Argentina uses a variable-length national numbering plan in which a geographic telephone number consists of an area code plus a subscriber number that together total ten digits. The system accommodates urban and provincial differences by varying the length of the area code while keeping the full national number consistent in length. This article explains how the parts fit together, how numbers are commonly written, and the main dialing procedures for calls within Argentina and from abroad.

Structure and common formats

  • Area codes vary from 2 to 4 digits depending on the size of the locality. Large metropolitan zones typically have shorter area codes.
  • Subscriber numbers occupy the remaining digits so that area code + subscriber = 10 digits total: subscriber lengths are therefore 8, 7 or 6 digits.
  • Trunk prefix for domestic long-distance dialing is 0, which is omitted when dialing from outside Argentina.
  • Country code is +54 for international calls into Argentina.

Common written forms show the area code in parentheses and the subscriber grouped with a hyphen, for example: (11) 1234-5678 for a Buenos Aires number and (264) 123-4567 for a San Juan number. These examples illustrate a 2-digit area code with an 8-digit subscriber, and a 3-digit area code with a 7-digit subscriber, respectively.

How to dial

  • Local calls within the same area code usually require only the subscriber number (no area code).
  • National long-distance calls use the trunk prefix plus area code and subscriber: 0 + area code + subscriber.
  • From abroad: drop the leading 0, add the country code. Format: +54 + area code (without 0) + subscriber.
  • Mobile numbers: in everyday local use many mobile subscribers are dialed with a leading 15 when calling inside Argentina, but when calling from overseas a 9 is inserted after +54 and the 0 and any local '15' are omitted (e.g. +54 9 ... ). Practices vary, so follow the format supplied with a number.

Because area codes differ in length, the grouping shown in printed directories or on business cards helps callers identify the code and subscriber parts quickly. The national plan keeps the full geographic number at ten digits, which simplifies numbering resources and routing despite the variable area code lengths.

For technical details, official guidelines and updates to dialing rules consult the Argentine numbering authority or telecommunications regulator; an overview is available at Argentine numbering plan. For an example of a major city code see Buenos Aires.