Below is a list of Northfield IL zip codes. For your research we have also included Northfield Area Code, Time Zone, UTC and the local Cook County FIPS Code. Each Northfield Illinois zip code has a center Longitude / Latitude point (the Northfield center is -87.757598876953 / 42.101100921631). For your convenience we have also indicated if that zip code in Northfield observes Daylight Savings time.