<SEC-DOCUMENT>0001752724-19-142108-index.html : 20191011
<SEC-HEADER>0001752724-19-142108.hdr.sgml : 20191011
<ACCEPTANCE-DATETIME>20191011135245
ACCESSION NUMBER:		0001752724-19-142108
CONFORMED SUBMISSION TYPE:	N-CEN
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20190731
FILED AS OF DATE:		20191011
DATE AS OF CHANGE:		20191011
EFFECTIVENESS DATE:		20191011

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK MUNIYIELD INVESTMENT QUALITY FUND
		CENTRAL INDEX KEY:			0000891188
		IRS NUMBER:				223196058
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		N-CEN
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-07156
		FILM NUMBER:		191147845

	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:	BLACKROCK MUNIYIELD INSURED INVESTMENT FUND
		DATE OF NAME CHANGE:	20080926

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK MUNIYIELD FLORIDA INSURED FUND
		DATE OF NAME CHANGE:	20070611

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MUNIYIELD FLORIDA INSURED FUND /NJ/
		DATE OF NAME CHANGE:	19921217
</SEC-HEADER>
<DOCUMENT>
<TYPE>N-CEN
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
Document 1 - file: primary_doc.html

Document 1 - RAW XML: primary_doc.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>INTERNAL CONTROL RPT
<SEQUENCE>2
<FILENAME>NCEN_11223188604638500.txt
<TEXT>
Document 2 - file: NCEN_11223188604638500.txt

</DOCUMENT>
<DOCUMENT>
<TYPE>MATERIAL AMENDMENTS
<SEQUENCE>3
<FILENAME>MFT.htm
<TEXT>
Document 3 - file: MFT.htm

</DOCUMENT>
</SEC-DOCUMENT>