"Experience shows that a very populous city can rarely, if ever, be well goverened. To the size of states there is a limit, as there is to other things (plants, animals, implements), for none of these retain their natural power when they are too large or too small."
Aristotle (322 B.C.)This quote was posted on the top of a report from the Indian Census on population density.
It seems that he believes jurisdictions that are ungovernable if they grow too large.