Demographics of the United States

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The United States has a total estimated resident population of 310,565,000.[1] It is a very urbanized population, with 82% residing in cities and suburbs as of 2008 (the worldwide urban rate is 50.5%).[2] California and Texas are the most populous states,[3] as the mean center of United States population has consistently shifted westward and southward.[4]

As of 2010, the total fertility rate in the United States was estimated to be slightly below the sub-replacement fertility level of 2.1.[7] However, U.S. population growth is among the highest in industrialized countries,[8] since the vast majority of these have below-replacement fertility rates and the U.S. has higher levels of immigration.[9][10] The United States Census Bureau shows population increases ranging between 0.85% and 0.89% for the twelve-month periods ending in 2009.[11] Nonetheless, though high by industrialized country standards, this is below the world average annual rate of 1.19%.[8]

There were 155.6 million females in the United States in 2009. The number of males was 151.4 million. At age 85 and older, there were more than twice as many women as men. People under 20 years of age made up over a quarter of the U.S. population (27.3%), and people age 65 and over made up one-eighth (12.8%) in 2009.[12] The national median age was 36.8 years.[12] Racially, the U.S. has a White American majority. Minorities compose just over one-third of the population (102.5 million in 2007), with Hispanic and Latino Americans and Black Americans as the largest minority groups, by ethnicity and race, respectively.[13]

The American population more than tripled during the 20th century—at a growth rate of about 1.3% a year—from about 76 million in 1900 to 281 million in 2000. It reached the 200 million mark in 1967, and the 300 million mark on October 17, 2006.[14][15] Currently, population growth is fastest among minorities as a whole, and according to the Census Bureau's estimation for 2005, 45% of American children under the age of 5 belonged to minority groups.[16]

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