Area Code 869 – Cuatro Cienegas/San Buenaventura, COAH

Geographic Coverage and Administrative Jurisdiction

The area code 869 is a geographic National Destination Code (NDC) assigned to the northern Mexican state of Coahuila de Zaragoza. It serves the municipalities of Cuatro Ciénegas and San Buenaventura, located in the central desert region of the state. Cuatro Ciénegas is renowned for its unique biological diversity and the Cuatro Ciénegas Basin, a protected natural area. San Buenaventura, a smaller mining and agricultural community, lies to the northeast. Both towns are part of the broader region that relies on the 869 code for fixed-line and some mobile services.

Dialing Formats and Number Structure

Within Mexico, calls to numbers in the 869 area code require the national long-distance prefix 01, followed by the area code and the seven-digit local number. For example, a local call from Mexico City to a fixed line in Cuatro Ciénegas would be dialed as 01 869 XXX XXXX. When dialing from abroad, the international format is +52 869 XXX XXXX, where +52 is Mexico's country calling code. The total number length after the country code is 10 digits, including the area code.

Caller Instructions

Local callers (within Mexico) must always include the area code, even when calling from a nearby town that shares the 869 code, due to the national numbering plan's closed dialing system. International callers should replace the trunk prefix '01' with the '+' sign and the country code, omitting any leading zero. For example, a caller from the United States would dial 011 52 869 XXX XXXX or +52 869 XXX XXXX from a mobile phone.

Overlay and Numbering Considerations

As of the latest ITU-T E.164 updates, there is no overlay code for the 869 area; it remains a standalone geographic NDC. However, number portability allows subscribers to retain their numbers when switching between fixed-line operators within the same geographic area. Mobile numbers in Mexico are identified by their own NDCs (e.g., 869 is not used for mobile services; mobile numbers typically start with 1, 2, 3, or 4 after the country code). Therefore, 869 is exclusively for fixed-line services, though some VoIP providers may offer virtual numbers with this code for business presence.

Practical Examples

• Local call (within Mexico): 01 869 123 4567
• International call (from abroad): +52 869 123 4567
• International call (from US/Canada): 011 52 869 123 4567

Understanding these dialing protocols ensures seamless connectivity to businesses and residents in the Cuatro Ciénegas and San Buenaventura areas, whether for tourism, commercial activities, or personal communication.