[anrakushi]

there was one fact i left out, and that was area. the population density is based on the 大阪市 population and not that of the metropolitan area which mind you includes kobe and kyoto, nuts if you ask me but makes sense since as you said you can't even notice you leave one city and enter the next.

anyway Osaka city itself is:
2,636,257 people over an area of 222.11km² which gives a density of 11,869/km²

Tokyo-to which is the whole metropolitan area has to population of
12,790,000 but it is over a much larger area of 2,187.08km² giving a density of 5796 /km² (but i work it out at 5847.97/km² probably because they are using a more exact population figure rather than the rounded one)

so there we go... interesting i think anyway.