Area Code 636 – Chihuahua
The phone area code for Chihuahua is 636 (international format +52636). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 636
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Chihuahua
Geographic Coverage and Administrative Jurisdiction
Area code 636 is a geographic National Destination Code (NDC) assigned to the state of Chihuahua, Mexico, under the country calling code +52. This prefix covers the western and central portions of the state, including the municipalities of Guachochi, Balleza, Nonoava, and San Francisco de Borja, among others. The region is characterized by the Sierra Tarahumara mountain range and is administratively part of the state of Chihuahua. The principal city served by this code is Guachochi, a key commercial and cultural hub for the indigenous Rarámuri communities. Other localities include Cusárare, Norogachi, and Creel, the latter being a gateway to the Copper Canyon tourist destination.
Dialing Formats and Caller Instructions
For domestic callers within Mexico, the number is dialed as 01 636 XXX XX XX, where the leading '01' is the national long-distance prefix. For international callers, the format is +52 636 XXX XX XX. Note that the national trunk prefix '01' is not part of the international dialing sequence. When dialing from a mobile phone within Mexico, the same '01' prefix is used for landline numbers, but if calling a mobile number in the same area code, the caller may dial the 10-digit number directly (636 XXX XX XX) depending on the mobile operator's current dialing plan. It is always recommended to use the full national format to ensure proper routing.
Overlay and Numbering Considerations
As of the latest ITU-T E.164 national numbering plan updates, area code 636 does not have an overlay code; it is the sole geographic code for its service area. However, the Mexican Federal Telecommunications Institute (IFT) has implemented number portability across the country, allowing subscribers to retain their numbers when changing service providers, even across different technology types (PSTN, VoIP, or mobile). This means that a number with the 636 prefix may be assigned to a VoIP or mobile user, but the geographic association remains for administrative and routing purposes.
Practical Examples
- Local call within Guachochi: 636 XXX XX XX
- Domestic long-distance from Mexico City: 01 636 XXX XX XX
- International call from the United States: +52 636 XXX XX XX
When placing a call to this region, always verify the current dialing procedures with your telecom provider, as routing may change due to regulatory updates or network migrations.