The economy of Flesberg is dominated by forestry and agriculture, as well as the cluster of high-tech industries in neighbouring Kongsberg.

The arms show two tømmerklaver to represent forestry – and also the letter F.[5] Flesberg Stave Church was built around the year 1250.

The area of Jondalen was transferred from Flesberg to the neighboring municipality of Kongsberg on 1 January 1964.

Most of the population lives in the four villages of Svene, Lampeland, Flesberg, and Lyngdal.

In the western part of Flesberg, the landscape rises steeply to the mountain area of Blefjell, a popular tourist destination.