Below is a list of Keithsburg IL zip codes. For your research we have also included Keithsburg Area Code, Time Zone, UTC and the local Mercer County FIPS Code. Each Keithsburg Illinois zip code has a center Longitude / Latitude point (the Keithsburg center is -90.935302734375 / 41.100498199463). For your convenience we have also indicated if that zip code in Keithsburg observes Daylight Savings time.