57,918 sq mi.
The area of Illinois Caverns State Natural Area is 485,622.770688 square meters.
Illinois.
The area of Canton Lake - Illinois - is 1,015,760.9620224 square meters.
The area of Baldwin Lake - Illinois - is 8,166,556.2604032 square meters.
The area of Cedar Lake - Illinois - is 7,081,998.739200001 square meters.
The area of Otter Lake - Illinois - is 3,095,845.1631360003 square meters.
The area of Clinton Lake - Illinois - is 19.83 square kilometers.
Illinois' area is 5.30 times the area of Hawaii.
The area of Lake Galena - Illinois - is 890,308.4129280001 square meters.
There is more than one area code. See link for Illinois area codes.
Bourbonnais, Illinois, is in area code 815 and overlay code 779.
Springfield, Illinois, USA - 60.3 square miles.