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.
Islam in France
According to , a researcher at INED, an acceptance of 5 to 6 million Muslims in France in 1999 was overestimated. Her work has shown that there were 3.7 million people of "possible Muslim faith" in France in 1999 (6.3% of the total population of Metropolitan France). These 3.7 million people whose ancestry is from countries where Islam is the dominant faith may or may not be observant Muslims themselves. In 2009, she estimated that the number of people of "possible Muslim faith" in France was about 4.5 million.