Human Population Timeline By Sleepy_Tokens09 1804 Human population- 1 Billion 1927 Human population- 2 Billion 1960 Human population- 3 Billion 1974 Human population- 4 Billion 1987 Human population- 5 Billion 1998 Human population- 6 Billon 2010 Human population- 7 Billion 2020 Human population- 8 Billion