December 3, 2024 – Illinois 2024-12-032024-12-03Add a comment Today, the flag of Illinois flies in celebration of the state’s admission to the Union on December 3, 1818 as the 21st state of the union. Flag of Illinois Also flying is the flag of the City of Chicago. Flag of Chicago Share this: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Like Loading... Related