C Density of Population
The average density of population is 30 people/km2, but it varies considerably in different parts of the country:
| Region | Density people/km2 | Region | Density people/km2 |
| Industrial North-East | 380 | North & South Dakota Nebraska | 7 |
| The Pacific Coast | more 65 | The Cordilleras (Wyoming to Colorado) | 2-12 |
| The South | more 30 | Alaska | less 1 |
However, one should keep in mind the high mobility of the population. It’s closely connected with the rate and level of development of the country. The average American changes the place of living at least 7times during his/her lifetime.
As far as the rate of the urban and rural population is concerned, the US is a highly urbanized society. The percentage of urban settlers comprises 82% of total and the rate of urbanization is 1.2% (census 2010). As for the rural population, it’s only 17,86%.
States by population
| State | Number (census 2010) | State | Number (census 2010) |
| California | 37,253,956 | Florida | 18,801,310 |
| Texas | 25,145,561 | Illinois | 12,830,632 |
| New York | 19,378,102 | Pennsylvania | 12,702,379 |
States by density of population
| State | Density (mile2\km2) | State | Density (mile2\km2) |
| New Jersey | 1,205\ 465 | Connecticut | 741,4\ 286,3 |
| Rhode Island | 1,016\ 392 | Montana (48th place) | 6,858\ 2,648 |
| Massachusetts | 852,1\ 329 | Alaska (50th place) | 1,264\ 0,488 |
The Largest Cities by population
| City | Number (census 2010) | City | Number (census 2010) |
| New York City | 19,015,900 | Dallas | 6,526,548 |
| Los Angeles | 12,944,801 | Houston | 6,086,538 |
| Chicago | 9,504,753 | Philadelphia | 5,992,414 |
D Age Structure of Population
Average ages are 36.8 years; males are 35.5 years; females are 38.1 years estimated as of 2010.
As of 2010, people are distributed by age as follows:
| Age group | Percentage | Male | Female |
| 0–14 years | 20.2% | 31,639,127 | 30,305,704 |
| 15–64 years | 67% | 102,665,043 | 103,129,321 |
| 65 years - over | 12.8% | 16,901,232 | 22,571,696 |
The average life expectancy of a person born in the US in 2010 is 78.11 years. As in most countries in the world, US women have a higher life expectancy than men - women born in 2010 can expect to live for 80.69 years, while men can only expect to live for 75.65 years.
Compared to the rest of the world, using data compiled by the United Nations between 2005 and 2010, the US is only 37th in the world - sandwiched between Cuba and Portugal.