Metropolitan France
According to INSEE, 65,018,000 people lived in metropolitan France as of January 2018, while 2,790,000 lived in overseas France, for a total of 67,808,000 inhabitants in the French Republic. Thus, metropolitan France accounts for 95.9% of the French Republic's population.
France in the twentieth century
Unlike other European countries France did not experience a strong population growth in the mid and late 19th century and first half of the 20th century. This would be compounded by the massive French losses of World War I — roughly estimated at 1.4 million French dead including civilians (or nearly 10% of the active adult male population) and four times as many wounded — and World War II — estimated at 593,000 French dead (one and a half times the number of American dead), of which 470,000 were civilians. From a population of around 39 million in 1880, France still had only a population of 40 million in 1945. The post-war years would bring a massive "baby boom", and with immigration, France reached 50 million in 1968. This growth slowed down in 1974.