Below is a list of Annawan IL zip codes. For your research we have also included Annawan Area Code, Time Zone, UTC and the local Henry County FIPS Code. Each Annawan Illinois zip code has a center Longitude / Latitude point (the Annawan center is -89.904800415039 / 41.396701812744). For your convenience we have also indicated if that zip code in Annawan observes Daylight Savings time.