MEXICO CITY also known as México D.F.,or simply D.F..It's capital of Mexico and seat of the federal powers of the Mexican Union. Mexico City is one of the most important financial centers in North America. In 2009 they calculate a 8.84 million people and has a land area of 1,485 square kilometres. Mexico City is the eight richest city in the world. Mexico city was found March 13, 1325 of Aztecs.