All Employees: Professional and Business Services: Scientific Research and Development Services in Illinois was 21.90000 Thous. of Persons in January of 2022, according to the United States Federal Reserve. Historically, All Employees: Professional and Business Services: Scientific Research and Development Services in Illinois reached a record high of 44.90000 in July of 2000 and a record low of 18.70000 in February of 2017. Trading Economics provides the current actual value, an historical data chart and related indicators for All Employees: Professional and Business Services: Scientific Research and Development Services in Illinois - last updated from the United States Federal Reserve on April of 2024.