EXHIBIT 21: SUBSIDIARIES OF THE REGISTRANT WHOLLY-OWNED SUBSIDIARIES OF PAYCHEX, INC. AS OF MAY 31, 1999 Jurisdiction of Name of Subsidiaries Incorporation - ------------------------------------- --------------- Paychex Treasury Corporation New York Paychex Management Corporation New York Paychex Securities Corporation New York Rapid Payroll, Inc. California Paychex Business Solutions, Inc. Florida Paychex Agency, Inc. New York Paychex Administrative Services, Inc. Florida The names of certain 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.