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Argentina código postal validator
How the código postal format works
- Format
- CPA format — 1 letter + 4 digits + 3 letters (e.g. C1425DGH); older bare 4-digit codes are also accepted
- Example
- C1425DGH
Things to watch for
- Format-only check — does not confirm the código postal actually exists
- The leading letter in a CPA is a province code (C = Ciudad Autónoma de Buenos Aires); the three trailing letters pin down a side of the street, introduced in the 1999 CPA reform
- The old 4-digit-only postcode (e.g. 1425) still works for many services and is accepted alongside the newer CPA form
^([A-Z][0-9]{4}[A-Z]{3}|[0-9]{4})$An Argentine código postal (CPA) is the address code Correo Argentino uses to route mail, combining a province letter, a 4-digit legacy postal zone, and a 3-letter street-side suffix — for example C1425DGH in Recoleta, Buenos Aires. The 1999 CPA reform layered these letters onto the country’s older 4-digit system specifically to resolve ambiguity in large cities, where a single 4-digit zone could span thousands of addresses on both sides of a wide avenue. Anyone validating an Argentine shipping address, checkout form, or spreadsheet of customer records benefits from checking the shape before it’s trusted, especially since two valid formats are both still in circulation.
A common mistake is typing only the 3-letter suffix or only the province letter rather than both, or dropping the province letter entirely and submitting a 7-character code that looks plausible but is missing a piece. Because CPA mixes letters and digits in an unusual pattern, a shape check catches truncated or malformed entries that a human reviewer might skim past.
How this validator works
This tool accepts either the full CPA form — a province letter, exactly 4 digits, and a 3-letter street-side suffix — or the older bare 4-digit code on its own, and rejects half-formed combinations of the two, entirely in your browser with nothing sent to a server.
What a pass doesn’t tell you
CPA carries no check digit, so matching the expected shape is the most a client-side tool can confirm — not that Correo Argentino has assigned it to a real address or that the letters correctly identify an actual province and street side. Confirming that requires Correo Argentino’s own CPA lookup tool.
Scope: this page and tool cover CPA format validation only — not address lookup, province-letter verification, or confirming a code is currently in use.
código postal FAQ
What does the CPA format actually encode?
CPA stands for Código Postal Argentino. In C1425DGH — a real Recoleta, Buenos Aires code — the leading C identifies the Ciudad Autónoma de Buenos Aires, the middle 1425 is the legacy 4-digit postal zone that existed before the reform, and the trailing DGH pins down which side of the street a building sits on.
Do I still need to use the old 4-digit code, or is CPA mandatory?
Correo Argentino introduced the CPA format in 1999, but the older bare 4-digit code (e.g. 1425) is still recognized for most purposes, so this validator accepts either an old-style 4-digit code or a full CPA.
Does a correctly formatted CPA mean it actually exists?
No. This tool only confirms the string matches the expected letter-digit-letter shape — it doesn't check it against Correo Argentino's actual assignment list. Confirming a CPA is real requires Correo Argentino's own CPA lookup.