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The largest payroll processor in the United States is ADP (Automatic Data Processing). As of 2023, ADP serves over one million clients across various industries, providing comprehensive payroll processing, human resources, and compliance solutions. With a workforce of more than 70,000 employees, ADP has established itself as the market leader in payroll services, holding a significant share of the industry despite competition from over 50 other providers. It is important to note that not all of ADP's clients utilize their payroll software directly, as some may use their services for other HR-related functions. ADP's extensive experience, technological innovation, and broad client base solidify its position as the largest payroll processor in the US.