Ådal is a valley and former municipality in Buskerud county, Norway.The municipality was created in 1857 by a split from Norderhov. At that time Ådal had a population of 2,382.On 1 January1964 Ådal was merged with Hønefoss, Tyristrand, Hole and Norderhov to form the new municipality Ringerike. Prior to the merger Ådal had a population of 3,442.
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