Some of the confusion about the lists Artkansas put up is that the definition of city isn't provided. So one list may vary considerable from another.
I recall a while back trying to get a handle on population density in US and European cities. I found about 6-8 lists and found that none of them seemed to agree. One would look at New York as a cosmopolitan center, while another would break it up into boroughs.
Luckily, I found some Wikipedia lists that also included a great number of footnotes to qualify the data. I know quite a few people who crap on Wikipedia, but I myself rather like the concept.