City At Night

• Mexico
The Mexican population is increasingly urban with close to 75% of the population living in cities. The five largest metropolitan areas of Mexico (Greater Mexico City, Greater Guadalajara, Greater Monterrey, Greater Puebla and Greater Tijuana) are home to 30% of the country's population.
In 2004, a joint effort between CONAPO (National Council of Population), INEGI and the Secretariat of Social Development (SEDESOL) agreed to define metropolitan areas as either:
- The group of two or more municipalities in which a city with a population of at least 50,000 is located whose urban area extends over the limit of the municipality that originally contained the core city incorporating either physically or under its area of direct influence other adjacent predominantly urban municipalities all of which have a high degree of social and economic integration or are relevant for urban politics and administration.