Geographic reference
Williamson County, Illinois
Williamson County is a county or county-equivalent in Illinois.
Reference details
- State
- Illinois (IL)
- Census GEOID
- 17199
- Land area
- 1,088.354 km²
- Water area
- 62.456 km²
- Representative point
- 37.730353, -88.930018
View point on map ↗
Geographic facts: 2026 U.S. Census Gazetteer. Coordinates identify a representative point, not the full geographic boundary.