Geographic reference
Mason County, Illinois
Mason County is a county or county-equivalent in Illinois.
Reference details
- State
- Illinois (IL)
- Census GEOID
- 17125
- Land area
- 1,396.915 km²
- Water area
- 62.749 km²
- Representative point
- 40.238451, -89.912994
View point on map ↗
Geographic facts: 2026 U.S. Census Gazetteer. Coordinates identify a representative point, not the full geographic boundary.