The average elevation above sea level in Chicago, Illinois is about 594 feet (181 meters).
The average elevation of Illinois is about 600 feet above sea level. The highest point in the state is Charles Mound, which reaches 1,235 feet above sea level.
28.3 inches above sea level
Rockton, Illinois is 738 feet (225 meters) above sea level
La Grange Illinois is 656 feet above sea level
667 ft above sea level
The highest point of elevation in Illinois is Charl's Mound at 1,235ft
Charles Mound, located in northwestern Illinois, has the state's highest elevation at 1,235 feet above sea level. The lowest point in Illinois is on the Mississippi River at 279 feet above sea level.
Charles Mound, located in northwestern Illinois, has the state's highest elevation at 1,235 feet above sea level.
Sterling, Illinois, has an approximate elevation of about 700 feet (213 meters) above sea level. This elevation can vary slightly depending on specific locations within the city. The area's elevation is typical for regions in northwestern Illinois, which are generally characterized by rolling terrain.
607 feet above sea level average Source: http://www.idcide.com/citydata/il/skokie.htm
The altitude of Peoria, IL is approximately 500 feet above sea level.