<P> There is no estimation for the exact day or month the world 's population surpassed one or two billion . The points at which it reached three and four billion were not officially noted , but the International Database of the United States Census Bureau placed them in July 1959 and April 1974 respectively . The United Nations did determine , and commemorate , the `` Day of 5 Billion '' on July 11 , 1987 , and the `` Day of 6 Billion '' on October 12 , 1999 . The Population Division of the United Nations declared the `` Day of 7 Billion '' to be October 31 , 2011 . </P>
<P> There is no estimation for the exact day or month the world 's population surpassed one or two billion . The points at which it reached three and four billion were not officially noted , but the International Database of the United States Census Bureau placed them in July 1959 and April 1974 respectively . The United Nations did determine , and commemorate , the `` Day of 5 Billion '' on July 11 , 1987 , and the `` Day of 6 Billion '' on October 12 , 1999 . The Population Division of the United Nations declared the `` Day of 7 Billion '' to be October 31 , 2011 . </P>
when did the world population reach 7 billion
when did the world population reach 7 billion
October 31 , 2011
October 31 , 2011