Ådal separated from Norderhov Municipality
Ådal is a valley in the municipality of Ringerike and was a 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 January 1964 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.Traditionally the Ådal parish has been divided three ways. Ytre Ådal includes  the village of Hallingby and is the site of  Hallingby school and    Hval  Church  (Hval kirke).   Øvre Ådal includes the village of  Nes, Ådal and is the site of Nes school, Ringmoen  school and  Nes Church  (Nes kirke).  Vestre Ådal is the site of  Viker Church and the  Ådal Mountains (Ådalsfjellene),  a small mountain range which stretches from Ådal to  Vassfarfoten  on the border with Vassfaret and Sør-Aurdal in Oppland.