Argentina replaced its old four-digit codes with the alphanumeric CPA, which encodes the province and delivery zone in eight characters. Using the legacy short code or dropping the province is the usual cause of misrouting. Here is the format and how to validate it.
An Argentine label is recipient, the street with its number and floor, then the CPA with the city, then the country.
María González personal or business recipientAv. Corrientes 1234, Piso 5 street name, number, then floor (<code>Piso</code>) and unit (<code>Depto</code>) if anyC1043AAZ Ciudad Autónoma de Buenos Aires the eight-character CPA, then the localityBuenos Aires the province, unless it is the autonomous cityARGENTINA required for inbound international shipmentsThe Código Postal Argentino (CPA) encodes the province in its first letter and the block face in its final three letters, so it routes more precisely than the old four-digit code.
The country-specific rules that generic autocomplete and single-line address fields tend to get wrong.
The modern CPA is a letter, four digits, then three letters (C1043AAZ). The first letter is the province; the final three letters pinpoint the block, so the full code routes better than the old four digits.
Many customers still enter the pre-1998 four-digit code (1043). It maps to the CPA's middle digits but drops the province and block letters, so it should be upgraded to the full CPA.
Argentine addresses note the floor (Piso 5) and apartment (Depto B) after the street number. Merging them into the street text confuses couriers.
The Ciudad Autónoma de Buenos Aires (CABA) is distinct from Buenos Aires province. The CPA leading letter C marks the city, so the province line should not repeat it.
Each of these passes a basic "is this field filled in" check but fails at the carrier, turning into a redelivery, a return, or an address correction fee.
1043 instead of C1043AAZ loses province and block-level routing.González and Gonzalez across systems can cause mismatches.How the major carriers handle Argentina addresses, and what your label needs to satisfy each one.
The national postal operator and a common last-mile partner. It routes on the CPA, so the full eight-character code is the most important field to validate.
Major domestic couriers for ecommerce. They expect the full street, floor and unit, CPA, and locality for accurate delivery.
International carriers for inbound shipments. Include the country line; an accurate CPA avoids customs and routing delays.
Address Guard checks Argentina addresses against carrier and postal databases before the order ships, normalizes the format, and flags the errors that cause failed deliveries. 240+ countries, $0.05 per check.
Part of the Address Guard international address format guide, covering 240+ countries.