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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 VyBFP+bJdk5vQ5iEOKRafm+fideE+8q+miT4wzIkDJ1H/Ph/cVoCk2qkdIQKf5Nl
 POHInlFV+Q7ExG8JQXtkow==

<SEC-DOCUMENT>9999999995-06-000397.txt : 20060620
<SEC-HEADER>9999999995-06-000397.hdr.sgml : 20060620
<ACCEPTANCE-DATETIME>20060620001521
ACCESSION NUMBER:		9999999995-06-000397
CONFORMED SUBMISSION TYPE:	EFFECT
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20060619
DATE AS OF CHANGE:		20060620
EFFECTIVENESS DATE:		20060619

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MERRILL LYNCH MULTI STATE MUNICIPAL SERIES TRUST
		CENTRAL INDEX KEY:			0000774013
		IRS NUMBER:				226437104
		STATE OF INCORPORATION:			NJ
		FISCAL YEAR END:			0731

	FILING VALUES:
		FORM TYPE:		EFFECT
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-133972
		FILM NUMBER:		06914243

	BUSINESS ADDRESS:	
		STREET 1:		P O BOX 9011
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08543
		BUSINESS PHONE:		6092822800

	MAIL ADDRESS:	
		STREET 1:		BOX 9011
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08543

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERRILL LYNCH N Y MUNI BD FD OF M L MULTI ST MUNI SER TRUST
		DATE OF NAME CHANGE:	19930225

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERRILL LYNCH MULTI STATE TAX EXEMPT SERIES TRUST
		DATE OF NAME CHANGE:	19871206
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<MERGER-SERIES-AND-CLASSES-CONTRACTS>
<MERGER>
<ACQUIRING-DATA>
CENTRAL INDEX KEY:			0000774013
<SERIES>
<SERIES-ID>S000004035
<SERIES-NAME>MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND
</SERIES>
</ACQUIRING-DATA>
<TARGET-DATA>
CENTRAL INDEX KEY:			0000844779
<SERIES>
<SERIES-ID>S000001883
<SERIES-NAME>BLACKROCK PA TAX-FREE INCOME PORTFOLIO
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000004940
<CLASS-CONTRACT-NAME>INSTITUTIONAL
<CLASS-CONTRACT-TICKER-SYMBOL>CCPAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000004941
<CLASS-CONTRACT-NAME>SERVICE
<CLASS-CONTRACT-TICKER-SYMBOL>CMPAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000004942
<CLASS-CONTRACT-NAME>INVESTOR A
<CLASS-CONTRACT-TICKER-SYMBOL>PNPAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000004943
<CLASS-CONTRACT-NAME>INVESTOR B
<CLASS-CONTRACT-TICKER-SYMBOL>CPAIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000004944
<CLASS-CONTRACT-NAME>INVESTOR C
<CLASS-CONTRACT-TICKER-SYMBOL>BPACX
</CLASS-CONTRACT>
</SERIES>
</TARGET-DATA>
</MERGER>
</MERGER-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>EFFECT
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
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    <schemaVersion>X0101</schemaVersion>

    <submissionType>EFFECT</submissionType>

    <act>33</act>

    <testOrLive>LIVE</testOrLive>

    <effectiveData>
        <finalEffectivenessDispDate>2006-06-19</finalEffectivenessDispDate>
        <form>N-14</form>
        <filer>
            <cik>0000774013</cik>
            <entityName>MERRILL LYNCH MULTI STATE MUNICIPAL SERIES TRUST</entityName>
            <fileNumber>333-133972</fileNumber>
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                    <acquiringSeriesId>S000004035</acquiringSeriesId>
                    <acquiringSeriesName>Merrill Lynch Pennsylvania Municipal Bond Fund</acquiringSeriesName>
                    <targetCik>0000844779</targetCik>
                    <targetEntityName>BLACKROCK FUNDS</targetEntityName>
                    <targetSeriesId>S000001883</targetSeriesId>
                    <targetSeriesName>BLACKROCK PA TAX-FREE INCOME PORTFOLIO</targetSeriesName>
                    <targetClassContractId>C000004940</targetClassContractId>
                    <targetClassContractName>INSTITUTIONAL</targetClassContractName>
                </merger>
                <merger>
                    <acquiringCik>0000774013</acquiringCik>
                    <acquiringEntityName>MERRILL LYNCH MULTI STATE MUNICIPAL SERIES TRUST</acquiringEntityName>
                    <acquiringSeriesId>S000004035</acquiringSeriesId>
                    <acquiringSeriesName>Merrill Lynch Pennsylvania Municipal Bond Fund</acquiringSeriesName>
                    <targetCik>0000844779</targetCik>
                    <targetEntityName>BLACKROCK FUNDS</targetEntityName>
                    <targetSeriesId>S000001883</targetSeriesId>
                    <targetSeriesName>BLACKROCK PA TAX-FREE INCOME PORTFOLIO</targetSeriesName>
                    <targetClassContractId>C000004941</targetClassContractId>
                    <targetClassContractName>SERVICE</targetClassContractName>
                </merger>
                <merger>
                    <acquiringCik>0000774013</acquiringCik>
                    <acquiringEntityName>MERRILL LYNCH MULTI STATE MUNICIPAL SERIES TRUST</acquiringEntityName>
                    <acquiringSeriesId>S000004035</acquiringSeriesId>
                    <acquiringSeriesName>Merrill Lynch Pennsylvania Municipal Bond Fund</acquiringSeriesName>
                    <targetCik>0000844779</targetCik>
                    <targetEntityName>BLACKROCK FUNDS</targetEntityName>
                    <targetSeriesId>S000001883</targetSeriesId>
                    <targetSeriesName>BLACKROCK PA TAX-FREE INCOME PORTFOLIO</targetSeriesName>
                    <targetClassContractId>C000004942</targetClassContractId>
                    <targetClassContractName>INVESTOR A</targetClassContractName>
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                <merger>
                    <acquiringCik>0000774013</acquiringCik>
                    <acquiringEntityName>MERRILL LYNCH MULTI STATE MUNICIPAL SERIES TRUST</acquiringEntityName>
                    <acquiringSeriesId>S000004035</acquiringSeriesId>
                    <acquiringSeriesName>Merrill Lynch Pennsylvania Municipal Bond Fund</acquiringSeriesName>
                    <targetCik>0000844779</targetCik>
                    <targetEntityName>BLACKROCK FUNDS</targetEntityName>
                    <targetSeriesId>S000001883</targetSeriesId>
                    <targetSeriesName>BLACKROCK PA TAX-FREE INCOME PORTFOLIO</targetSeriesName>
                    <targetClassContractId>C000004943</targetClassContractId>
                    <targetClassContractName>INVESTOR B</targetClassContractName>
                </merger>
                <merger>
                    <acquiringCik>0000774013</acquiringCik>
                    <acquiringEntityName>MERRILL LYNCH MULTI STATE MUNICIPAL SERIES TRUST</acquiringEntityName>
                    <acquiringSeriesId>S000004035</acquiringSeriesId>
                    <acquiringSeriesName>Merrill Lynch Pennsylvania Municipal Bond Fund</acquiringSeriesName>
                    <targetCik>0000844779</targetCik>
                    <targetEntityName>BLACKROCK FUNDS</targetEntityName>
                    <targetSeriesId>S000001883</targetSeriesId>
                    <targetSeriesName>BLACKROCK PA TAX-FREE INCOME PORTFOLIO</targetSeriesName>
                    <targetClassContractId>C000004944</targetClassContractId>
                    <targetClassContractName>INVESTOR C</targetClassContractName>
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</TEXT>
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</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----