Below is a list of Richland County IL zip codes. For your research we have also included Richland County Area Code, Time Zone, UTC and the local County FIPS Code. Each Richland County Illinois zip code has a center Longitude / Latitude point (the Richland County center is -88.104103088379 / 38.721099853516). For your convenience we have also indicated if that zip code in Richland County observes Daylight Savings time.