Fairmount is a census-designated place (CDP) in Hamilton County, Tennessee, United States.

Fairmont is located within the town of Signal Mountain's zip code, 37377, along with the town of Walden to the east and the community of Lone Oak to the northwest.

[7] According to the United States Census Bureau, the CDP has a total area of 5.2 square miles (13 km2), all of it land.

There were 952 housing units at an average density of 161.3 per square mile (62.3/km2).

13.1% of all households were made up of individuals, and 4.8% had someone living alone who was 65 years of age or older.