Lowest and Highest Points in Cook County
Low elevation: <580 feet above mean sea level
Place: Lake Michigan shoreline
7.5' quadrangle name: Chicago Loop (and others)
PLSS: 3-28-40N-14E
Geology: Ravinia Formation, beach deposits
High elevation: >950 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Streamwood
PLSS: 3-18-42N-9E
Geology: West Chicago Moraine
Area: 949.20 square miles
Total relief (approximate): 370 feet
Average percent slope: 0.64%
Updated 9/29/2009 JKH