Below is a list of Williston OH zip codes. For your research we have also included Williston Area Code, Time Zone, UTC and the local Ottawa County FIPS Code. Each Williston Ohio zip code has a center Longitude / Latitude point (the Williston center is -83.341102600098 / 41.603401184082). For your convenience we have also indicated if that zip code in Williston observes Daylight Savings time.