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    Argentina Postal Codes and Addresses Guide

    How Argentina's four-digit postal codes and the longer CPA work, how Argentine addresses are written, and how a UPCS exact-location code fits in.

    Updated 14 October 2026 · 3 min read

    Argentina has two postal code formats in use side by side. The older code has four digits. The newer Código Postal Argentino (CPA) wraps the same four digits with a letter at the start and three letters at the end, as in C1425ABC. The national postal operator is Correo Argentino.

    How the national system works

    The four-digit code identifies a locality or a district within a city, and it is still the form most people know and write. The CPA, introduced to make sorting more precise, adds a leading letter that corresponds to the province (for example, C for the Autonomous City of Buenos Aires and B for the Province of Buenos Aires) and a final group of three letters that identifies a block face, meaning one side of a street segment. See Argentina postal code format for the full explanation.

    How addresses are written

    An Argentine address puts the street name first, then the number, then floor and apartment, followed by the postal code, locality and province:

    Jane Doe
Avenida Ejemplo 1234, Piso 5, Depto B
C1425ABC Ciudad Ejemplo
Provincia
ARGENTINA

    Street names are often dedicated to people or dates, and they carry the street type such as Calle, Avenida or Pasaje. More is in how to write an address in Argentina.

    How UPCS codes work in Argentina

    UPCS (Universal Post Code System) assigns a short code to an exact map point. In Argentina, the code starts with AR, then two blocks of letters and digits, as in AR-XXXX-XXXX (a placeholder). Each code stands for a 3 m by 3 m cell, and identical coordinates always return the same code.

    A UPCS code is not an official postal code and is not issued by Correo Argentino or any government body. It does not replace the four-digit code or the CPA. It travels beside a regular address, to mark a gate, an entrance or a rural access that is hard to describe.

    Why both codes matter online

    Online shops in Argentina often use the postal code to quote shipping, so entering the wrong one can change the price or delivery zone. Customers who know both forms should supply whichever the form asks for. Neither code identifies a single doorway, which is why a street, number, floor and apartment are still essential.

    In this guide

    Four more pages complete this section. Postal code format separates the old code from the CPA. Address format gives the line order and conventions for floors and apartments. Find a postal code explains lookup. Delivery and addressing deals with practical challenges. All other countries are on the countries hub.

    In this guide

    Argentina Postal Code Format: CPA and Four-Digit CodesLearn the two Argentine postal code formats: the older four-digit code and the CPA with letters, what the parts mean and common entry mistakes.Argentina Address Format: How to Write ItHow to write an Argentine address: street name and number order, floor and apartment notation, postal code placement, province and an example.How to Find a Postal Code in ArgentinaHow to find and verify an Argentine postal code or CPA using the national postal operator's directory, existing mail and the full address.Argentina Delivery and Addressing ChallengesDelivery and addressing challenges in Argentina: two postal code formats, long distances, rural addresses and how an exact-location code can help.

    Frequently asked questions

    Which postal code do people in Argentina actually use?

    Many people and forms still use the older four-digit code. The longer CPA, which adds a leading letter and three trailing letters, exists for more precise sorting and appears on many forms.

    What do Argentine UPCS codes look like?

    They start with the prefix AR followed by two blocks of letters and digits, as in AR-XXXX-XXXX. They are not official postal codes.

    Related reading

    Iran Postal Codes and Addressing GuideHow Iran's ten-digit postal code and Persian address structure work, and how a UPCS IR code can mark an exact building entrance or gate.Italy Postal Codes and Addressing GuideHow the Italian CAP and addresses work, from street-then-number order to province abbreviations, and how a UPCS IT code complements them.Japan Postal Codes and Addressing GuideHow Japan's seven-digit postal code and block-based address system work, and how a UPCS code can add an exact location to a Japanese address.Mexico Postal Codes and Addresses GuideHow Mexico's five-digit código postal system works, why the colonia matters in a Mexican address, and how a UPCS exact-location code fits in.