<SEC-DOCUMENT>0001193125-17-346769-index.html : 20171117
<SEC-HEADER>0001193125-17-346769.hdr.sgml : 20171117
<ACCEPTANCE-DATETIME>20171117141453
ACCESSION NUMBER:		0001193125-17-346769
CONFORMED SUBMISSION TYPE:	485BPOS
PUBLIC DOCUMENT COUNT:		37
FILED AS OF DATE:		20171117
DATE AS OF CHANGE:		20171117
EFFECTIVENESS DATE:		20171117

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:		485BPOS
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	002-57354
		FILM NUMBER:		171210551

	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

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:		485BPOS
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-02688
		FILM NUMBER:		171210552

	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>C000006119
<CLASS-CONTRACT-NAME>Investor B
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000006120
<CLASS-CONTRACT-NAME>Investor C1
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<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
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<CLASS-CONTRACT-ID>C000100250
<CLASS-CONTRACT-NAME>Class K
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<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
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<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000038034
<CLASS-CONTRACT-NAME>Investor A
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<SERIES-ID>S000011867
<SERIES-NAME>BlackRock High Yield Municipal Fund
<CLASS-CONTRACT>
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<CLASS-CONTRACT-NAME>Investor A
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<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>
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<DOCUMENT>
<TYPE>485BPOS
<SEQUENCE>1
<FILENAME>d455842d485bpos.htm
<DESCRIPTION>BLACKROCK MUNICIPAL BOND FUND, INC.
<TEXT>
Document 1 - file: d455842d485bpos.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.INS
<SEQUENCE>3
<FILENAME>bmbfi-20171026.xml
<DESCRIPTION>XBRL INSTANCE DOCUMENT
<TEXT>
Document 3 - file: bmbfi-20171026.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.SCH
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<DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
<TEXT>
Document 4 - file: bmbfi-20171026.xsd

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<TYPE>EX-101.CAL
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Document 5 - file: bmbfi-20171026_cal.xml

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Document 6 - file: bmbfi-20171026_def.xml

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Document 10 - file: BarChart1.png

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Document 11 - file: R2.htm

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Document 12 - file: R9.htm

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Document 14 - file: R10.htm

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Document 16 - file: BarChart3.png

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Document 17 - file: R18.htm

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Document 18 - file: R25.htm

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Document 19 - file: BarChart4.png

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Document 20 - file: R26.htm

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Document 35 - file: Show.js

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Document 36 - file: report.css

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Document 38 - RAW XML: FilingSummary.xml

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