Mexican Embassies and Mexican Consulates Worldwide
The Mexican embassy or consulate near you will be able to provide advice about immigration visas or other official rules, regulations and requirements in Mexico. The are NOT there to promote commercial interests of Mexico, but can put you in touch with other agencies or companies that will be able to help.
This information comes directly from the SRE (Secretaria de Relaciones Exteriores), which is responsible for the Mexican embassies and consulates worldwide. In English, this office is known as the Mexican Ministry of Foreign Affairs.