El Barrio Centro belongs to the delegation of Milpa Alta, Ciudad de México (CDMX) and its official ZIP Code is 12400
The Postal Codes National Catalog is prepared by the Mexican Postal Service and the postal code has 5 digits, depending on the country area. The first two digits identify the state or part of it. In the case of Mexico City DF, the first two digits represent the administrative division (Delegation). In the case of Milpa Alta the Zip Code range of the Ciudad de México state is 01 a 16. To send letters or packages to Milpa Alta, Ciudad de México you must always use the five-digit postal code.
The local area phone code is 55
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Check out the list of cities with 12400 ZIP Code in México