Area Code 764 – Puebla

Geographic Overview and Jurisdiction

Area code 764 is a geographic National Destination Code (NDC) assigned to the state of Puebla, Mexico, under the North American Numbering Plan (NANP) framework administered by the Federal Telecommunications Institute (IFT). This code serves a portion of the state, primarily covering the municipalities of Acatlán de Osorio, Petatlán, and surrounding rural communities in the Mixteca Poblana region. The code was introduced as an overlay to the pre-existing 238 code, which historically served the same area, to expand numbering capacity. As a result, both 238 and 764 now coexist within the same geographic area, requiring ten-digit dialing for all local calls.

Dialing Formats and Caller Instructions

For local callers within the 764 area code, calls to another number sharing the same NDC require only the seven-digit local subscriber number. However, due to the overlay, all calls within the region—even between numbers with the same area code—must be dialed using the full ten-digit format (area code + local number) to avoid routing errors. For example, a local call to a subscriber in Acatlán would be dialed as 764 123 4567.

For domestic callers outside the 764 region, the dialing format is: 01 764 123 4567, where '01' is the national long-distance prefix. International callers from outside Mexico must dial the country code, followed by the area code and local number: +52 764 123 4567. The plus sign represents the international access prefix used in the caller's country (e.g., 011 from the United States).

Geographic Coverage and Administrative Details

The 764 code covers a predominantly rural and semi-urban area in the southern part of Puebla state. Key towns include Acatlán de Osorio, Petatlán, and Tulcingo del Valle. The region is known for its agricultural production and artisan crafts. The area is served by both fixed-line PSTN operators and mobile networks, though mobile numbers are not assigned to geographic codes; they use dedicated mobile NDCs such as 222, 238, or others. Therefore, a number with the 764 code is always a fixed-line service, unless porting has occurred, which is rare for geographic numbers.

Regulatory and Technical Considerations

As an overlay code, 764 does not require any change in local dialing habits beyond the mandatory ten-digit dialing. The IFT has mandated that all calls within the overlay area be treated as local, with no additional toll charges. For businesses, it is essential to update stationery, websites, and advertisements to reflect the correct dialing format, especially if they operate in both 238 and 764 areas. Callers should also be aware that while 764 is a geographic code, some VoIP providers may assign numbers with this code to customers outside the region, but this does not affect the dialing procedure.