Below is a list of Oskaloosa IA zip codes. For your research we have also included Oskaloosa Area Code, Time Zone, UTC and the local Mahaska County FIPS Code. Each Oskaloosa Iowa zip code has a center Longitude / Latitude point (the Oskaloosa center is -92.6003 / 41.2866). For your convenience we have also indicated if that zip code in Oskaloosa observes Daylight Savings time. For more information on Oskaloosa Iowa you will find helpful business links and searches.