1 Exhibit 21 Ohio Casualty Corporation Subsidiaries of Registrant December 31, 1998 Name of Subsidiary State of Incorporation The Ohio Casualty Insurance Company Ohio West American Insurance Company Indiana Ohio Casualty of New Jersey, Inc. Ohio Ohio Security Insurance Company Ohio American Fire and Casualty Company Ohio Avomark Insurance Company Indiana The Ohio Life Insurance Company Ohio Ocasco Budget, Inc. Ohio Hamilton Intermediaries Ohio 75