Williamson County is a county in Illinois and is part of the Metro Lakeland area of Southern Illinois. Its largest city and county seat is Marion. As of the 2020 census, it had a population of 67,153.

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Country: United States
Inception: February 28, 1839
Website: http://www.williamsoncountyil.gov/

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Facts from Wikidata (CC0). Image by Nyttend via Wikimedia Commons (Public domain).

Williamson County

county in Illinois, United States

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