1 EXHIBIT 21 SUBSIDIARIES OF FIRSTMERIT CORPORATION AS OF JANUARY 1, 1997 CORPORATION PERCENT OF OWNERSHIP First National Bank of Ohio (national banking association) 100% The Old Phoenix National Bank of Medina (national banking association) 100% EST National Bank (national banking association) 100% Peoples National Bank (national banking association) 100% Citizens National Bank (national banking association) 100% Peoples Bank, N.A. (national banking association) 100% FirstMerit Credit Life Insurance Company (Arizona corporation) 100% FirstMerit Community Development Corporation (Ohio corporation) 100% Citizens Savings Corporation of Stark County 100% Citizens Investment Corporation 100% 24