Below is a list of Houghton IA zip codes. For your research we have also included Houghton Area Code, Time Zone, UTC and the local Lee County FIPS Code. Each Houghton Iowa zip code has a center Longitude / Latitude point (the Houghton center is -91.610801696777 / 40.784698486328). For your convenience we have also indicated if that zip code in Houghton observes Daylight Savings time.