Elevation
Highest point in Illinois
The highest point in Illinois is Charles Mound, at 1,235 feet (376 meters) above sea level. It ranks 45th among the 50 state high points.
From Confluence of Mississippi and Ohio rivers to Charles Mound
Illinois spans about 956 ft from its lowest point to its highest. A barometer carried from one to the other would fall by about 1.01 inHg, purely because there is less air overhead. Water that boils at 211 °F at the bottom boils at about 210 °F on top.
Live barometric pressure across Illinois · How pressure changes with altitude
Elevation of cities in Illinois
| City | Feet | Meters |
|---|---|---|
| Champaign, IL | 738 | 225 |
| Rockford, IL | 715 | 218 |
| Springfield, IL | 597 | 182 |
| Chicago, IL | 587 | 179 |
| Moline, IL | 577 | 176 |
| Peoria, IL | 502 | 153 |
High points of nearby states
Elevations from Wikipedia’s list of US states by elevation (USGS and NGS data, CC BY-SA).
Frequently asked questions
What is the highest elevation in Illinois?
The highest point in Illinois is Charles Mound, at 1,235 feet (376 meters) above sea level. That makes it the 45th highest state high point of the 50.
What is the lowest point in Illinois?
The lowest point is Confluence of Mississippi and Ohio rivers, at 279 ft.
What is the average elevation of Illinois?
The mean elevation of Illinois is about 600 feet (183 meters).
What is the air pressure at the top of Charles Mound?
On a standard day about 28.61 inHg (969 hPa), 96% of sea-level pressure. Water boils there at about 210 °F (99 °C).