Area Code 1 – Buenos Aires
The phone area code for Buenos Aires is 1 (international format +541). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 1
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Buenos Aires
Overview of Argentina's Area Code 1
In the Argentine national numbering plan, the country calling code +54 is followed by a two-digit National Destination Code (NDC) for geographic areas. The NDC 1 is assigned to the Autonomous City of Buenos Aires (CABA) and its surrounding metropolitan region, commonly known as Greater Buenos Aires (Gran Buenos Aires). This area is the political, financial, and cultural heart of Argentina, hosting the national government and the headquarters of most major corporations. The geographic coverage includes the 15 communes of CABA and the adjacent partidos of the Province of Buenos Aires, such as Avellaneda, San Isidro, Vicente López, and Lanús, among others.
Dialing Formats
For local calls within the Buenos Aires area, subscribers dial the eight-digit subscriber number directly, without any prefix. For example, to call a landline in Buenos Aires from another landline in the same area, you would dial 1234-5678.
For calls from other regions within Argentina (excluding Buenos Aires), you must dial the national trunk prefix 0, followed by the NDC 11 (which is the full NDC for Buenos Aires), and then the eight-digit subscriber number. For instance, to call Buenos Aires from Córdoba, you would dial 011 1234-5678.
For international callers, the format is +54 11 1234-5678 (or 0054 11 1234-5678 when using the international access prefix from many countries). The leading '0' is omitted when dialing from abroad.
Numbering and Overlay
Subscriber numbers in Buenos Aires are eight digits long. Historically, the NDC was '1' and subscriber numbers were seven digits, but in 1999, a numbering change added a '1' to the beginning of all subscriber numbers, effectively creating the current NDC '11' for national dialing. This change was necessary to accommodate the growing demand for telephone lines in the metropolitan area. Today, the NDC '11' is used for all landlines in the region, and there is no overlay code; the area is served by a single NDC.
Caller Instructions
Local callers within Buenos Aires can dial the eight-digit number directly. National callers from other provinces must include the trunk prefix '0' and the NDC '11'. International callers must use the country code +54 and the NDC '11', omitting the trunk prefix. It is important to note that mobile numbers in Argentina also begin with '11' but are part of a separate mobile numbering plan and are not included in this geographic area code. When dialing a mobile number from abroad, you would use +54 9 11 followed by the eight-digit mobile number, but this is distinct from the geographic landline code.