Im not sure what you mean by CO but that idiot that said that only 5 million lived in Russia is BS. Russia's population is around 150 million.
Aproximately 12,354,232 people live in belgium.
5 431 747 as per 2009 estimates.
1,330,141,000 people are approximately living in China. The population of Beijing is about 17 million. (The 2007 population estimate for the population of Beijing was 16,330,000)