United States Facts
Capital of United StatesThe capital of United States is Washington, D.C..
| Capital | Washington, D.C. |
| Population (UN estimate, 2024, rounded) | 345.4 million |
| Total area | 9,833,517 km² |
| Population density (calculated) | 35 people per km² |
| Currency | US dollar (USD) |
| Region | North America |
How we got the density
- Density is the one figure on this page that is calculated rather than looked up: population ÷ area.
- 345.4 million people = 345,400,000 people. Divided by 9,833,517 km²: 35.12 people per km², which rounds to 35.
Check it backwards
35 × 9,833,517 km² ≈ 345,156,447 people — back to the population, apart from the rounding of the density to a whole number.
Questions people also ask
What is the capital of United States?
The capital of United States is Washington, D.C..
How many people live in United States?
About 345.4 million, by the UN World Population Prospects 2024 estimate (rounded). Population density works out to 35 people per km².
How big is United States?
United States covers 9,833,517 km² in total area.
What currency does United States use?
The US dollar (USD).