<DOCUMENT>
<TYPE>EX-99.(S)
<SEQUENCE>18
<FILENAME>file017.txt
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>

<PAGE>

                               POWER OF ATTORNEY

           That each of the undersigned officers and trustees of BlackRock
Insured Municipal Income Trust, a business trust formed under the laws of the
State of Delaware (the "Trust"), do constitute and appoint Ralph L. Schlosstein,
Robert S. Kapito and Anne F. Ackerley, and each of them, his true and lawful
attorneys and agents, each with full power and authority (acting alone and
without the other) to execute in the name and on behalf of each of the
undersigned as such officer or trustee, a Registration Statement on Form N-2,
including any pre-effective amendments and/or any post-effective amendments
thereto and any subsequent Registration Statement of the Trust pursuant to Rule
462(b) of the Securities Act of 1933, as amended (the "1933 Act") and any other
filings in connection therewith, and to file the same under the 1933 Act or the
Investment Company Act of 1940, as amended, or otherwise, with respect to the
registration of the Trust, the registration or offering of the Trust's common
shares of beneficial interest, par value $.001 per share, or the registration or
offering of the Trust's preferred shares, par value $.001 per share; granting to
such attorneys and agents and each of them, full power of substitution and
revocation in the premises; and ratifying and confirming all that such attorneys
and agents, or any of them, may do or cause to be done by virtue of these
presents.

           This Power of Attorney may be executed in multiple counterparts, each
of which shall be deemed an original, but which taken together shall constitute
one instrument.



<PAGE>



           IN WITNESS WHEREOF, each of the undersigned has executed this Power
of Attorney this 20th day of September, 2002.



                                     /s/  Dr. Andrew F. Brimmer
                                     -------------------------------------
                                            Dr. Andrew F. Brimmer
                                            Trustee


                                     /s/Richard E. Cavanagh
                                     -------------------------------------
                                            Richard E. Cavanagh
                                            Trustee


                                     /s/ Kent Dixon
                                     -------------------------------------
                                            Kent Dixon
                                            Trustee


                                     /s/ Frank J. Fabozzi
                                     -------------------------------------
                                            Frank J. Fabozzi
                                            Trustee


                                      /s/ James Clayburn La Force, Jr
                                     -------------------------------------
                                            James Clayburn La Force, Jr.
                                            Trustee


                                      /s/  Walter F. Mondale
                                     -------------------------------------
                                            Walter F. Mondale
                                            Trustee


                                      /s/ Ralph L. Schlosstein
                                     -------------------------------------
                                            Ralph L. Schlosstein
                                            Trustee

                                       2
<PAGE>



                                      /s/ Robert S. Kapito
                                     -------------------------------------
                                            Robert S. Kapito
                                            Trustee and President


                                      /s/ Henry Gabbay
                                     -------------------------------------
                                            Henry Gabbay
                                            Treasurer


                                       3



</TEXT>
</DOCUMENT>
