EXHIBIT 21: SUBSIDIARIES OF THE REGISTRANT Jurisdiction of Name of Subsidiaries Incorporation - -------------------- --------------- Paychex Management Corporation New York Paychex Securities Corporation New York Paychex Computer Systems, Inc. California Paychex Business Solutions, Inc. Florida The Payroll Service, Inc. Illinois Paychex Agency, Inc. New York The names of particular subsidiaries have been omitted in accordance with SEC reg. S-K 601(21)(ii) because they do not, in the aggregate, constitute a "significant subsidiary" of Paychex, Inc.