According to the United States Census Bureau, the town has a total area of 0.5 square miles (1.2 km²), all of it land.
There were 167 households out of which 25.7% had children under the age of 18 living with them, 50.9% were married couples living together, 9.0% had a female householder with no husband present, and 37.1% were non-families. 35.3% of all households were made up of individuals and 13.2% had someone living alone who was 65 years of age or older. The average household size was 2.24 and the average family size was 2.91.
In the town the population was spread out with 19.7% under the age of 18, 9.5% from 18 to 24, 26.1% from 25 to 44, 28.1% from 45 to 64, and 16.6% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 109.1 males. For every 100 females age 18 and over, there were 107.9 males.
The median income for a household in the town was $27,188, and the median income for a family was $40,000. Males had a median income of $30,417 versus $15,556 for females. The per capita income for the town was $16,235. About 8.2% of families and 15.6% of the population were below the poverty line, including 3.4% of those under age 18 and 18.3% of those age 65 or over.
The Bell Buckle area was settled in the early 1800s. A bustling town grew up after the Nashville and Chattanooga Railroad came through the area in 1852. A railroad depot was built in 1853 and the town was incorporated in 1856. Bell Buckle had its period of greatest prosperity after about 1870, becoming the major stockyard between Nashville and Chattanooga and growing to a population of more than 1,000.
A proud member of Tennessee Backroads, Bell Buckle has the distinction of being the smallest town in Tennessee to be a Tree City USA. Bell Buckle is the home of The Webb School (which relocated from Culleoka in 1886), a college preparatory boarding and day school which plays an integral part in the ambiance of the town.
Bell Buckle is home to the annual RC Cola and Moon Pie Festival.