Kilometers are a measure of distance, not population. So you cannot convert population numbers into kilometers.
The vast majority of Canada's population is located within 200 kilometers of the border with the US.
The US is more than 25 times larger than Japan. The area of the US is almost 10,000,000 square kilometers, while the area of Japan is less than 400,000 square kilometers. The US is 26.2 times the area of Japan, and has about 2.5 times the population.
There are far more people in the US than in Canada. Canada's population is approximately one-tenth that of the US. Much of Canada's population lives within 200 kilometers of the US border. The greatest population density occurs in the Windsor to Québec City corridor.
The United States is about 2,000,000 kilometers larger than Australia, and has about 15x the population.
524 million. You just said.
Latin America is geographically much larger than the United States. It covers 19.7 million square kilometers, while the US is around 9.8 million square kilometers. However, the US has a larger population than Latin America as a whole.
9,826,675 square kilometers
what is the distance between the us and Australia.
Tables listing distances in kilometers are usually not used in the US because the US measures distances in miles, not in kilometers.
7,629 Kilometers
The USA is bigger. The total area of Australia is 7,741,220 square kilometers, and the total area of the US is 9,629,630 square kilometers. In population size the USA (population 301,000,000) is much larger than Australia (population 21,000,000). Australia is nearly as big as Contiguous United States (48 mainland states). Contiguous United States is 7,663,941.71 km² while Australia is 7,617,930km². So about 44,000km² in difference.
1 US mile is approximately equal to 1.609 kilometers.