Below is a list of Richwood OH zip codes. For your research we have also included Richwood Area Code, Time Zone, UTC and the local Union County FIPS Code. Each Richwood Ohio zip code has a center Longitude / Latitude point (the Richwood center is -83.296897888184 / 40.427600860596). For your convenience we have also indicated if that zip code in Richwood observes Daylight Savings time.