All Employees: Professional and Business Services: Specialized Design Services in Illinois was 6.65387 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, All Employees: Professional and Business Services: Specialized Design Services in Illinois reached a record high of 8.73459 in January of 1997 and a record low of 6.00459 in April of 2020. Trading Economics provides the current actual value, an historical data chart and related indicators for All Employees: Professional and Business Services: Specialized Design Services in Illinois - last updated from the United States Federal Reserve on April of 2024.