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industrial city and port, Lake county, northwestern Indiana, U.S., adjoining Gary, Hammond, and Whiting. It is a part of the Chicago-Calumet industrialized metropolitan complex. Laid out in 1887, its industrial development was stimulated by construction of Indiana Harbor, connected with the Grand Calumet River by a 3-mile (5-km) ship canal and including an extensive system of docks. Its industries include iron and steel mills and the manufacture of railroad cars. The neighbourhood of Marktown, a community planned by the Mark Manufacturing Company in the early 20th century to house its employees, is on the National Register of Historic Places. Inc. 1889. Pop. (2000) 32,414; (2005 est.) 30,946.