The municipality lies in the Hunsrück.
Six barrows northeast of the village make it plain that Celts settled here in antiquity. Beginning in 1794, Benzweiler lay under French rule. In 1815 it was assigned to the Kingdom of Prussia at the Congress of Vienna. Since 1946, it has been part of the then newly founded state of Rhineland-Palatinate.
These are population figures for Benzweiler (for 31 December each time):
The council is made up of 6 council members, who were elected at the municipal election held on 7 June 2009, and the honorary mayor as chairman.