National Statistics Postcode Lookup: UK Postcode to Geography Mapping, February 2018

A 375 MB file containing the National Statistics Postcode Lookup (NSPL) for the United Kingdom as of February 2018. It relates current and terminated postcodes to statutory geographies via 'best-fit' allocation from 2011 Census Output Areas, supporting area-based statistics. The NSPL is produced by ONS Geography and issued quarterly.

Use Cases

• Generate area-based statistics from postcoded data based on the 'best-fit' allocation method.
• Map postcodes to current statutory geographies for demographic or economic analysis.
• Analyze historical postcode changes and terminations based on the inclusion of terminated codes.
• Support geographic services and applications requiring precise UK location-to-area mapping.

Strengths

• File size of 375 MB suggests a detailed and granular dataset.
• Includes both current and terminated postcodes, providing historical context.
• Links postcodes to multiple statutory geographies via a documented 'best-fit' allocation method.
• Produced and maintained quarterly by ONS Geography, an authoritative source.

Limitations

• Description metadata is limited; actual data quality and column definitions require manual inspection after download.
• Data is from February 2018, which may be outdated for current analyses; freshness should be verified.
• Row count and specific column names are unknown, which may limit suitability assessment.

Provenance

Source

Office for National Statistics (ONS) Geography, via the Government Digital Service.

Collection Method

Likely compiled from official UK postal and census data.

Time Range

Snapshot as of February 2018.

Freshness

Issued quarterly; snapshot is from February 2018. Last metadata update was 2025-08-11.

Geography

United Kingdom.