London is the most populous city in the European Union[6] with an official population of 7.5 million. It has a metropolitan area population of between 12 and 15 million, depending on the varying definitions used.
http://en.wikipedia.org/wiki/London
Paris has an estimated population of 2,153,600 inhabitants within city limits (2005 est.).[2] The Paris urban area has a population of 9.93 million;[3] a vast commuter belt around the same completes the Paris "aire urbaine" (roughly: "metropolitan area") that, with its population of 11.5 million,[4] is one of the most populated areas of its kind in Europe.[5]
http://en.wikipedia.org/wiki/Paris