Area: 57,915 sq mi (149,997 sq km).
Population: ~ 12,850,000.
Largest cities: Chicago, Aurora, Rockford, Joliet, Naperville, Springfield, Peoria, Elgin, Waukegan, Cicero, Champaign, Bloomington, Decatur, Arlington Heights, Evanston, Schaumburg, Mount Prospect, Wheaton, Normal, Hoffman Estates, Bolingbrook, Palatine, Skokie, Des Plaines, Orland Park, Tinley Park, Oak Lawn, Berwyn, Oak Park, Downers Grove, Glenview, Belleville, Elmhurst, DeKalb, Moline, Rock Island, Hanover Park, Carpentersville, Lombard, Buffalo Grove, Urbana, Bartlett, Crystal Lake, Quincy, Streamwood, Carol Stream, Romeoville, Plainfield, Wheeling, Park Ridge.
Illinois is the 21st state in the United States, joining the union in 1818. Illinois is the most populous state in the Midwest and the fifth largest in the nation by population. Illinois is located in the Midwest region of the United States and is one of eight Canadian states and provinces in the two-country Great Lakes region of North America.
The capital of Illinois is Springfield, located in the center of the state. Despite the fact that the state's largest population center is now in the northeast,With more than 12.8 million people, Illinois is the 5th most populous state in the United States.
Famous tourist attractions: Millennium Park, Navy Pier, Willis Tower, Cloud Gate,...
Image source: @geology.com