Below is a list of Cortland IL zip codes. For your research we have also included Cortland Area Code, Time Zone, UTC and the local Dekalb County FIPS Code. Each Cortland Illinois zip code has a center Longitude / Latitude point (the Cortland center is -88.704803466797 / 41.93090057373). For your convenience we have also indicated if that zip code in Cortland observes Daylight Savings time.