Greater Mexico City is formed by Mexico City, 60 municipalities from the State of Mexico and one from the state of Hidalgo. Greater Mexico City is the largest metropolitan area in Mexico and the area with the highest population density. , 21,804,515 people live in this urban agglomeration, of which 9,209,944 live in Mexico City proper. In terms of population, the biggest municipalities that are part of Greater Mexico City (excluding Mexico City proper) are in the State of Mexico: