EXHIBIT 21 SUBSIDIARIES OF REGISTRANT STATE/PROVINCE OF NAME INCORPORATION Cintas Corporation - East Coast Massachusetts Cintas Corporation - Ohio Ohio Cintas Corporation No. 1 Ohio Cintas Corp. No. 5 Michigan Cintas Corp. No. 13 Pennsylvania Cintas Corporation No. 41 Maryland Cintas Sales Corporation Ohio Cintas Corp. No. 45 North Carolina Corporate Business Services, Inc. Illinois Cintas - R.U.S., Inc. South Carolina Cintas Cleaning Services, Inc. Ohio Cintas Executive Services, Inc. Nevada Cintas Canada Limited Ontario, Canada Cintas Investment Corp. Ontario, Canada 910946 Ontario, Inc. Ontario, Canada Respond Industries, Incorporated Colorado American First Aid Company Maryland 1202327 Ontario, Inc. Ontario, Canada Benjamin's Uniforms, Inc. Wisconsin Petragon, Inc. Kansas Custom Uniform Rental, Inc. Florida Uniforms To You and Company Illinois UTY Canada, LTD. Quebec, Canada Affirmed Medical, Inc. California NCAVANS, Inc. California SanDVans, Inc. California Phase VI Corporation Ohio Ontario Dust Control Limited Ontario, Canada Ontario Dust Control Corporation Ontario, Canada Ludwig Cleaners, Ltd. Alberta, Canada Lumont Services, Ltd. British Columbia, Canada