Daily Almanac for
Sep 6, 2008
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World Population Milestones

Source: United Nations Population Division
 * 1 billion in 1804  
 * 2 billion in 1927(123 years later) 
 * 3 billion in 1960(33 years later) 
 * 4 billion in 1974(14 years later) 
 * 5 billion in 1987(13 years later) 
 * 6 billion in 1999(12 years later) 

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Population StatisticsTotal Population of the World by Decade, 1950–2050
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