SI 66
The SI 66 postcode zone is centred around Koper. It represents 1 postcode-locality records in the source data.
The reference centre is calculated from available postcode locations and is not an official administrative boundary.
Using SI 66 in logistics
Freight planners commonly use leading postcode characters to describe a broad collection or delivery area. The SI 66 prefix gives a quick geographic reference around Koper, while the interactive map helps teams compare it with other European regions.
Always confirm the complete postcode, street and delivery address before pricing, routing or dispatching a vehicle. Prefix zones are planning references and may not follow administrative boundaries.
Places associated with SI 66
These examples show complete postcodes and localities grouped into the broad SI 66 reference zone. Coverage is illustrative rather than an official or exhaustive delivery list.
Reference data: GeoNames postal code files. Dataset updated 2026-09-07. A match is not delivery validation.