Geographic reference
Johnson County, Illinois
Johnson County is a county or county-equivalent in Illinois.
Reference details
- State
- Illinois (IL)
- Census GEOID
- 17087
- Land area
- 890.275 km²
- Water area
- 12.813 km²
- Representative point
- 37.460772, -88.882114
View point on map ↗
Geographic facts: 2026 U.S. Census Gazetteer. Coordinates identify a representative point, not the full geographic boundary.