How 2019 Sales taxes are calculated for zip code 37381. The 37381, Spring City, Tennessee, general sales tax rate is 9.75%. The combined rate used in this calculator (9.75%) is the result of the Tennessee state rate (7%), the 37381's county rate (2.75%). The Stewart, Tennessee, general sales tax rate is 7%. The sales tax rate is always 9.75%. Every 2019 combined rates mentioned above are the results of Tennessee state rate (7%), the county rate (2.75%). There is no city sale tax for Stewart. There is no special rate for Stewart. How 2019 Sales taxes are calculated for zip code 37215. The 37215, Nashville, Tennessee, general sales tax rate is 9.25%. The combined rate used in this calculator (9.25%) is the result of the Tennessee state rate (7%), the 37215's county rate (2.25%).