The size of South Asia is 5,221,093 km², while its population is 1,891,454,121 as of 2018.
The size of the United States is 9,833,520 km², while it has a population of 327,167,434 as of 2018.
We can see that the South Asia region is smaller in size than the United States, but still it has much larger population, more than five times larger.
This makes the South Asia region being also much more densely populated than the United States, with South Asia having 362.3 people per square km, while the United States having 32.8 people per square km, with the density being more than eleven times bigger.
