Geographic reference
Jefferson County, Illinois
Jefferson County is a county or county-equivalent in Illinois.
Reference details
- State
- Illinois (IL)
- Census GEOID
- 17081
- Land area
- 1,479.496 km²
- Water area
- 32.544 km²
- Representative point
- 38.30166, -88.924236
View point on map ↗
Geographic facts: 2026 U.S. Census Gazetteer. Coordinates identify a representative point, not the full geographic boundary.