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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%
State of Illinois | Illinois Department of Natural Resources | University of Illinois