110-05-007998.txt : 20050421
<SEC-HEADER>0001179110-05-007998.hdr.sgml : 20050421
<ACCEPTANCE-DATETIME>20050421142219
ACCESSION NUMBER:		0001179110-05-007998
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050419
FILED AS OF DATE:		20050421
DATE AS OF CHANGE:		20050421

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			AUMILLER ROBERT J
		CENTRAL INDEX KEY:			0001242130

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23090
		FILM NUMBER:		05764333

	BUSINESS ADDRESS:	
		STREET 1:		315 WEST WIND ROAD
		CITY:			TOWSON
		STATE:			MD
		ZIP:			21204
		BUSINESS PHONE:		4103210114

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CARROLLTON BANCORP
		CENTRAL INDEX KEY:			0000859222
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				521660951
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		15 CHARLES PLZ STE 200
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21201-3936
		BUSINESS PHONE:		4105364600

	MAIL ADDRESS:	
		STREET 1:		15 CHARLES PLAZA, SUITE 200
		STREET 2:		P O BOX 1391
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21201
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-04-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000859222</issuerCik>
        <issuerName>CARROLLTON BANCORP</issuerName>
        <issuerTradingSymbol>CRRB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001242130</rptOwnerCik>
            <rptOwnerName>AUMILLER ROBERT J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>315 WEST WIND ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>TOWSON</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21204</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>14.45</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-04-19</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>630</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>14.45</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2015-04-19</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>630</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>630</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">(1)  The option vests in three equal installments beginning on the anniversary of the date of the grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Robert J. Aumiller</signatureName>
        <signatureDate>2004-04-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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