Paychex Inc. is landing a second headquarters operation in north Phoenix’s Deer Valley area where it has now grown to 500 employees. The Rochester, New York-based company specializes in payroll, human resources and benefits services.

Paychex is adding as many 80 workers to its Arizona operations as part of its growth that brings the company’s total to 500. Expansion plans could bring another 300 Arizona employees to the finance and HR firm’s operations.

Christine Mackay, community and economic development director for the city of Phoenix, said there are more than 23,000 finance and financial technology workers in the Deer Valley area. That includes big operations for American Express (NYSE: AXP), Discover Financial Services (NYSE: DFS) and insurance company USAA is adding to its operations. Paychex is adding dozens of technology, sales, insurance and support workers at the expanding Phoenix base off Interstate 17 near Bell Road and Loop 101.

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