U.S.- 313 million
Canada- 35 million

The U.S. is over nine times more populous. Equating population, it would have about 220 billionaires.

Canada is a growing country, give us time and it won't be long before proportonally we have more billionaires.
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Original intent of thread; in Calgary the flow favours Canada; Calgary is a center of laser and cosmetic surgery and these clinics have a goodly number of Americans seeking these services and paying for them. In the long run, it probably means lower costs to Canadians using the Alberta Health Plan*

*There is no overall Canadian plan except for some of the monetary input from tax money. I think Alberta contributes more than it receives, but I'll let someone else hunt out those figures.