Below is a list of Irwin OH zip codes. For your research we have also included Irwin Area Code, Time Zone, UTC and the local Union County FIPS Code. Each Irwin Ohio zip code has a center Longitude / Latitude point (the Irwin center is -83.492500305176 / 40.123699188232). For your convenience we have also indicated if that zip code in Irwin observes Daylight Savings time.