Capital: Springfield(
![Star shaped icon located on map pinpointing capital. Star shaped icon located on map pinpointing capital.](https://webarchive.library.unt.edu/web/20080916192846im_/http://www.usgs.gov/state/images/icons/captial_star.gif)
)
Land Area: 55,584 sq. miles
(source: 2003 Census)
Population: 12,653,544
(source: 2003 Census estimate)
Counties: 102
(source: National Association of Counties)
Highest Point:
Charles Mound at 1,235 feet, located in the county/subdivision of Jo Daviess
(source: U.S. Geological Survey)
Lowest Point:
Mississippi River at 279 feet, located in the county/subdivision of Alexander
(source: U.S. Geological Survey)
Geographic Center:
Located in Logan County approx. 28 miles northeast of Springfield
(source: U.S. Geological Survey)