Winnetka () is a village in Cook County, Illinois, United States, located 16 miles (26 km) north of downtown Chicago. The population was 12,316 as of 2019. The village is one of the wealthiest places in the nation in terms of household income: It was the second-ranked Illinois community on Bloomberg's 2019 Richest Places Annual Index.
The first houses were built in 1836. That year, Erastus Patterson and his family arrived from Vermont and opened a tavern to service passengers on the Green Bay Trail post road. The village was first subdivided in 1854 by Charles Peck and Walter S. Gurnee, President of the Chicago, Milwaukee & St. Paul Railroad. Winnetka's first private school was opened in 1856 by Mr. and Mrs. Charles Peck with seventeen pupils. In 1859, the first public school building was built with private funds at the southeast corner of Elm and Maple streets.