With fewer than a million people, the Comoros is one of the least populous countries in the world, but is also one of the most densely populated, with an average of 275 inhabitants per square kilometre (710 /sq mi). In 2001, 34% of the population was considered urban, but that is expected to grow, since rural population growth is negative, while overall population growth is still relatively high. Major urban centers include Moroni, Mutsamudu, Domoni, Fomboni, and Tsémbéhou.
The islands of the Comoros share mostly African-Arab origins. Sunni Islam is the dominant religion, representing as much as 98% of the population. Although Arab culture is firmly established throughout the archipelago, a minority of the citizens of Mayotte (the Mahorais) are Roman Catholic and have been strongly influenced by French culture. source