The current population of California is 39.51 million slightly bigger than Canada's 37.59 million. California started out with a lot fewer people than Canada about 170 years ago. By around 1980, it caught up and its growth rate is still faster so expect it to pull away. alifornia covers 423,970 km², while Canada covers 9,984,670 km², more than 20 times the size. However, an estimated 80% of Canadians live within 160 kilometres of the US border, or an area of 1,424,000 km2.