ZIP Code 37721 is located in the county of Knox in the state of Tennessee. 37721 ZIP Code is spread between the coordinates of +36.1302488 Latitude and -83.82076111 Longitude. 37721 ZIP Code is part of the area code. There is 1 postal office in zip code 37721.
On the below highlighted section you can find the cities which the US Post Office accepts for ZIP code 37721. Always when you mail a package or a letter, be attentive to mention the preferred or acceptable cities. Using any city in the list of unacceptable cities may result in unforseen delays.