All Employees: Professional and Business Services: Architectural, Engineering, and Related Services in Illinois was 46.10000 Thous. of Persons in March of 2022, according to the United States Federal Reserve. Historically, All Employees: Professional and Business Services: Architectural, Engineering, and Related Services in Illinois reached a record high of 50.50000 in July of 2008 and a record low of 36.20000 in January of 1994. Trading Economics provides the current actual value, an historical data chart and related indicators for All Employees: Professional and Business Services: Architectural, Engineering, and Related Services in Illinois - last updated from the United States Federal Reserve on March of 2024.