Below is a list of Forreston IL zip codes. For your research we have also included Forreston Area Code, Time Zone, UTC and the local Ogle County FIPS Code. Each Forreston Illinois zip code has a center Longitude / Latitude point (the Forreston center is -89.579002380371 / 42.126098632812). For your convenience we have also indicated if that zip code in Forreston observes Daylight Savings time.