All Employees: Construction: Heavy and Civil Engineering Construction in Illinois was 22.20000 Thous. of Persons in March of 2022, according to the United States Federal Reserve. Historically, All Employees: Construction: Heavy and Civil Engineering Construction in Illinois reached a record high of 37.50000 in September of 2002 and a record low of 15.70000 in February of 1994. 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.