All Employees: Professional and Business Services: Architectural, Engineering, and Related Services in Illinois was 50.18263 Thous. of Persons in January of 2024, 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 52.28922 in November of 2023 and a record low of 36.76503 in October of 1991. 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.