​ CHICAGO HEIGHTS, a city of Illinois in Cook co. It is on the Chicago and Eastern Illinois, the Elgin, Joliet, and Eastern, and the Michigan Central railroads. The principal industries are the manufacture of iron and steel goods, chemicals, glass, carriages, automobiles, and passenger and freight cars. It has a library and a hospital. Pop. (1910) 14,525; (1920) 19,653.