Below is a list of Belknap IL zip codes. For your research we have also included Belknap Area Code, Time Zone, UTC and the local Johnson County FIPS Code. Each Belknap Illinois zip code has a center Longitude / Latitude point (the Belknap center is -88.940902709961 / 37.322200775146). For your convenience we have also indicated if that zip code in Belknap observes Daylight Savings time.