Below is a list of Potomac IL zip codes. For your research we have also included Potomac Area Code, Time Zone, UTC and the local Vermilion County FIPS Code. Each Potomac Illinois zip code has a center Longitude / Latitude point (the Potomac center is -87.800498962402 / 40.30530166626). For your convenience we have also indicated if that zip code in Potomac observes Daylight Savings time.