Westchester is a village in Cook County, Illinois, United States. It is a western suburb of Chicago. The population was 16,718 at the 2010 census. The current Village President is Paul Gattuso.
The area now known as Westchester was occupied by German farmers beginning in the mid-19th century. Samuel Insull purchased the land in 1924 with plans to develop it for residential use and create an English-style town. As a result, the town's name and the majority of its street names are of English origin.
The Great Depression slowed development during the 1930s, although the population continued to grow. The town's suburban development was stimulated by its being the western terminal of Chicago's rapid transit line. The extension of the line was removed in 1951.