Gallatin, Tennessee, is a city located in the northern part of the United States, specifically in Sumner County. Its postal code is 37066. Gallatin serves as the county seat of Sumner County and is situated northeast of Nashville. It is an important trading and market center in the tobacco-growing region and has a population of 18,794.The map provided illustrates the location of Tennessee in the southern United States, shaded in green.詳情