December 3rd of each year is designated as Illinois Statehood Day, to be observed throughout the State as a day to commemorate December 3, 1818 as the day Illinois became the 21st State to join the Union. Each year, within 10 days before Illinois Statehood Day, the Governor shall issue a proclamation announcing the recognition of Statehood Day, and designate the official events that shall be held in honor of Illinois obtaining statehood on December 3, 1818.
5 ILCS 490/195