Below is a list of Onslow IA zip codes. For your research we have also included Onslow Area Code, Time Zone, UTC and the local Jones County FIPS Code. Each Onslow Iowa zip code has a center Longitude / Latitude point (the Onslow center is -91.01439666748 / 42.107200622559). For your convenience we have also indicated if that zip code in Onslow observes Daylight Savings time.