LanÃ on-Provence is a commune of 7,674 people ( 2007 ) . 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 . LanÃ on-Provence ( also known as LanÃ on-de-Provence ) is a commune in the Bouches-du-Rh Ã ne department in southern France .