It's probably because Paris, officially, is the very small hypercenter of the Parisian metropolitan area. Whereas Tokyo is the actual total metropolis. Just loo

It's probably because Paris, officially, is the very small hypercenter of the Parisian metropolitan area. Whereas Tokyo is the actual total metropolis. Just look up the population of both. Paris is 2 millions whereas Tokyo is 14 millions. If you were to consider the whole Paris metropolitan area then the population is 11 millions.