ONS Open Geography Portal (link)

All the latest ONS geographic products, maps and APIs

ONS Postcode Directory Tool (link)

Postcode Directory Look-up Tool

ONS Postcode Directory Tabular and Spatial Extract Tool (link)

Allows users to download all the postcodes for a Local Authority, rather than having to download the postcode file for the whole of the UK and then filter.

All Bucks Postcodes May 2026 (xlsx file)

A list of all Buckinghamshire postcodes.

Opportunity Bucks Postcodes May 2026 (xlsx file)

A list of all Buckinghamshire postcodes in the 14 Opportunity Bucks wards.

Local Council areas (map)

Map showing local authority areas.

International Territorial Level 3 areas (various file formats)

ITL3 names and codes

Lower Layer Super Output (LSOA) areas (map)

Zoom in view area of interest

Middle Layer Super Output (MSOA) areas (Map)

Zoom in to view area of interest