Area Code 58 – Estado de Mexico

Overview of Area Code 58 (Mexico)

Area code 58 is a geographic National Destination Code (NDC) assigned to the Estado de México (State of Mexico), one of the 32 federal entities of Mexico. This code serves a significant portion of the state's urban and suburban areas, which are part of the greater Mexico City metropolitan area. The region is densely populated and includes numerous municipalities that are economically integrated with the capital.

Geographic Coverage and Administrative Jurisdiction

The 58 area code covers a substantial part of the Estado de México, particularly the eastern and northeastern zones bordering Mexico City. Key municipalities served include Ecatepec de Morelos, Nezahualcóyotl (Ciudad Nezahualcóyotl), La Paz, Chimalhuacán, and Los Reyes Acaquilpan, among others. These areas are characterized by a mix of residential, commercial, and industrial zones. The administrative jurisdiction falls under the state government of Mexico, with local telecommunications regulated by the Instituto Federal de Telecomunicaciones (IFT).

Dialing Formats and Caller Instructions

For local callers within the 58 area code, it is essential to dial the 10-digit national number, which includes the area code followed by the 8-digit local subscriber number. For example, to call a landline in Ecatepec, you would dial 58 XXX XXXX (where X represents the local digits). This format applies to both local and long-distance calls within Mexico, as the country adopted a unified dialing plan in August 2019, eliminating the need to dial '01' for national long-distance calls.

For international callers, the format is: +52 58 XXX XXXX. The plus sign indicates the international access code, followed by Mexico's country code (52), the area code (58), and the local number. For example, a caller from the United States would dial 011 52 58 XXX XXXX (or use the '+' key on mobile devices).

Overlay Considerations and Numbering Resources

Currently, there is no overlay area code for the 58 region; the code is exclusive to this geographic area. However, due to the high demand for numbers in the Mexico City metropolitan area, the IFT has implemented number pooling and other conservation measures. In the future, an overlay may be introduced, which would require 10-digit dialing for all calls, even local ones, but this is not yet in effect.

Technical and Regulatory Notes

Area code 58 is used for fixed-line services (PSTN) and is also assigned to some VoIP providers that offer geographic numbers. All numbers under this code are considered geographic, meaning that the tariff for calls to these numbers is based on the destination's location. Mobile numbers in Mexico are identified by their own non-geographic prefixes (e.g., 55, 56, etc.) and are not part of the 58 area code. When calling a number in the 58 area code from a mobile phone, the same 10-digit dialing rules apply.

For businesses and residents, it is important to note that number portability is available in Mexico, allowing users to retain their numbers when switching service providers, but the geographic area code remains tied to the original location.