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Winnetka is a village in Cook County, Illinois, United States, 16 miles (26 km) north of downtown Chicago. The population was 12,508 as of the 2026 census. The village is one of the wealthiest places in the United States in terms of household income. It was the second-ranked Illinois community on Bloomberg's 2019 Richest Places Annual Index. According to the U.S. Census Bureau, Winnetka's median household income exceeded $250,000 in 2023.