All Employees: Management, Scientific, and Technical Consulting Services in Illinois was 100.40000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, All Employees: Management, Scientific, and Technical Consulting Services in Illinois reached a record high of 100.40000 in January of 2023 and a record low of 26.90000 in January of 1991. Trading Economics provides the current actual value, an historical data chart and related indicators for All Employees: Management, Scientific, and Technical Consulting Services in Illinois - last updated from the United States Federal Reserve on April of 2024.