EXHIBIT 21 OLD NATIONAL BANCORP SUBSIDIARIES OF THE REGISTRANT AS OF DECEMBER 31, 1999 Jurisdiction of Business Name Name of Subsidiary Incorporation of Subsidiary - ------------------ --------------- ------------- Old National Bank United States of America Old National Bank (Lawrenceville, Illinois) Old National Realty Company, Inc. Indiana Old National (Evansville, Indiana) Realty Company, Inc. Indiana Old National Insurance Vermont IONIC Company (Evansville, Indiana) Orange County Bank Indiana Orange County Bank (Paoli, Indiana) Old National Trust Company United States of America Old National Trust (Evansville, Indiana) Company Old National Trust Company United States of America Old National -Kentucky Trust Company- (Morganfield, Kentucky) Kentucky Old National Trust Company United States of America Old National -Illinois Trust Company- (Mt. Carmel, Illinois) Illinois ONB Finance Company Indiana ONB Finance (Terre Haute, Indiana)