Lanark is a city in Carroll County, Illinois, United States. The population was 1,504 at the 2020 census, down from 1,584 at the 2010 census. …Lanark is a city in Carroll County, Illinois, United States. The population was 1,504 at the 2020 census, down from 1,584 at the 2010 census. The city was named after Lanark, in Scotland.
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