Orders of magnitude (population)

To help compare different countries, cities, etc., we list here human populations in scientific notation.

1 E1 people

• 12 -- number of astronauts who have walked on the Moon's surface
• 47 -- population of Pitcairn Island

1 E2 people

• 150 -- The book The Tipping Point theorizes that this is the maximum size of any close-knit human population, such as a hunter-gatherer tribe or military company.
• 921 -- population of Vatican City (2005)

1 E3 people

• 1,503 -- death toll from sinking of the RMS Titanic
• 1,504 -- population of Tombstone, Arizona
• 2,986 -- death toll of the September 11, 2001 attacks
• 5,680 -- air and sea complement of a Nimitz-class aircraft carrier

1 E4 people

• 23,676 -- population of Stratford-upon-Avon (2001)
• 32,528 -- population of Liechtenstein (2004)
• 45,049 -- population of Charlottesville, Virginia
• 53,011 -- population of Cheyenne, Wyoming
• 64,482 -- population of Bermuda (2003)
• 86,102 -- population of Toowoomba, Queensland (2001 Census) Australia's second largest inland city.

1 E5 people

• 194,665 -- metropolitan area of Tuscaloosa, Alabama (2000)
• 227,818 -- Baton Rouge, Louisiana (2000)
• 235,932 -- metropolitan area of Roanoke, Virginia (2000)
• 240,000 -- approx. killed by the 2004 Indian Ocean tsunami
• 338,200 -- London Borough of Croydon (1998) the most populous London Borough
• >400,000 -- Estimated attendance at the Woodstock Festival in 1969.
• 442,972 -- Luxembourg (2004)
• 478,400 -- Tasmania, Australia (2003)
• 656,562 -- Austin, Texas (2000)
• 745,000 -- number of children that die each year from measles (2001 WHO estimate)

1 E6 people

• 2,575,768 -- population of the English county of the West Midlands
• 4,105,668 -- population of New Zealand (Oct 2005 estimate)
• 5,700,000 -- approximate population of metropolitan Boston, Massachusetts

1 E7 people

• 11,200,000: Approximate population of Moscow, Russia
• 16,000,000: Approximate population of the Netherlands
• 21,000,000: Approximate population of Australia (June 2007 Estimate)
• 33,000,000: Approximate population of Canada
• 60,000,000: Number of people who died in World War II

1 E8 people

• 106,202,903 -- population of Mexico (January 2005 estimate)
• 143,420,309 -- population of Russia (January 2005 estimate)
• 295,734,134 -- population of the United States (January 2005 estimate)

1 E9 people

• 1,080,264,388: population of India (January 2005 estimate)
• 1,306,313,816: population of People's Republic of China (January 2005 estimate)
• 6,355,543,400: Approximate population of Earth (January 2005 estimate)

1 E11 people

• About 100,000,000,000: all modern humans ever born (since the prehistoric age)