Below is a list of Piatt County IL zip codes. For your research we have also included Piatt County Area Code, Time Zone, UTC and the local County FIPS Code. Each Piatt County Illinois zip code has a center Longitude / Latitude point (the Piatt County center is -88.615196228027 / 39.974601745605). For your convenience we have also indicated if that zip code in Piatt County observes Daylight Savings time.