CBSAs are subdivided into MSAs (formed around urban areas of at least 50,000 in population) and ...
The Core Based Statistical Areas currently defined by the OMB include the 374 Metropolitan Statistical Areas (MSAs), which have an urban core population of at least 50,000, and the 581 Micropolitan Statistical Areas (μSAs), which have an urban core population of at least 10,000 but less than 50,000.
metro_areas_population - datamexico/data-etl Wiki Descripción General y Ejecución El presente pipeline procesa los datos facilitados por el Consejo Nacional de Población (CONAPO) que toman relación con la población total a nivel de Zona Metropolitana.
Population (2015) 1 Mexico City: Mexico: 20,892,724 2 New York City: United States: 20,182,305 3 Los Angeles: United States: 13,340,068 4 Chicago: United States: 9,551,031 5 Dallas–Fort Worth: United States: 7,102,796 6 Houston: United States: 6,656,947 7 Toronto: Canada: 6,116,725 8 Washington, D.C. United States: 6,097,684 9 Philadelphia: United States: 6,069,875 10 Miami
Metropolitan areas are known as zonas metropolitanas in Mexico. The National Population Council (CONAPO) defines them as: a set of two or more municipalities where a city with a population of at least 100,000 is located, and whose urban area, functions and activities exceed the limits of the municipality.
As per this last definition, there are currently 74 metropolitan areas in Mexico. 75.1 million people, 62.8% of the country population, live within a metropolitan area.  Northern states are generally divided into a small number of large municipalities, whereas central and southern states are divided into a large number of smaller municipalities.