IATA (International Air Transport Association) code would be MEX.
If you refer as local abbreviations, there is no official one, but most Mexicans know Mexico City as Mexico, "Ciudad de Mexico" or "La Capital".
ANSWER:The standard two letter abbreviation for the state of New Mexico is NM. The abbreveation for Mexico is MX.
NMNM as in New Mexico
The abbreviation for the City of Philadelphia is PHL.
MT is the abbreviation for Montana.
New Mexico
MEX or MX is such abbreviation.
USA
The abbreviation is L.A.
Mexico City.
Mexico City
The abbreviation for Salt Lake City is SLC.
people from Mexico SUCK