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The median age of the total population as of 2021 is 38.8 years; the male median age is 37.7 years; the female median age is 39.8 years. [55] Median age of the U.S. population through history. Source: U.S. Department of Commerce. Bureau of Census, United States Census Bureau and The World Factbook. [65] [66]
The 2020 United States census was the 24th decennial United States census.Census Day, the reference day used for the census, was April 1, 2020.Other than a pilot study during the 2000 census, [1] this was the first U.S. census to offer options to respond online or by phone, in addition to the paper response form used for previous censuses.
The states and territories included in the United States Census Bureau's statistics for the United States population, ethnicity, and most other categories include the 50 states and Washington, D.C. Separate statistics are maintained for the five permanently inhabited territories of the United States: Puerto Rico, Guam, the U.S. Virgin Islands ...
Sex ratio by country for the population below age 15. Blue represents more boys, red more girls than the world average of 1.07 males/female. Sex ratio by country for total population. Blue represents more men and boys, red more women and girls than the world average of 1.01 males/female. Sex ratio by country for the over-65 population.
The value for the entire world population is 1.02 males/female, [5] with 1.07 at birth, 1.06 for those under 15, 1.02 for those between 15 and 64, and 0.78 for those over 65. The Northern Mariana Islands have the highest female ratio with 0.77 males per female. Qatar has the highest male ratio, with 2.87
Between 1880 and 1900, the urban population of the United States rose from 28% to 40%, and reached 50% by 1920, in part due to 9,000,000 European immigrants. After 1890 the US rural population began to plummet, as farmers were displaced by mechanization and forced to migrate to urban factory jobs.
The total population is 6,981,974, making it the 16th most populous state as of 2023 estimates. [5] Massachusetts has a density of 895 people per square mile, [6] making it the third most dense of the fifty states (fifth including District of Columbia and Puerto Rico).
This can cause a discrepancy in the sex ratios as well. In the bluestreak cleaner wrasse, there is only one male for every group of 6-8 females. If the male fish dies, the strongest female changes its sex to become the male for the group. All of these wrasses are born female, and only become male in this situation.