Area Code 2257 – Mar de Ajó, Buenos Aires
The phone area code for Mar de Ajó, Buenos Aires is 2257 (international format +542257). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2257
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Mar de Ajó, Buenos Aires
Geographic Overview
The area code 2257 is a geographic National Destination Code (NDC) assigned to the city of Mar de Ajó and its surrounding localities within the Buenos Aires Province of Argentina. This coastal region, part of the Partido de La Costa, is a significant tourist destination along the Atlantic coast. The code serves the urban center of Mar de Ajó and nearby towns such as San Bernardo and Costa Azul, which share the same local telephony infrastructure.
Dialing Formats
For domestic callers within Argentina, the number must be dialed in the national format: 02257 followed by the local subscriber number. The leading 0 is the national trunk prefix, and 2257 is the area code. The local subscriber numbers in this region typically consist of 6 digits, resulting in a total of 10 digits when dialed nationally (0 + area code + subscriber number).
For international callers, the Argentine country code +54 is used, and the leading 0 of the national prefix is omitted. Thus, the international dialing format is +54 2257 followed by the 6-digit local number. For example, if the local number is 456789, a domestic caller would dial 02257 456789, while an international caller would dial +54 2257 456789.
Caller Instructions
When calling from a landline or mobile phone within Argentina, you must always include the trunk prefix 0 and the area code 2257 before the local number, even if you are calling from a nearby city with the same area code. This is mandatory under the Argentine national numbering plan. For callers from abroad, ensure you use the international access code of your country (e.g., 00 or +) followed by 54 and the area code without the leading zero.
Overlay and Numbering Considerations
As of the latest ITU-T E.164 guidelines, there are no overlay codes in this region, meaning that 2257 is the sole area code for Mar de Ajó and its environs. However, due to the expansion of mobile and VoIP services, some numbers may be ported from fixed lines to mobile networks, but the area code remains unchanged for geographic routing purposes. For emergency services or directory assistance, always dial the national emergency numbers (e.g., 911) rather than using the area code.