Facts and figures of Mexico city:
The Mexican Republic is formed by 31 states and the Federal District (fig.1.3). Among the states of this country there is one called the State of Mexico, which is situated in the center of the country surrounding the Federal District. The Federal District (DF) and some counties of the State of Mexico form the Mexico City Metropolitan Area (ZMCM). The Federal District is divided into 16 counties called Delegaciones, all of them constitute the ZMCM. From the total of 121 counties for all of Mexico, only 16 of them are considered part of the ZMCM