World Population in Billions
* 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)
Archive for the 'Population' Category
Top 20 most populous cities in the world
Rank
City
Population
Year
1.
Mumbai (Bombay), India
11,914,398
2001c
2.
São Paulo, Brazil
11,016,703
2006e
3.
Shanghai, China
10,996,500
2003e
4.
Moscow, Russia
10,101,500
2001c
5.
Seoul, South Korea
9,820,171
2005c
6.
Delhi, India
9,817,439
2001c
7.
Karachi, Pakistan
9,339,023
1998c
8.
Istanbul, Turkey
8,831,805
2000c
9.
Beijing, China
8,689,000
2001e
10.
Mexico City, Mexico
8,591,309
2000c
11.
Tokyo, Japan
8,483,050
2005p
12.
Jakarta, Indonesia
8,389,443
2000c
13.
Shenzhen, China
8,277,500
2005e
14.
New York City, U.S.
8,085,742
2003e
15.
Tehran, Iran
7,796,257
2004e
16.
Cairo, Egypt
7,629,866
2004e
17.
London, U.K.
7,429,200
2004e
18.
Lima, Peru
7,029,928
2004e
19.
Bogotá, Colombia
6,776,009
2005c
20.
Bangkok, Thailand
6,320,174
2000c