United States

=== Population ===
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{{Main|Americans|Race and ethnicity in the United States}}
{{See also|List of U.S. states by population}}
[[File:Aerial view of Hempstead, July 2019.JPG|thumb|The majority of the U.S. population lives in [[suburb]]s. Above: [[Nassau County, New York]] on [[Long Island]] lies immediately east of [[New York City]].]]

The [[United States Census Bureau|U.S. Census Bureau]] reported 331,449,281 residents as of April 1, 2020,{{efn|This figure, like most official data for the United States as a whole, excludes the five unincorporated territories ([[Puerto Rico]], [[Guam]], the [[U.S. Virgin Islands]], [[American Samoa]], and the [[Northern Mariana Islands]]) and minor island possessions.}}<ref name=2020CENSUS>{{cite web|url=https://www.census.gov/newsroom/press-releases/2021/2020-census-apportionment-results.htmlpid=2020CENSUS&src=pt|title=Census Bureau's 2020 Population Count|work=[[United States Census]]|access-date=April 26, 2021}}</ref> making the United States the [[List of countries and dependencies by population|third-most-populous country]] in the world, after China and India.<ref name="CIA-2018">{{cite web|title=The World Factbook: United States|url=https://www.cia.gov/the-world-factbook/countries/united-states/|access-date=November 10, 2018|publisher=Central Intelligence Agency}}</ref> According to the Bureau's [[U.S. and World Population Clock|U.S. Population Clock]], on January&nbsp;28, 2021, the U.S. population had a net gain of one person every 100 seconds, or about 864 people per day.<ref>{{cite web|title=Population Clock|url=https://www.census.gov/popclock/|website=Census.gov}}</ref> In 2018, 52% of Americans age 15 and over were married, 6% were [[widowed]], 10% were divorced, and 32% had never been married.<ref>{{cite web|title=Table MS-1. Marital Status of the Population 15 Years Old and Over, by Sex, Race and Hispanic Origin: 1950 to Present|url=https://www.census.gov/data/tables/time-series/demo/families/marital.html|access-date=September 11, 2019|website=Historical Marital Status Tables|publisher=U.S. Census Bureau}}</ref> In 2021, the [[total fertility rate]] for the U.S. stood at 1.7 children per woman,<ref>{{Cite web |last=McPhillips |first=Deidre |date=January 31, 2023 |title=Covid-19 'baby bump' brought an increased US fertility rate in 2021 – but also record high preterm births |url=https://www.cnn.com/2023/01/31/health/us-birth-rate-fertility-trends-2021/index.html |access-date=April 16, 2023 |publisher=CNN |language=en}}</ref> and it had the world's highest rate of children (23%) living in [[Single parents in the United States|single-parent]] households in 2019.<ref>{{cite web|title=U.S. has world's highest rate of children living in single-parent households|url=https://www.pewresearch.org/fact-tank/2019/12/12/u-s-children-more-likely-than-children-in-other-countries-to-live-with-just-one-parent/|access-date=March 17, 2020|website=Pew Research Center|language=en}}</ref> As of 2023, the five [[List of U.S. states and territories by population|most populous]] states in the nation are [[California]] (38.9 million), [[Texas]] (30.5 million), [[Florida]] (22.6 million), [[New York (state)|New York]] (19.5 million), and [[Pennsylvania]] (12.9 million).

The United States has a diverse population; 37 [[American ancestries|ancestry groups]] have more than one million members.<ref name="An2000">{{cite web|title=Ancestry 2000|url=https://www.census.gov/prod/2004pubs/c2kbr-35.pdf|date=June 2004|publisher=U.S. Census Bureau|url-status=live|archive-url=http://webarchive.loc.gov/all/20041204015245/https://www.census.gov/prod/2004pubs/c2kbr-35.pdf|archive-date=December 4, 2004|access-date=December 2, 2016}}</ref> [[Non-Hispanic whites|White Americans]] with ancestry from Europe, the Middle East or North Africa, form the largest [[race (human classification)|racial]] and [[ethnic group]] at 57.8% of the United States population.<ref>{{cite web | url=https://www.census.gov/library/stories/2021/08/2020-united-states-population-more-racially-ethnically-diverse-than-2010.html | title=The Chance That Two People Chosen at Random Are of Different Race or Ethnicity Groups Has Increased Since 2010 }}</ref><ref>{{cite web|title=Table 52. Population by Selected Ancestry Group and Region: 2009|url=https://www.census.gov/compendia/statab/2012/tables/12s0052.pdf|year=2009|publisher=U.S. Census Bureau|archive-url=https://web.archive.org/web/20121225031832/https://www.census.gov/compendia/statab/2012/tables/12s0052.pdf|archive-date=December 25, 2012|access-date=February 11, 2017}}</ref> [[Hispanic and Latino Americans]] form the second-largest group and are 18.7% of the United States population. African Americans constitute the country's third-largest ancestry group and are 12.1% of the total U.S. population.<ref name="An2000" /> Asian Americans are the country's fourth-largest group, composing 5.9% of the United States population. The country's 3.7 million Native Americans account for about 1%,<ref name="An2000" /> and some 574 native tribes are  recognized by the federal government.<ref>{{Cite web |title=Federally recognized American Indian tribes and Alaska Native entities {{!}} USAGov |url=https://www.usa.gov/indian-tribes-alaska-native |access-date=2024-04-05 |website=www.usa.gov |language=en}}</ref> In 2020, the [[median age]] of the United States population was 38.5 years.<ref name="CIA-2018" />