Below is a list of Oakdale IA zip codes. For your research we have also included Oakdale Area Code, Time Zone, UTC and the local Johnson County FIPS Code. Each Oakdale Iowa zip code has a center Longitude / Latitude point (the Oakdale center is -91.603202819824 / 41.706298828125). For your convenience we have also indicated if that zip code in Oakdale observes Daylight Savings time.