    <SEC-DOCUMENT>0001193125-20-153224-index.html : 20200527
    <SEC-HEADER>0001193125-20-153224.hdr.sgml : 20200527
    <ACCEPTANCE-DATETIME>20200527171255
    ACCESSION NUMBER:		0001193125-20-153224
    CONFORMED SUBMISSION TYPE:	N-2/A
    PUBLIC DOCUMENT COUNT:		20
    FILED AS OF DATE:		20200527
    DATE AS OF CHANGE:		20200527

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BLACKROCK MUNIASSETS FUND, INC.
    		CENTRAL INDEX KEY:			0000901243
    		IRS NUMBER:				223239638
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		N-2/A
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-236891
    		FILM NUMBER:		20916209

    	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:	MUNIASSETS FUND INC
    		DATE OF NAME CHANGE:	19930714

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	MUNIINCOME FUND INC
    		DATE OF NAME CHANGE:	19930517

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BLACKROCK MUNIASSETS FUND, INC.
    		CENTRAL INDEX KEY:			0000901243
    		IRS NUMBER:				223239638
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		N-2/A
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-07642
    		FILM NUMBER:		20916208

    	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:	MUNIASSETS FUND INC
    		DATE OF NAME CHANGE:	19930714

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	MUNIINCOME FUND INC
    		DATE OF NAME CHANGE:	19930517
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-2/A
    <SEQUENCE>1
    <FILENAME>d872457dn2a.htm
    <DESCRIPTION>N-2/A
    <TEXT>
    Document 1 - file: d872457dn2a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(E)
    <SEQUENCE>2
    <FILENAME>d872457dex99e.htm
    <DESCRIPTION>AUTOMATIC DIVIDEND REINVESTMENT PLAN
    <TEXT>
    Document 2 - file: d872457dex99e.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(G)(2)
    <SEQUENCE>3
    <FILENAME>d872457dex99g2.htm
    <DESCRIPTION>AMENDED AND RESTATED MASTER ADVISORY FEE WAIVER AGREEMENT
    <TEXT>
    Document 3 - file: d872457dex99g2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(G)(3)
    <SEQUENCE>4
    <FILENAME>d872457dex99g3.htm
    <DESCRIPTION>AMENDMENT NO. 1 TO AMENDED AND RESTATED MASTER ADVISORY FEE WAIVER AGREEMENT
    <TEXT>
    Document 4 - file: d872457dex99g3.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(I)
    <SEQUENCE>5
    <FILENAME>d872457dex99i.htm
    <DESCRIPTION>BLACKROCK FIXED-INCOME COMPLEX AMENDED AND RESTATED DEFERRED COMPENSATION PLAN
    <TEXT>
    Document 5 - file: d872457dex99i.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(J)
    <SEQUENCE>6
    <FILENAME>d872457dex99j.htm
    <DESCRIPTION>FORM OF MASTER CUSTODIAN AGREEMENT
    <TEXT>
    Document 6 - file: d872457dex99j.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(K)(1)
    <SEQUENCE>7
    <FILENAME>d872457dex99k1.htm
    <DESCRIPTION>FORM OF TRANSFER AGENCY AND SERVICE AGREEMENT
    <TEXT>
    Document 7 - file: d872457dex99k1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(K)(2)
    <SEQUENCE>8
    <FILENAME>d872457dex99k2.htm
    <DESCRIPTION>FORM OF ADMINISTRATION AND ACCOUNTING SERVICES AGREEMENT
    <TEXT>
    Document 8 - file: d872457dex99k2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(K)(3)
    <SEQUENCE>9
    <FILENAME>d872457dex99k3.htm
    <DESCRIPTION>SIXTH AMENDED AND RESTATED SECURITIES LENDING AGENCY AGREEMENT
    <TEXT>
    Document 9 - file: d872457dex99k3.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(L)
    <SEQUENCE>10
    <FILENAME>d872457dex99l.htm
    <DESCRIPTION>OPINION AND CONSENT OF COUNSEL TO THE REGISTRANT
    <TEXT>
    Document 10 - file: d872457dex99l.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(N)
    <SEQUENCE>11
    <FILENAME>d872457dex99n.htm
    <DESCRIPTION>INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM CONSENT
    <TEXT>
    Document 11 - file: d872457dex99n.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(R)
    <SEQUENCE>12
    <FILENAME>d872457dex99r.htm
    <DESCRIPTION>CODE OF ETHICS OF THE REGISTRANT AND THE ADVISOR
    <TEXT>
    Document 12 - file: d872457dex99r.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g8724571.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g8724571.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g8724572.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g8724572.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g8724573.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g8724573.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>g8724574.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g8724574.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g872457g06t81.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g872457g06t81.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>g872457g28h44.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g872457g28h44.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>g872457g64k79.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: g872457g64k79.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>g872457g95v41.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: g872457g95v41.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>