| Capital | Washington, D.C. 38°53′N 77°01′W | |
| Largest city | New York City 40°43′N 74°00′W | |
|---|---|---|
| Official languages | None at federal level[a] | |
| National language | English[b] | |
| Demonym | American | |
| Government | Federal presidentialconstitutional republic | |
| - | President | Barack Obama (D) |
| - | Vice President | Joe Biden (D) |
| - | Speaker of the House | John Boehner (R) |
| - | Chief Justice | John Roberts |
| Legislature | Congress | |
| - | Upper house | Senate |
| - | Lower house | House of Representatives |
| Independence from Great Britain | ||
| - | Declared | July 4, 1776 |
| - | Recognized | September 3, 1783 |
| - | Constitution | June 21, 1788 |
| Area | ||
| - | Total | 9,826,675 km2[4][c](3rd/4th) 3,794,101 sq mi |
| - | Water (%) | 6.76 |
| Population | ||
| - | 2013 estimate | 317,803,000[5] (3rd) |
| - | Density | 34.2/km2 (180th) 88.6/sq mi |
| GDP (PPP) | 2014 estimate | |
| - | Total | $17.438 trillion[6] (1st) |
| - | Per capita | $54,609[6] (7th) |
| GDP (nominal) | 2014 estimate | |
| - | Total | $17.438 trillion[6] (1st) |
| - | Per capita | $54,609[6] (8th) |
| Gini (2011) | 47.7[7] high · 39th (2009) | |
| HDI (2013) |  0.937[8]very high · 3rd | |
| Currency | United States dollar($) (USD) | |
| Time zone | (UTC−5 to −10) | |
| - | Summer (DST) | (UTC−4 to −10[e]) |
| Drives on the | right[g] | |
| Calling code | +1 | |
| ISO 3166 code | US | |
| Internet TLD | .us .gov .mil .edu | |
| a. | ^ English is the official language of at least 28 states; some sources give higher figures, based on differing definitions of "official".[9] English and Hawaiian are both official languages in the state of Hawaii. | |
| b. | ^ English is the de facto language of American government and the sole language spoken at home by 80 percent of Americans aged five and older. Spanish is the second most commonly spoken language. | |
| c. | ^ Whether the United States or China is larger has beendisputed. The figure given is from the U.S. Central Intelligence Agency's The World Factbook. Other sources give smaller figures. All authoritative calculations of the country's size include only the 50 states and the District of Columbia, not the territories. | |
| d. | ^ The population estimate is of people whose usual residence is within the 50 states and the District of Columbia, regardless of nationality. It does not include those living in the territories (over 4 million people, mostly in Puerto Rico). | |
| e. | ^ See Time in the United States for details about laws governing time zones in the United States. | |
| f. | ^ Does not include insular areas and United States Minor Outlying Islands, which have their own ISO 3166 codes. | |
| g. | ^ Except U.S. Virgin Islands. | |
