Below is a list of Dewey IL zip codes. For your research we have also included Dewey Area Code, Time Zone, UTC and the local Champaign County FIPS Code. Each Dewey Illinois zip code has a center Longitude / Latitude point (the Dewey center is -88.280502319336 / 40.318901062012). For your convenience we have also indicated if that zip code in Dewey observes Daylight Savings time.