However, no official transition date has been set; the current 4-digit system remains fully in effect.
| Feature | Tbilisi (Georgia) | USA (ZIP) | UK (Postcode) | Germany (PLZ) | |---------|------------------|-----------|---------------|----------------| | Format | 4 digits | 5 digits | Alphanumeric (e.g., SW1A 1AA) | 5 digits | | Granularity | District level | Street/block level | Street/sometimes building | Street/block | | Changes frequently? | No (since 2015) | Rarely | Occasionally | Rarely | zip code tbilisi