Below is a list of De Kalb County IN zip codes. For your research we have also included De Kalb County Area Code, Time Zone, UTC and the local County FIPS Code. Each De Kalb County Indiana zip code has a center Longitude / Latitude point (the De Kalb County center is -85.028602600098 / 41.404598236084). For your convenience we have also indicated if that zip code in De Kalb County observes Daylight Savings time.