Below is a list of Marshalltown IA zip codes. For your research we have also included Marshalltown Area Code, Time Zone, UTC and the local Marshall County FIPS Code. Each Marshalltown Iowa zip code has a center Longitude / Latitude point (the Marshalltown center is -92.912696838379 / 42.034698486328). For your convenience we have also indicated if that zip code in Marshalltown observes Daylight Savings time.