Hen is situated between Hønefoss and Hallingby in Ådal. Hen is located near the Hensfossen waterfall on the Ådal River (Ådalselva). Timber was floating down the Ådal River, which in the past had both a sawmill and pulp mill, both of which are now closed. Hensfoss kraftverk is a hydroelectric power plant powered by the water fall from Hensfossen. The power plant was put into operation in 1946 and modified in 1950 and 1951.
Hen Station (Hen Stasjon) on the Randsfjorden Line was opened in 1868. Sperill Line was opened for traffic from Hen to Finsand at Lake Sperillen in 1926. In 1933, it was decided to close the passenger traffic on Sperillbanen followed by the end of freight traffic in 1957. Passenger traffic on Randsfjorden Line was discontinued in 1968, which led to the Hen Station being downgraded to catering for dispatching trains and freight. 
- Hensfossen (Store norske leksikon. Ragnar Heggstad)
- Hensfoss kraftverk (Store norske leksikon. Knut A Rosvold)
- Ådalselv (Store norske leksikon. Asbjørn Vinjar)
- Hen Stasjon (Stasjonsdatabasen)
- Hen Stasjon (Hen Gjestgiveri)
- Finsand (Store norske leksikon. Geir Thorsnæs)
- Statistics Norway (2003). "Urban settlements. Population and area, by municipality. 1 January 2003". Archived from the original on 1 April 2007.
- Statistics Norway (2004). "New and omitted urban settlements. 1 January 2004". Archived from the original on 1 April 2007.
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