Below is a list of Walnut Hill IL zip codes. For your research we have also included Walnut Hill Area Code, Time Zone, UTC and the local Marion County FIPS Code. Each Walnut Hill Illinois zip code has a center Longitude / Latitude point (the Walnut Hill center is -89.042602539062 / 38.477699279785). For your convenience we have also indicated if that zip code in Walnut Hill observes Daylight Savings time.