Illinois is one of the most populous states of United States of American and is located in the Middle West (Midwest). With its 12,419,293 inhabitants, is the most populous state in the Midwest and the fifth most populous country. Nearly 65% of the state's population lives in metropolitan Chicago, one of the largest industrial and financial world, the second largest industrial center, just behind Los Angeles and the second-largest financial center the United States, only behind New York.

Illinois is the second most populous state of USA and has a highly diversified economy, being one of the major financial centers of United States, and a highly industrialized state. Geographically, Illinois is known for its rugged terrain just in general and its volatile weather. Agriculture is an important source of revenue for Illinois. Tourism and the provision of transport and telecommunications are other sources of revenue in the state. Chicago is one of the rail and airport facilities more dynamic United States.