I've always been familiar with the sizes and populations but I did some math on the estimates...
Land Mass: 3,794,083 miles
People Per Square Mile: 80
Land Mass: 3,705,407 miles²
People Per Square Mile: 359
Land Mass: 94,526 miles²
People Per Square Mile: 645
WOW, I mean these numbers are just ASTOUNDING to me. Especially China's population, that is OVER 1 BILLION MORE people than in the US! I knew they "had over a billion people", but not a billion MORE. How have we earned as many medals as they have with us having 1/4 of their population. Brits, major kudos, wow.
I've been to most of the major cities in the US, and all over the world but never felt like it was too crowded... But you look at the PPSM of just these three, man what a difference.
Aussies and Canadians have got some major elbow room too!