National Statistics Postcode Lookup: UK Geographic Linkages

The dataset provides a snapshot as of February and May 2026, linking UK postcodes to statutory geographies. It relates both current and terminated postcodes to areas like Census Output Areas, national parks, and Workplace Zones using 'best-fit' and 'exact-fit' allocation methods. Produced by ONS Geography and issued quarterly, it supports the generation of area-based statistics from postcoded data.

Use Cases

• Aggregating customer addresses to local authority districts based on postcode linkage.
• Producing health statistics for specific regions by linking patient postcodes to census geographies.
• Analyzing market penetration by assigning sales postcodes to parliamentary constituencies.
• Mapping service coverage by relating terminated and active postcodes to workplace zones.

Strengths

• Covers all constituent countries of the United Kingdom: England, Wales, Scotland, and Northern Ireland.
• Includes both current and terminated postcodes, providing historical continuity.
• Links to current statutory geographies derived from the authoritative 2021 Census.
• Available via API as a hosted table, indicating machine-readable access.

Limitations

• Specific column names and a precise row count are not provided in the source metadata.
• Conflicting temporal references exist, with sources citing both 'February 2026' and 'May 2026' snapshots.
• The license terms and exact file size for the May 2026 version are not stated.

Provenance

Source

Office for National Statistics (ONS Geography)

Collection Method

Produced via 'best-fit' allocation from 2021 Census Output Areas, with specific 'exact-fit' rules for national parks and Workplace Zones.

Time Range

Snapshot as of February 2026 and May 2026.

Freshness

Last updated metadata indicates 2026-06-03, with data snapshots from early-mid 2026.

Geography

United Kingdom (England, Wales, Scotland, Northern Ireland)