Below is a list of Hillside IL zip codes. For your research we have also included Hillside Area Code, Time Zone, UTC and the local Cook County FIPS Code. Each Hillside Illinois zip code has a center Longitude / Latitude point (the Hillside center is -87.894996643066 / 41.87020111084). For your convenience we have also indicated if that zip code in Hillside observes Daylight Savings time.