Postinumerot

Postinumerot are numeric identifiers used in the Finnish postal system to designate geographic areas for mail sorting and delivery. They are assigned by the national postal operator Posti and are a fundamental part of Finnish address formatting. Each postinumero corresponds to a specific area, such as a municipality, a city district, or a rural region, which enables mail and parcels to be routed efficiently to their destination.

In Finland, postinumerot consist of five digits. The numbers are organized to reflect geographic regions, with the digits progressively narrowing the delivery area from larger to smaller locations. The system covers the entire country, including metropolitan areas and more sparsely populated regions. Some postinumerot are used for general street delivery, while others may be associated with specific PO boxes or large organizations within a given area.

Beyond delivering mail, postinumerot are widely used in logistics, geographic information systems, statistics, and address validation. They aid in planning services, optimizing routes, and enabling accurate sorting in e-commerce and public administration. They also appear in navigation tools and on forms where users select their location.

Postinumerot are publicly accessible and can be looked up through Posti’s services and various online postcode directories. They play a key role in ensuring efficient handling of physical mail and in supporting accurate location-based data across multiple sectors in Finland.