Thorn Hill, TN is a city located in Grainger County, Tennessee and has a land area of 71.86 square miles (186.12 km2). The water area for the city is 1.02 square miles or 2.64 km2. There is one unique zip code in Thorn Hill, Tennessee and it is 37881. The area code(s) for Thorn Hill is 865.
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