Below is a list of Westfield IL zip codes. For your research we have also included Westfield Area Code, Time Zone, UTC and the local Clark County FIPS Code. Each Westfield Illinois zip code has a center Longitude / Latitude point (the Westfield center is -87.996398925781 / 39.451999664307). For your convenience we have also indicated if that zip code in Westfield observes Daylight Savings time.