KYODO — Jakarta ranked as the world's largest city with 41.9 million inhabitants followed by Dhaka, while Tokyo slipped to third against the backdrop of population growth in the developing nations and Japan's greying society, a recent United Nations (UN) report on urbanisation prospects shows.
Yeah, i think metro areas make more sense for many things. There’s the 23ku, but also the rest of (non-marintime) Tokyo pref., much of kanagawa pref., and parts of Chiba and Saitama prefs.
The daytime population of the 23ku is crazy, but not everyone lives therein.