All Employees: Construction: Heavy and Civil Engineering Construction in Illinois was 28.90000 Thous. of Persons in January of 2020, according to the United States Federal Reserve. Historically, All Employees: Construction: Heavy and Civil Engineering Construction in Illinois reached a record high of 30.60000 in January of 2002 and a record low of 23.40000 in January of 1993. Trading Economics provides the current actual value, an historical data chart and related indicators for All Employees: Construction: Heavy and Civil Engineering Construction in Illinois - last updated from the United States Federal Reserve on March of 2024.