EXHIBIT (21) SUBSIDIARIES OF REGISTRANT Registrant owns 100% of the outstanding stock of each of the following corporations: NAME STATE OF INCORPORATION ------------------------------------------- ------------------------ Harleysville Insurance Company of Ohio Ohio Harleysville-Atlantic Insurance Company Georgia Harleysville Insurance Company of New Jersey New Jersey Harleysville Preferred Insurance Company Pennsylvania Harleysville Lake States Insurance Company Michigan Mid-America Insurance Company Pennsylvania Harleysville Insurance Company Minnesota Harleysville Insurance Company of New York New York Harleysville Worcester Insurance Company Massachusetts