All Employees: Professional, Scientific, and Technical Services in Illinois was 445.80000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, All Employees: Professional, Scientific, and Technical Services in Illinois reached a record high of 445.80000 in January of 2023 and a record low of 260.50000 in January of 1992. Trading Economics provides the current actual value, an historical data chart and related indicators for All Employees: Professional, Scientific, and Technical Services in Illinois - last updated from the United States Federal Reserve on April of 2024.