The population of Brittany is about 4.7 million (7% of the French population), a little less than Louisiana’s or the Republic of Ireland’s, for instance, and most of France’s regions. Half of the states in the US have a smaller population than Brittany.
The population density is 138 people / sq. km (118 in mainland France). The major metropolitan areas are Nantes with about 1 m. people, Rennes with 730,000 and Brest with 320,000.
The population of Brittany is growing, mainly because of its attractiveness, both as a dynamic region with high living standards, and as a great place to retire.