Kongsberg is a municipality and town at the southern end of the Numedal valley, in the county of Buskerud, Norway.
The town was founded in 1624 under the name Konings Bierg by Danish-Norwegian king Christian IV as a mining community, and was granted its royal charter of trade—amounting to official township—in 1802. Kongsberg was established as a municipality January 1, 1838. The rural municipalities of Ytre Sandsvær and Øvre Sandsvær were merged with Kongsberg January 1, 1964.
The neighbouring municipalities of Kongsberg are Flesberg to the north, Øvre Eiker and Hof to the east, Lardal, Siljan and Skien to the south, and Sauherad and Notodden to the west. Of these, the two first lie in Buskerud county like Kongsberg, while Hof and Lardal lie in Vestfold, and the others lie in Telemark. The town is divided by the river Numedalslågen, which has three waterfalls in the town itself.
Main highways are the E134, crossing Kongsberg east-west (and connected to the E18 to Oslo), and National Highway No. 40 (Riksvei 40), going north-south.
I lived and worked (FMC Subsea) in Kongsberg from October 2006 until beginning of June 2007.