Below is a list of Grainger County TN zip codes. For your research we have also included Grainger County Area Code, Time Zone, UTC and the local County FIPS Code. Each Grainger County Tennessee zip code has a center Longitude / Latitude point (the Grainger County center is -83.531799316406 / 36.283599853516). For your convenience we have also indicated if that zip code in Grainger County observes Daylight Savings time.