Example image of eyePlorer eyePlorer map for 'Cook County, Illinois': County (United States) Illinois U.S. state List of the most populous counties in the United States Los Angeles County, California United States List of U.S. states and territories by population United States Census Bureau Chicago County seat Lake County, Illinois Lake Michigan Illinois General Assembly Putnam County, Illinois Daniel Pope Cook United States House of Representatives DuPage County, Illinois Cook County Board of Commissioners Todd Stroger Democratic Party (United States) George McGovern Republican Party (United States) Richard Nixon John H. Stroger, Jr. Hospital of Cook County Oak Forest Hospital of Cook County Provident Hospital (Chicago) Cook County Forest Preserves Acre Brookfield Zoo Chicago Botanic Garden Federal Bureau of Investigation Operation Greylord Sales tax Public transport Evanston, Illinois Oak Lawn Civil township Municipality Secession Abraham Lincoln Barrington Township, Cook County, Illinois Elk Grove Township, Cook County, Illinois Hanover Township, Cook County, Illinois Palatine Township, Cook County, Illinois Panhandle Schaumburg Township, Cook County, Illinois Wheeling Township, Cook County, Illinois Arlington Heights, Illinois Conservatism in the United States Illinois House of Representatives