Below is a list of Farmington IL zip codes. For your research we have also included Farmington Area Code, Time Zone, UTC and the local Fulton County FIPS Code. Each Farmington Illinois zip code has a center Longitude / Latitude point (the Farmington center is -90.005798339844 / 40.69820022583). For your convenience we have also indicated if that zip code in Farmington observes Daylight Savings time.