Post offices are located in numerous locations ins Buenos Aires. The hours are weekdays from 10am to 8pm and Saturday from 10am until 1pm. The main post office (Correo Central) is located at Av. Sarmiento 151 (tel. 11/4311-5040). In addition, the post office works with locutorios that offer limited mailing services.

Airmail postage for a letter 20 grams or less from Argentina to North America, Europe and other countries is 4 pesos, or about US$1.35 (80p).  Other letter prices are relatively high: a 30-gram letter is about US$3 (£1.60). Parcel rates, on the other hand, are as little as US$15 (£7.95) for a one-kilogram package.

Mail requires between seven to 10 days to reach the United States or Europe.

The OCA is a private postal service with significantly more expensive mailing rates than the government post office.