EXHIBIT 32.1 SARBANES-OXLEY ACT OF 2002, SECTION 906 CERTIFICATION OF CHIEF EXECUTIVE AND CHIEF FINANCIAL OFFICERS PART II. OTHER INFORMATION FORM 10-Q CERTIFICATION OF FINANCIAL RESULTS We, Norman L. Lowery, Vice Chairman and CEO, and Michael A. Carty, Chief Financial Officer, of First Financial Corporation, hereby individually certify the following: o This Form 10-Q fully complies with the requirements of Sections 13(a) or 15(d) of the Securities Exchange Act of 1934, and, o The information contained in the report fairly presents, in all material respects, the financial position and results of operations of First Financial Corporation as of and for the periods presented. August 8, 2003 By /s/ NORMAN L. LOWERY ------------------------------------- Norman L. Lowery Vice Chairman, & CEO August 8, 2003 By /s/ MICHAEL A. CARTY ------------------------------------- Michael A. Carty, Treasurer & CFO 19