Below is a list of Darien IL zip codes. For your research we have also included Darien Area Code, Time Zone, UTC and the local Dupage County FIPS Code. Each Darien Illinois zip code has a center Longitude / Latitude point (the Darien center is -87.9833984375 / 41.745601654053). For your convenience we have also indicated if that zip code in Darien observes Daylight Savings time.