As of 2005, the town had an estimated population of 4,797 and a density of 33.48 persons per km2. The total area was 143.25 km2.
The status of Fuji was changed from a village to a town on October 1, 1966.
On October 1, 2005 Fuji, along the towns of Morodomi and Yamato, all from Saga District, and the village of Mitsuse, from Kanzaki District, was merged into the expanded city of Saga.
Coordinates: 33°22′26″N 130°12′30″E / 33.373793°N 130.208417°E / 33.373793; 130.208417