Population Mark Underscores Change, Diversity

Yailin Melissa Turcios, just 20 minutes old, is in the arms of midwife, Joni McCann.

Closing In: Yailin Melissa Turcios, just 20 minutes old, is in the arms of midwife, Joni McCann, as mother Rosa Turcios talks to relatives on the phone in South Florida Monday. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

On Tuesday morning, America's population is predicted to hit 300 million. Who are we?

Increasingly we are: a single mom; a centenarian; an immigrant from Mexico; an Asian business owner; a baby boomer; someone named Jacob or Emily. Decreasingly, we are a White Anglo-Saxon Protestant; a Northeasterner; someone from a large family; someone surrounded by waving wheat and open space.

America at 300 Million: Breaking Down the Numbers

An Informal Poll

Estimates on how many people live in the United States vary widely on the National Mall.

In 1790, the U.S. population was just shy of 4 million people. By 1915, the population had reached 100 million.

Immigration, the post-war baby boom, longer life expectancies and better medical care doubled the population by 1967. Just 33 years later, we've reached a new milestone: 300 million.

Here are just a few glimpses into American life at 100, 200, and 300 million people.

Price of a new home

2006: $290,600

1967: $24,600 ($149,147 in 2006 dollars)

1915: $3,200 ($64,158 in 2006 dollars)

Cost for a gallon of regular gas

2006: $3.04 (as of Aug. 7)

1967: 33 cents ($2 in 2006 dollars)

1915: 25 cents ($5.01 in 2006 dollars)  

Price of milk

2006: $3 gallon

1967: $1.03 gallon ($6.24 in 2006 dollars)

1915: $ .36 gallon ($7.22 in 2006 dollars)  

Cost of a first-class stamp

2006: 39 cents

1967: 5 cents

1915: 2 cents  

Number of foreign-born people

2006: 34.3 million

1967: 9.7 million

1915: 13.5 million  

Average Household Size

2006: 2.6 people

1967: 3.3 people

1915: 4.5 people  

World Population

2006: 6.5 billion

1967: 3.5 billion

1915: 1.8 billion  

Tuberculosis Death (per 100,000 population)

2006: 0.2

1967: 3.5

1915: 140.1  

Number of people age 65 and older

2006: 36.8 million

1967: 19.1 million

1915: 4.5 million

Median age of the population

2006: 36.2

1967: 29.5

1915: 24.1  

Most popular baby names for boys and girls, respectively

2006: Jacob and Emily

1967: Michael and Lisa

1915: John and Mary  

Courtesy: U.S. Census Bureau

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