Postal Code 10309 – Rosario, Provincia de San José

Postal Code 10309 for Rosario, Provincia de San José is part of the Costa Rica postal code system, which uses a country-specific postal code format that is not centrally standardised. This country does not use administrative subdivisions to organise its postal codes.

Administratively it is recorded in Provincia de San José within Costa Rica. Postal codes are assigned by delivery route rather than by administrative boundary, so a single code can cover more than one locality and a locality can fall under several codes.

No building-level records are held for this code in the imported dataset, so only the code and its location details are shown. The absence of records does not mean the postal code is unused.

Couriers, e-commerce checkout forms and address autocomplete tools all rely on the postal code to route mail and to check that a stated address matches the code. Because a postal code identifies a delivery area rather than a single building, two addresses that share the same code can still be some distance apart.

Always write Costa Rica Postal Code in full when completing a form, including any leading zero. No postal code format is defined for this country. Data source: a third-party open dataset. This is a reference snapshot, not a live government feed, so confirm the code with the sender, carrier or postal authority before relying on it.