Westchester Homes for Sale are some of the best in the Chicago Suburbs! Westchester is a village in Cook County, Illinois, United States and it is a western suburb of Chicago. According to the 2010 census bureau of United States total population of Westchester is 16,718. As of the 2010 census estimate the village has a total area of 3.69 square miles and all is land. Westchester is well diversified by demographically White, African American, Native American, Asian, Pacific Islander and other races people. The median income as of the 2010 census for a household in the village is $58,928, and the median income for a family is $70,313.