where does mexico city rank among the world's largest cities
Mexico City The 2009 estimated population for the city proper was approximately 8.84 million people,[16] with a land area of 1,485 square kilometres (573 sq mi).[17] According to the most recent definition agreed upon by the federal and state governments, the Greater Mexico City population is 21.3 million people, making it the largest metropolitan area of the Western Hemisphere, the tenth-largest agglomeration, and the largest Spanish-speaking city in the world.[18]