West Chicago is a city in DuPage County, Illinois, United States. The population was 27,086 at the 2010 census. It was formerly named Junction and later Turner, after its founder, John B. Turner, president of the Galena and Chicago Union Railroad in 1855. The city was initially established around the first junction of railroad lines in Illinois, and today is still served by the Union Pacific / West Metra service via West Chicago station.