ELDORADO, a city of Saline county, Ill., U.S.A., in the south-eastern part of the State, on Federal highway 45, and served by the Big Four, the Illinois Central and the Louisville and Nash ville railways. The population was 5,004 in 1920; 1930 it was 4,482. It is the trade centre and shipping point for a coal-mining and farming region, and has some manufacturing industries.