Notes: When a population pyramid is created, the scale used on the horizontal axis is adjusted to magnify the characteristics of the age-sex distribution for that particular population. This age-sex pyramid places both the total and immigrant populations on the same scale. The age-sex pyramid of the immigrant population takes on a very different shape when it is not adjusted to the total population pyramid's scale.

There were 309.3 million persons in the United States in 2010. Of them, about 40 million or 12.9 percent were immigrants. Total population's male-to-female ratio: 96.7

Source: American Community Survey, 2010.