<SEC-DOCUMENT>0001206774-18-000706-index.html : 20180306
<SEC-HEADER>0001206774-18-000706.hdr.sgml : 20180306
<ACCEPTANCE-DATETIME>20180306155607
ACCESSION NUMBER:		0001206774-18-000706
CONFORMED SUBMISSION TYPE:	DEF 14A
PUBLIC DOCUMENT COUNT:		5
CONFORMED PERIOD OF REPORT:	20180418
FILED AS OF DATE:		20180306
DATE AS OF CHANGE:		20180306
EFFECTIVENESS DATE:		20180306

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Flaherty & Crumrine PREFERRED INCOME OPPORTUNITY FUND INC
		CENTRAL INDEX KEY:			0000882071
		IRS NUMBER:				954355600
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1130

	FILING VALUES:
		FORM TYPE:		DEF 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-06495
		FILM NUMBER:		18669807

	BUSINESS ADDRESS:	
		STREET 1:		301 E COLORADO BLVD STE 720
		STREET 2:		C/O FLAHERTY & CRUMRINE INC
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101
		BUSINESS PHONE:		(626) 795-7300

	MAIL ADDRESS:	
		STREET 1:		301 COLORADO BLVD STE 720
		STREET 2:		C/O FLAHERTY & CRUMRINE INC
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PREFERRED INCOME OPPORTUNITY FUND INC
		DATE OF NAME CHANGE:	19920929
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEF 14A
<SEQUENCE>1
<FILENAME>fandcpfo3387615-def14a.htm
<DESCRIPTION>DEFINITIVE PROXY STATEMENT
<TEXT>
Document 1 - file: fandcpfo3387615-def14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>fandcpfo3387615-def14a2.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: fandcpfo3387615-def14a2.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>fandcpfo3387615-def14a3.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: fandcpfo3387615-def14a3.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>fandcpfo3387615-def14ax.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: fandcpfo3387615-def14ax.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>fandcflc3387613-transmitx1x1.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: fandcflc3387613-transmitx1x1.jpg

</DOCUMENT>
</SEC-DOCUMENT>