Below is a list of Calumet IA zip codes. For your research we have also included Calumet Area Code, Time Zone, UTC and the local Obrien County FIPS Code. Each Calumet Iowa zip code has a center Longitude / Latitude point (the Calumet center is -95.551200866699 / 42.946300506592). For your convenience we have also indicated if that zip code in Calumet observes Daylight Savings time.