The Illinois Medical District (IMD) is a special-use zoning district two miles west of the Loop in Chicago, Illinois. The Illinois Medical District 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 Illinois Medical District is the largest medical district in North America, and has the most diverse patient population on the continent.