All Employees: Professional and Business Services: Administrative and Support Services in Illinois was 385.99767 Thous. of Persons in March of 2024, according to the United States Federal Reserve. Historically, All Employees: Professional and Business Services: Administrative and Support Services in Illinois reached a record high of 439.23574 in March of 2022 and a record low of 219.56156 in October of 1990. Trading Economics provides the current actual value, an historical data chart and related indicators for All Employees: Professional and Business Services: Administrative and Support Services in Illinois - last updated from the United States Federal Reserve on April of 2024.