All Employees: Construction: Heavy and Civil Engineering Construction in Illinois was 29.58118 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, All Employees: Construction: Heavy and Civil Engineering Construction in Illinois reached a record high of 33.11262 in September of 2002 and a record low of 22.61070 in July of 2010. 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.