( BW)(IL-AON)(AOC) Aon Dividend Announcement

    Business Editors

    CHICAGO--(BUSINESS WIRE)--Jan. 16, 2004--Aon Corporation (NYSE:
AOC) today declared a quarterly cash dividend of $0.15 per common
share. The cash dividend is payable on February 24, 2004 to common
stockholders of record at the close of business on February 10, 2004.
    Aon Corporation (www.aon.com) is a holding company that is
comprised of a family of insurance brokerage, consulting and insurance
underwriting subsidiaries.

    --30--AB/cg*

    CONTACT: Investor Contact:
             Sean O'Neill, 312-381-3983
              or
             Media Contact :
             Al Orendorff, 312-381-3153