Below is a list of Diagonal IA zip codes. For your research we have also included Diagonal Area Code, Time Zone, UTC and the local Ringgold County FIPS Code. Each Diagonal Iowa zip code has a center Longitude / Latitude point (the Diagonal center is -94.338203430176 / 40.812400817871). For your convenience we have also indicated if that zip code in Diagonal observes Daylight Savings time.