Brazil vs United States: population
How Brazil and United States compare in population today and out to 2100, side by side, from UN World Population Prospects 2024.
Brazil and United States population, 2000-2100
Population 2000-2100
Side by side
| 🇧🇷 Brazil | 🇺🇸 United States | |
|---|---|---|
| Population today | 213 million | 348 million |
| Population 2050 | 218 million | 380 million |
| Population 2100 | 164 million | 421 million |
| World rank | #7 | #3 |
| Peak year | 2042 | after 2100 |
| Median age (2024) | 34 | 38 |
| Fertility rate (2024) | 1.61 | 1.62 |
| Life expectancy (2024) | 76 yrs | 79 yrs |
| Density (per km²) | 26 | 38 |
Why this comparison matters
The two largest countries in the Americas are moving apart. The United States, with 1.6 births per woman and sustained net immigration, is projected to keep growing to 421 million by 2100. Brazil's fertility has fallen further, to 1.6, and the UN projects its population to peak around 2042 and then fall to 164 million. There is no crossover: the gap grows from about 133 million in 2024 to 257 million by 2100.
Brazil vs United States, explained
Today United States is the larger of the two, with about 348 million people against Brazil's 213 million. Brazil is the world's 7th most populous country and United States the 3rd.
Their paths to 2100 differ. Brazil falls sharply over the century, moving from about 212 million to 164 million (-22.5%). United States keeps growing, going from 344 million to 421 million (+22.2%).
The order does not flip this century: United States is still the larger of the two in 2100. The two trajectories run in parallel rather than crossing.
The deeper contrast is age and fertility. Brazil has a median age near 34 and 1.61 births per woman, against United States's 38 and 1.62. All figures follow the UN's medium-variant projection.