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Kongsberg is a town and municipality in Viken county, Norway. Kongsberg is the administration center in Kongsberg municipality. The city is located on the river Numedalslågen at the entrance to the valley of Numedal. The municipality of Kongsberg was established on 1 January 1838. The rural municipalities of Ytre Sandsvær and Øvre Sandsvær were merged into the municipality of Kongsberg on 1 January 1964.