Venelles is a commune of 8,156 people ( 2006 ) . It is found in the region Provence-Alpes-C Ã te d'Azur in the Bouches-du-Rh Ã ne department in the south of France . Venelles is a commune in the Bouches-du-Rh Ã ne department in southern France near Aix-en-Provence .