All Employees: Scientific Research and Development Services in Illinois was 22.50000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, All Employees: Scientific Research and Development Services in Illinois reached a record high of 42.30000 in January of 2001 and a record low of 19.00000 in January of 2017. Trading Economics provides the current actual value, an historical data chart and related indicators for All Employees: Scientific Research and Development Services in Illinois - last updated from the United States Federal Reserve on April of 2024.