JOLIET, the county seat of Will county, Illinois, United States, is situated on both sides of the Des Planes river, 40 miles south-west of Chicago, with which it is connected by Manufactures of various kinds, especially of iron and steel, barbed fence wire, agricultural implements and machinery, paper, boots and shoes, cut stone, draining tiles, and sewer pipes, are extensively carried on. The coal-fields of Wilmington, Morris, and Streator are within a few miles of the city. Quarries of good building stone, and deposits of fireclay, sand, and cement gravel abound in the neighbourhood. Joilet is an important railroad centre, from which large quantities of manufactured articles, grain, cattle, and hogs are despatched daily. Population in 1880, 11,659.