With a population approaching 700,000, Rouen's aire urbaine(metropolitan area) makes it twelfth-largest urbanized area in France. The urbanized areas of Lyon, Marseille, Lille, Nice, Bordeaux, and Nantes are significantly bigger, with populations of 900,000 or greater. Paris is in a class by itself, with an urbanized area that's home to more than 10 million.
Other urbanized areas with populations greater than half a million include Strasbourg, Grenoble, Rennes, Avignon, and Montpellier. Tours and Orléans, in the Loire Valley, are slightly smaller (about half a million each).