Springfield, Illinois was founded in 1820.
Illinois State University was founded in 1857.
Joseph Smith founded Nauvoo, Illinois on the Mississippi River.
Southern Illinois University (originally just in Carbondale, IL) was founded in 1869.
The current Deere& Company was founded in Moline, Illinois. The previous companies John Deere was involved with and founded were also founded in Moline, Ilinois and in Grand Detour, Illinois.
McKendree University (College) was founded in 1828 and is the oldest in Illinois.
Cook County, Illinois was founded January 15, 1831.