The Greek postal code system is administered by ELTA (Ελληνικά Ταχυδρομεία, Hellenic Post).
Each city street or rural region has a unique five-digit number, its Ταχυδρομικός Κώδικας 'postal code' (ΤΚ).
In major cities, the final two digits identify specific post offices.
All postal codes in Greece are numeric consisting of five digits.
Until 1983 local three-digit systems existed in Athens and other cities.