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Williamson County
Also known as Williamson County, Illinois, Williamson County, IL
county in Illinois, United States
Key facts
- Country
- United States
- State
- Illinois
- Founded
- February 28, 1839
- Named after
- Williamson County, Tennessee
- Seat
- Marion
- Largest city
- Marion
- Total
- 444 sq mi (1,150 km )
- Land
- 420 sq mi (1,100 km )
- Water
- 24 sq mi (62 km ) 5.4%
- Estimate 2025
- 67,225
- Density
- 160/sq mi (62/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
~11 min read
Article
Williamson County is a county in Illinois. At the 2020 census, it had a population of 67,153. Its largest city and county seat is Marion. Williamson County is part of the Metro Lakeland area of Southern Illinois.
History
