Area Code 97 – Oaxaca

Geographic Coverage and Jurisdiction

The Mexican area code 97 is a geographic National Destination Code (NDC) assigned to the state of Oaxaca, located in the southern region of the country. This code serves the central valleys and surrounding municipalities, with the primary urban center being the city of Oaxaca de Juárez, the state capital. The numbering area encompasses both the metropolitan zone and various suburban and rural localities within the administrative jurisdiction of the state. As part of Mexico's open numbering plan, the prefix is used for fixed-line PSTN services, though some numbers may be assigned to VoIP providers offering geographic numbers.

Dialing Formats and Procedures

For domestic calls within Mexico, the national dialing format requires the long-distance prefix 01, followed by the area code 97 and the local subscriber number (typically 7 digits). For example, to call a fixed line in Oaxaca City from elsewhere in Mexico, you would dial: 01 97 XXX XXXX. For international callers, the format is the Mexican country code +52, followed by the area code 97 and the subscriber number, omitting the domestic trunk prefix: +52 97 XXX XXXX. When dialing locally within the same area code, the 01 and area code are often omitted, and only the 7-digit local number is used, depending on the specific carrier and local dialing regulations.

Administrative and Regulatory Context

The allocation and management of the 97 area code fall under the jurisdiction of the Instituto Federal de Telecomunicaciones (IFT), Mexico's telecommunications regulatory body. The code is part of the national numbering plan that adheres to ITU-T E.164 recommendations. While the state of Oaxaca is served by multiple area codes (such as 951 for the capital and 953 for the Istmo region), the 97 code is specifically designated for the central region, ensuring efficient routing of calls within the PSTN. As of recent years, no overlay codes have been implemented for this area, meaning the 97 code remains the sole geographic identifier for its service region. However, number portability allows subscribers to retain their numbers when switching between fixed-line carriers, which may affect the association of a specific number with a physical location.

Guidance for Callers

For local callers within the 97 area, dialing a number in the same code typically requires only the 7-digit subscriber number, but it is advisable to confirm with your service provider. For callers from other parts of Mexico, always include the national long-distance prefix 01 before the area code. International callers must use the +52 country code and drop the leading zero that is used in domestic dialing. It is important to note that charges for calls to this geographic area vary depending on the caller's location and the carrier's tariff structure; calls from mobile phones may incur additional long-distance charges if the caller is outside the local area. Always verify the complete number with the recipient to avoid misdialing, as the area code is essential for correct routing.