<DOCUMENT>
<TYPE>EX-99.906CERT
<SEQUENCE>4
<FILENAME>cert906.txt
<DESCRIPTION>906 CERT
<TEXT>
        CERTIFICATION PURSUANT TO RULE 30A-2(B) UNDER THE 1940 ACT AND
                      SECTION 906 OF THE SARBANES-OXLEY ACT

I,  Donald F.  Crumrine,  Director,  Chairman  of the Board and Chief  Executive
Officer  of  Flaherty  & Crumrine Preferred Income Opportunity Fund Incorporated
(the "Registrant"), certify that:

         1.     The Form N-CSR of the Registrant  (the "Report")  fully complies
                with  the   requirements  of  Section  13(a)  or  15(d)  of  the
                Securities Exchange Act of 1934, as amended; and

         2.     The information  contained in the Report fairly presents, in all
                material  respects,  the  financial  condition  and  results  of
                operations of the Registrant.


Date:    JANUARY 29, 2007              /S/ DONALD F. CRUMRINE
                                       Donald F. Crumrine, Director, Chairman of
                                       the Board and Chief Executive Officer
                                       (principal executive officer)


I, R. Eric  Chadwick,  Chief  Financial  Officer,  Treasurer  and Vice President
of  Flaherty  &  Crumrine  Preferred  Income Opportunity  Fund Incorporated (the
"Registrant"), certify that:

         1.     The Form N-CSR of the Registrant  (the "Report")  fully complies
                with  the   requirements  of  Section  13(a)  or  15(d)  of  the
                Securities Exchange Act of 1934, as amended; and

         2.     The information  contained in the Report fairly presents, in all
                material  respects,  the  financial  condition  and  results  of
                operations of the Registrant.


Date:    JANUARY 29, 2007             /S/ R. ERIC CHADWICK
                                      R. Eric Chadwick, Chief Financial Officer,
                                      Treasurer and Vice President
                                      (principal financial officer)

</TEXT>
</DOCUMENT>
