United States of America is a country in Northern America. In 2025 it has about 347 million people (UN estimate), the 3rd most people of the 193 UN member states.
UN member since 1945Population: 3rd
United States of America米国
Region
Northern America
Population
about 347 million (3rd)
Area
9,833,517 km² (3rd)
UN member since
October 24, 1945
Ranks are among the 193 UN member states, from most people and from largest area.
United States of America in numbers
In 2025 the population is about 347 million, the 3rd most people of the 193 UN member states. That is about 2.8 times Japan’s (about 123 million).
The area is 9,833,517 km², the 3rd largest of the 193. That is about 26 times Japan’s area.
If we work out the number of people per square kilometer (population density), it is about 35.
Joining the United Nations
United States of America joined the United Nations on October 24, 1945.
It was a member before Japan joined in 1956.
26 other countries joined on the same day.
Think about it
Q1Compare United States of America’s population rank and area rank. What do you notice?
Q2Find United States of America on a map or globe. Which countries are around it?
Q3Choose one thing you want to know more about United States of America, and look it up.
There is no single right answer. Talking it over with someone at home is a good way to learn.
Did you know? — There are 2 UN member states in Northern America. The one with the most people is United States of America.