Area Code 745 – Guerrero

Geographic Coverage and Administrative Jurisdiction

The area code 745 is a geographic National Destination Code (NDC) assigned to the state of Guerrero, Mexico, under the country calling code +52. This code serves a predominantly rural and semi-urban region within the Sierra Madre del Sur, covering municipalities such as Ajuchitlán del Progreso, San Miguel Totolapan, General Heliodoro Castillo (Tlacotepec), and surrounding localities. The administrative jurisdiction falls under the Secretariat of Infrastructure, Communications and Transportation (SICT) and the Federal Telecommunications Institute (IFT), which manage numbering resources in accordance with the National Numbering Plan.

Primary Cities and Local Dialing

The principal population centers within this code include Ciudad Altamirano (though partially served by other codes, 745 covers surrounding areas), Tlacotepec, and Ajuchitlán. These towns function as local commercial and administrative hubs for the region. For local calls within the same area code, subscribers typically dial only the 7-digit local number (without the area code). However, due to the implementation of the Marcación a 10 dígitos (10-digit dialing) nationwide in Mexico since August 2019, all calls—including local ones—must be dialed using the 10-digit format: 745 + local number. This change eliminated the need to dial the long-distance prefix '01' for national calls.

International Format and Caller Instructions

For callers from outside Mexico, the international dialing format is: +52 745 XXX XXXX (where X represents the 7-digit local subscriber number). For example, a landline in Tlacotepec might be reached at +52 745 123 4567. International callers should replace the '+' with their country's international access code (e.g., '011' from the US/Canada). For domestic callers from other area codes within Mexico, dial 745 XXX XXXX (10 digits total). No '01' prefix is required.

Overlay and Numbering Considerations

As of the latest IFT updates, there is no overlay code for 745; the area code serves its geographic region exclusively. However, due to the 2019 numbering reform, all numbers in Mexico are now 10 digits, and the distinction between local and long-distance dialing has been simplified. Mobile numbers in Mexico always begin with the digit '1' after the area code (e.g., +52 1 745 ...), but this prefix is not used for landlines. For landlines under 745, the number length is 7 digits after the area code, totaling 10 digits when including the NDC.

Practical Guidance for Callers

• Local callers within the 745 region: dial the 7-digit number directly (or 745 + 7-digit if your phone requires 10-digit dialing).
• National callers from other Mexican area codes: dial 745 XXX XXXX.
• International callers: dial your exit code + 52 + 745 + 7-digit number. Example: from the US, dial 011 52 745 123 4567.

This area code is part of Mexico's geographic numbering plan, ensuring that calls are routed efficiently to the correct region. For businesses or individuals planning to establish a presence in Guerrero's inland communities, obtaining a 745 number can enhance local credibility and accessibility.