All Employees: Professional and Business Services in Illinois was 940.00000 Thous. of Persons in November of 2021, according to the United States Federal Reserve. Historically, All Employees: Professional and Business Services in Illinois reached a record high of 967.50000 in November of 2018 and a record low of 550.10000 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.