Based on information in your question (where you put the answer you are seeking) and my grade school geography class, Chicago, Illinois is in the State of Illinois in the USA.
This is a matter of opinion. Trinity School is in New York City, while Fenwick High School is in Illinois.
Aurora is the 2nd most populated city in Illinois. Chicago is the largest city in Illinois.
Jericho is the worlds lowest city but if u are looking for the usa is lowest city it is death valley
Springfield is the capital city of Illinois
Yes,you are right Alton is a city in Illinois.
Yorkville is a city in Illinois. Yates City is a village in Knox County, Illinois.
Springfield is the capital city in the U.S. state of Illinois.
It was filmed at Maine North High School in Des Plaines, Illinois.
Chicago is a city in Illinois. It begins with the letter C.
Quincy Illinois is near to Kansas City, Missouri.
Blume Highschool is located in Springfield, Illinois. It is situated in the downtown area of the city.