Below is a list of De Soto IA zip codes. For your research we have also included De Soto Area Code, Time Zone, UTC and the local Dallas County FIPS Code. Each De Soto Iowa zip code has a center Longitude / Latitude point (the De Soto center is -94.012603759766 / 41.535701751709). For your convenience we have also indicated if that zip code in De Soto observes Daylight Savings time.