In the country of Macau, the population density is one person for
every 441 square feet. If the people were all evenly spaced, they
would each have a square 21 feet on a side. But I wonder how it really
breaks down. There must be unlivable places and places such as parks
and public buildings, which would increase the actual density. On the
other hand, there must be multistory buildings, so some people will
live above others, reducing the density.
But this isn't the most crowded place on earth. In a place called Mong
Kok, in Hong Kong, the population density is 652,910 people per square
mile. This is 42 square feet per person, or a box 6 feet long and 7
feet wide. If all the people came out on the streets at once, such as
during an earthquake, there will not be enough room to stand.
104 people lived in one room of one house in this city. Four more
lived on the roof of that house.
- from the Travel section of www.odd-info.com