★美国人口2012当前和历史数量
☆CIA数据
313,847,465 (July 2011 est.) 3.1亿（美国）东部标准时间2011.7
country comparison to the world: 3 世界排名3
via 同上 CIA官网
☆wikipedia’s data
As of 2012, the United States has a total resident population of 313,986,000,[1] making it the third most populous country in the world.[2] It is a very urbanized population, with 82% residing in cities and suburbs as of 2008 (the worldwide urban rate is 50.5%[3]). This leaves vast expanses of the country nearly uninhabited.[4] California and Texas are the most populous states,[5] as the mean center of United States population has consistently shifted westward and southward.[6] New York City is the most populous city in the United States.
到2012，美国总居住人口有3.1398亿，这使它成为世界第三大人口国。它是个非常城市化的人口，截至2008有82%居住在城市和近郊（世界范围内城市化率为50.5%）。这使得这个国家广阔的区域是无人居住。加利福利亚和德克萨斯是人口最多的洲，这意味着美国的人口中心持续地向西和向南转移。纽约城是全美人口最多的城市。
Core city市中心区:New York
City Metro area pop.19,015,900
based on the 2011 U.S. Population Estimate
via Wikipedia:Demographics of the United States 链接
☆Historical populations历史人口
人口普查 人口 变化率
Census Pop. %±
1790 3,929,214 –
1800 5,236,631 33.3%
1810 7,239,881 38.3%
1820 9,638,453 33.1%
1830 12,866,020 33.5%
1840 17,069,453 32.7%
1850 23,191,876 35.9%
1860 31,443,321 35.6%
1870 38,558,371 22.6%
1880 49,371,340 28.0%
1890 62,979,766 27.6%
1900 76,212,168 21.0%
1910 92,228,496 21.0%
1920 106,021,537 15.0%
1930 123,202,624 16.2%
1940 132,164,569 7.3%
1950 151,325,798 14.5%
1960 179,323,175 18.5%
1970 203,211,926 13.3%
1980 226,545,805 11.5%
1990 248,709,873 9.8%
2000 281,421,906 13.2%
2010 308,745,538 9.7%
★美国人口出生率与增长率
The total fertility rate in the United States estimated for 2009 is 2.01 children per woman, which is below the replacement fertility rate of approximately 2.1.[10] However, U.S. population growth is among the highest in industrialized countries,[11] since the vast majority of these have below-replacement fertility rates and the U.S. has higher levels of immigration. The United States Census Bureau shows population increase of 0.91% for the twelve month period ending in July 2011.[14] Nonetheless, though high by industrialized country standards, this is below the world average annual rate of 1.092%.
美国2009年总的人口出生率估计为每个女性生产2.01个小孩，那是低于约2.1的置换生育率（人口置换率/人口替换率replacement fertility rate ）。然而，美国人口增长在工业化国家中是最高的，因为这些国家绝大多数低于置换出生率，而美国有高水平的移民。美国移民局展示在截止2011.7的12个月的时期里，人口增长0.91%。尽管如此，虽然比工业化国家标准高，但这是低于世界平均年度增长率1.092%.
★美国中国中美婴儿死亡率对比
☆美国
Infant mortality rate婴儿死亡率
total: 5.98 deaths死亡/1,000 live births安全出生
country comparison to the world世界排名: 174
male: 6.64 deaths/1,000 live births
female: 5.3 deaths/1,000 live births (2011 est.)
☆中国
Infant mortality rate:
total: 15.62 deaths/1,000 live births
country comparison to the world: 111
male: 15.38 deaths/1,000 live births
female: 15.9 deaths/1,000 live births (2011 est.)
★中美人口平均预期寿命对比
☆美国
Life expectancy at birth平均预期寿命:
total population: 78.49 years
country comparison to the world: 50
male: 76.05 years
female女性: 81.05 years (2011 est.)
☆中国
Life expectancy at birth:
total population: 74.84 years
country comparison to the world: 96
male: 72.82 years
female: 77.11 years (2011 est.)
★美国人结婚年龄
Marriage婚姻
In 2010, the median age for marriage for men was 27; for women, 26.
在2010，美国男人结婚年龄中位数为27，女人26.（via wikipedia）
★美国中情局轶闻
今年2月，美国中情局发布了一份更新，“赶上”了由用户生成内容的维基百科，有几处干脆就照搬维基百科引用的原始资料。
In February it issued an update that caught up to the user-generated encyclopedia, in some cases lifting its numbers from the same sources Wikipedia used.
www.fortunechina.com
★参考资料
- wikipedia.org
- cia.gov