UK ZIP Code Lookup

About this calculator

This lookup decodes a UK postcode (marketed here as a ZIP code lookup for search familiarity) into its place and region, using the Royal Mail postcode structure: an outward code — letters identifying the postcode area (e.g. SW for southwest London) followed by digits marking the district — and an inward code narrowing down to a specific street or building group, as in “SW1A 1AA”. Because outward codes map cleanly to post towns and administrative regions, entering just the first part of a postcode is enough to identify the general area.

Online shoppers use it to double-check delivery zones before checkout, UK and international businesses use it to validate customer addresses and estimate shipping costs, logistics and delivery planners use it to sort orders by region, people relocating use it to research which town or county a postcode falls in, and developers use it to test address-entry forms against real postcode formats.