<SEC-DOCUMENT>0000844779-18-000024-index.html : 20180228
<SEC-HEADER>0000844779-18-000024.hdr.sgml : 20180228
<ACCEPTANCE-DATETIME>20180228131917
ACCESSION NUMBER:		0000844779-18-000024
CONFORMED SUBMISSION TYPE:	NSAR-A
PUBLIC DOCUMENT COUNT:		5
CONFORMED PERIOD OF REPORT:	20171231
FILED AS OF DATE:		20180228
DATE AS OF CHANGE:		20180228
EFFECTIVENESS DATE:		20180228

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK MUNICIPAL BOND FUND, INC.
		CENTRAL INDEX KEY:			0000225635
		IRS NUMBER:				132896246
		STATE OF INCORPORATION:			NJ
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		NSAR-A
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-02688
		FILM NUMBER:		18649672

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		800-441-7762

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERRILL LYNCH MUNICIPAL BOND FUND INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ONE LIBERTY MUNICIPAL BOND FUND INC
		DATE OF NAME CHANGE:	19780622
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000225635
<SERIES-ID>S000002334
<SERIES-NAME>BlackRock National Municipal Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000006118
<CLASS-CONTRACT-NAME>Investor A
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000006120
<CLASS-CONTRACT-NAME>Investor C1
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000006121
<CLASS-CONTRACT-NAME>Institutional
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000038033
<CLASS-CONTRACT-NAME>Investor C
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000100249
<CLASS-CONTRACT-NAME>Service Shares
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000100250
<CLASS-CONTRACT-NAME>Class K
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000225635
<SERIES-ID>S000002335
<SERIES-NAME>BlackRock Short-Term Municipal Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000006122
<CLASS-CONTRACT-NAME>Investor A1
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000006124
<CLASS-CONTRACT-NAME>Investor C
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000006125
<CLASS-CONTRACT-NAME>Institutional
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000038034
<CLASS-CONTRACT-NAME>Investor A
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000038035
<CLASS-CONTRACT-NAME>Class K Shares
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000225635
<SERIES-ID>S000011867
<SERIES-NAME>BlackRock High Yield Municipal Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000032425
<CLASS-CONTRACT-NAME>Investor A
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000032427
<CLASS-CONTRACT-NAME>Investor C
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000032428
<CLASS-CONTRACT-NAME>Institutional
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>NSAR-A
<SEQUENCE>1
<FILENAME>answer.fil
<TEXT>
Document 1 - file: answer.fil

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77O RULE 10F-3
<SEQUENCE>2
<FILENAME>77o72.txt
<TEXT>
Document 2 - file: 77o72.txt

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77O RULE 10F-3
<SEQUENCE>3
<FILENAME>77o73.txt
<TEXT>
Document 3 - file: 77o73.txt

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77O RULE 10F-3
<SEQUENCE>4
<FILENAME>77o82.txt
<TEXT>
Document 4 - file: 77o82.txt

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77Q1 OTHR EXHB
<SEQUENCE>5
<FILENAME>77Q1aBRMuniBondFundAR.txt
<TEXT>
Document 5 - file: 77Q1aBRMuniBondFundAR.txt

</DOCUMENT>
</SEC-DOCUMENT>