Below is a list of Charter Oak IA zip codes. For your research we have also included Charter Oak Area Code, Time Zone, UTC and the local Crawford County FIPS Code. Each Charter Oak Iowa zip code has a center Longitude / Latitude point (the Charter Oak center is -95.594100952148 / 42.070201873779). For your convenience we have also indicated if that zip code in Charter Oak observes Daylight Savings time.