Paychex serves approximately 670,000 payroll clients as of May 31, 2019 across more than 100 locations and pays one out of every 12 American private-sector employees. The company offers an ever-growing variety of payroll and human resource products and services that help clients do what they do best — run their business. With a wide range of services – including payroll processing, retirement services, insurance, and a fully outsourced human resource solution – Paychex customizes its offering to the client's business, whether it is small or large, simple or complex.