Been a while since Geography class and forgot the US was higher than you might think. Of course the first two are 1/3 the population.
http://en.wikipedia.org/wiki/List_of..._by_population
For their land area, Nigeria and Pakistan are getting crowded. Japan and Vietnam are already very crowded.
Countries with large-scale population DECLINE: former Soviet Republics and Eastern European countries.
"One of many houses that have fallen into disrepair near the village of Dalekushi, Russia, July 21, 2009.
Russia as a whole lost 12.3 million people from 1992 to 2008"
Nobody Home: The Countries Where Population Is on the Decline
http://www.time.com/time/specials/pa...097841,00.html