Ла-Рош-сюр-Йон
The population data in the table and graph below refer to the commune of La Roche-sur-Yon proper, in its geography at the given years. The commune of La Roche-sur-Yon absorbed the former communes of Le Bourg-sous-la-Roche-sur-Yon and Saint-André-d'Ornay in 1964.