Fairmont City is a village in St. Clair and Madison counties, Illinois, United States. The population was 2,265 at the 2020 census, down from 2,635 in 2010. In the 1990s Fairmont City's Hispanic population doubled, and as of 2020, over 79% of the population was of Hispanic descent.
Zip Codes in Fairmont City, IL that we also serve: 62201 62234 62071
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