http://en.wikipedia.org/wiki/List_of_countries_by_population
Rank Country/territory/entity Population Date % of world population Source
— World 6,671,226,000 July 1, 2007 100% UN estimate
1 People's Republic of China[2] 1,321,461,000 October 23, 2007 19.81% Official Chinese Population clock
2 India[3] 1,169,016,000 17.52% UN estimate
— European Union 492,964,961 Jan 1, 2006 7.39% Eurostat
3 United States 303,203,064 October 24, 2007 4.54% Official USA Population clock
4 Indonesia 231,627,000 3.47% UN estimate
5 Brazil 187,223,000 September 29, 2007 2.81% Official Brazilian Population clock
6 Pakistan 161,488,000 October 16, 2007 2.42% Official Pakistani Population clock
7 Bangladesh 158,665,000 2.38% UN estimate
8 Nigeria 148,093,000 2.22% UN estimate
9 Russia 142,499,000 2.14% UN estimate
10 Japan 127,750,000 June 1, 2007 1.91% Official Japan Statistics Bureau estimate
11 Mexico 106,535,000 1.6% UN estimate
12 Philippines 88,706,300 July 1, 2007 1.33% Official Philippine National Statistics
13 Vietnam 87,375,000 1.31% UN estimate
14 Germany 82,314,900 Dec 31, 2006 1.23% Official Destatis estimate
15 Ethiopia 77,127,000 July 2007 1.16% Ethiopia Central Statistics Agency
16 Egypt 75,498,000 1.13% UN estimate
17 Turkey 74,877,000 1.12% UN estimate
18 Iran 71,208,000 1.07% UN estimate
19 France (including overseas France) 64,102,140 January 1, 2007 0.96% Official INSEE estimate
20 Thailand 62,828,706 Dec 31, 2006 0.94% Official Thai Statistics estimate