Decherd is a city in Franklin County, Tennessee, United States. The population was 2,379 at the 2020 census and 2,361 at the 2010 cens…Decherd is a city in Franklin County, Tennessee, United States. The population was 2,379 at the 2020 census and 2,361 at the 2010 census. Peter Decherd came to the area in 1831 from Franklin County, Virginia and set up a plantation in Winchester TN that came to be known as Hundred Oaks. In the 1850s he granted right-of-way to the Nashville and Chattanooga Railroad from property he owned.