The town of Saint Cassien is located in the Monpazier district in Dordogne.
It is a member of the Monpaziérois Community of Communes, and that of the Greater Bergerac Area.
It has 31* inhabitants on a surface area of 472 hectares.

The town’s name in Occitan is Sent Cassian: Sanctus Cassianus (Saint Cassien).

The local council elected in 2008 :
Mayor : M. RENOUX Denis
1st Deputy : MAGIMEL Gérard
2nd Deputy : GASCOU Pierre
Local Councillors : BROOKER Garreth ; LANSAC Lucien ; GASCOU Christiane ; VAYLET Emilie ; FAUVEL Roland