World Postal Code is an online reference service that helps people find ZIP and postal codes for mailing addresses around the world. The site organizes its lookup tools by country and region, covering destinations across North America and the Caribbean, South America, Europe, Asia, Oceania, and Africa. Users can select a country, choose an administrative division, and browse the postal codes available for that area.

For a more direct search, visitors can enter an address in the search field or use the country map to locate a code. The service also provides dedicated navigation for several national systems, including those of the United States, Canada, and the United Kingdom. World Postal Code says its postal code lists draw on GeoNames, other free sources, and manually curated datasets.

Its map geocoding relies mainly on TomTom and HERE, with additional, limited use of Nominatim and OpenStreetMap. The site also provides contact and privacy information and offers its lookup resources to people preparing mail