Do you live in one of the happiest cities in Canada? Mississauga, Ont., appears to be home to the happiest Canadians, as the city boasts the highest happiness index in the country at 70.3. Toronto is the 10th happiest city in Canada, with a happiness index of 65.8. — 65.8Although Ontario is home to some of the happiest cities in Canada, when compared to other provinces, Ontario is only in the eighth spot. The bad news is that those levels remain stagnant — 49 per cent said their happiness levels stayed the same.