Below is a list of Winnetka IL zip codes. For your research we have also included Winnetka Area Code, Time Zone, UTC and the local Cook County FIPS Code. Each Winnetka Illinois zip code has a center Longitude / Latitude point (the Winnetka center is -87.74169921875 / 42.108299255371). For your convenience we have also indicated if that zip code in Winnetka observes Daylight Savings time.