Below is a list of Crystal Lake IA zip codes. For your research we have also included Crystal Lake Area Code, Time Zone, UTC and the local Hancock County FIPS Code. Each Crystal Lake Iowa zip code has a center Longitude / Latitude point (the Crystal Lake center is -93.792602539062 / 43.224098205566). For your convenience we have also indicated if that zip code in Crystal Lake observes Daylight Savings time.