All Employees: Architectural, Engineering, and Related Services in Illinois was 49.80000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, All Employees: Architectural, Engineering, and Related Services in Illinois reached a record high of 49.80000 in January of 2023 and a record low of 37.90000 in January of 1991. Trading Economics provides the current actual value, an historical data chart and related indicators for All Employees: Architectural, Engineering, and Related Services in Illinois - last updated from the United States Federal Reserve on March of 2024.