All Employees: Professional and Business Services in Illinois was 924.50000 Thous. of Persons in January of 2021, according to the United States Federal Reserve. Historically, All Employees: Professional and Business Services in Illinois reached a record high of 948.60000 in January of 2019 and a record low of 564.40000 in January of 1991. Trading Economics provides the current actual value, an historical data chart and related indicators for All Employees: Professional and Business Services in Illinois - last updated from the United States Federal Reserve on April of 2024.