Johnston City is a city in Williamson County, Illinois, United States. The population was 3,348 at the 2020 census. This was a center of coal …Johnston City is a city in Williamson County, Illinois, United States. The population was 3,348 at the 2020 census. This was a center of coal mining in the early 20th century, having a peak of population in the 1920s. The mining jobs attracted many immigrants from Europe.
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