you are my density

[pauraque_bk]

Man, I have really looked everywhere for this. How do I find information on the demography of various places in the ancient world, like population density and such? I see the Romans invented the idea of taking a census, but where do I get the actual numbers? Did they not survive? I'm actually more interested in estimates of the population density of ancient Greece, but anything in the ballpark would do at this point...