Republic of Korea vs United States of America: population pyramids in 2021
Republic of KoreaUnited States of America
Each bar is the share of the total population at that single year of age (men left, women right), so countries of different sizes can be compared.
Republic of Korea and United States of America compared
In 2021, the Republic of Korea has a population of 51.9 million and the United States of America 339.7 million; the United States of America is about 6.5 times the size of the Republic of Korea.
The share aged 65 and over is 16.2% in the Republic of Korea and 16.3% in the United States of America, almost the same. The median age is 44.0 years in the Republic of Korea and 38.3 years in the United States of America.
The total fertility rate is 0.78 in the Republic of Korea and 1.63 in the United States of America, both below the replacement level of about 2.1. Life expectancy at birth is 83.8 years in the Republic of Korea and 76.4 years in the United States of America.
By 2050, the population of the Republic of Korea is projected to shrink by 12.7% and that of the United States of America to grow by 11.9% compared with 2021.
GDP per person is $36K in the Republic of Korea (2025) and $90K in the United States of America (2025).
Key figures (2021)
| Republic of Korea | United States of America | |
|---|---|---|
| Population | 51.9 million | 339.7 million |
| Aged 0–14 | 12.0% | 18.3% |
| Aged 15–64 | 71.8% | 65.5% |
| Aged 65+ | 16.2% | 16.3% |
| Median age | 44.0 yrs | 38.3 yrs |
| Old-age dependency | 22.6 | 24.8 |
| Total fertility rate | 0.78 | 1.63 |
| Life expectancy | 83.8 yrs | 76.4 yrs |
| Population growth | -0.16% | +0.25% |
| Net migration (per year) | -16,778 | +674,787 |
| GDP | $1.87T (2025) | $30.8T (2025) |
| GDP per person | $36K (2025) | $90K (2025) |
| Unemployment | 2.7% (2025) | 4.2% (2025) |
Economic figures are the latest year published for each country.