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Gallatin, Tennessee. Gallatin is a city in and the county seat of Sumner County, Tennessee. The population was 30,678 at the 2010 census and 32,307 in 2013. Named for U.S. Secretary of the Treasury Albert Gallatin, the city was established on the Cumberland River and made the county seat of Sumner County in 1802.
An estimated 17 percent of the county is 65 or older. Gallatin County, fueled by impressive economic gains in a variety of industries, including technology and construction, gained an estimated 3,500 people from 2014 to 2015. The remarkable population spike of 3.6 percent pushed the county over 100,000 people.