Luckily, it’s pretty easy to find:
- Select “Consulte de CPA” on the Correo Argentina‘s web site
- Select the Provincia (Ciudad Autónoma de Buenos Aires for Buenos Aires city)
- Select the Localidad (Ciudad Autónoma de Buenos Aires for Buenos Aires city)
- Enter the address. (Street name under “Calle” and street number under “Altura“
- Enter the CAPTCHA code
- Click Consultar
You’ll get a result that looks something like this: C1428AFB
You only need the four digits (1428 in this case) to have the correct postal code, though they have been trying to move people to use the full CPA since 1998.
It’s a simple, but useful site.