The Illinois Medical District (IMD) is a special-use zoning district two miles west of the loop in  Chicago, Illinois. The IMD consists of 560 acres of medical research facilities, labs, a biotechnology business incubator, a raw development area, four major hospitals, two medical universities, and more than 40 health care related facilities. The IMD has more than 29,000 employees, 50,000 daily visitors and generates $3.4 billion]in economic opportunity. The IMD is the largest urban medical district in the United States, and has the most diverse patient population in the country.