EXHIBIT 21 PEOPLES BANCORP INC. ANNUAL REPORT ON FORM 10-K FOR FISCAL YEAR ENDED DECEMBER 31, 2001 Subsidiaries of Peoples Bancorp Inc. The following are the only subsidiaries of Peoples Bancorp Inc.: Jurisdiction of Name of Subsidiary Incorporation - --------------------------------------------------------- --------------- Peoples Bank, National Association ("Peoples Bank") United States Peoples Insurance Agency, Inc. ("Peoples Insurance") Ohio Peoples Loan Services, Inc. ("PLS") Delaware PBNA, L.L.C. Delaware Peoples Investment Company Delaware Peoples Capital Corporation Delaware PEBO Capital Trust I Delaware