UK National Statistics Postcode Lookup with Geographic Allocations (May 2022)

A National Statistics Postcode Lookup (NSPL) file for the United Kingdom as of May 2022, provided in CSV and TXT formats. The dataset relates current and terminated postcodes to statutory geographies using 'best-fit' allocation from 2011 Census Output Areas, supporting area-based statistics. ONS Geography produces the NSPL quarterly to provide geographic services.

Use Cases

• Aggregate address-level data to higher-level geographies based on the postcode-to-geography mapping.
• Analyze historical postcode coverage and changes based on the inclusion of terminated postcodes.
• Produce area-based statistics for policy or commercial planning based on the 'best-fit' allocation methodology.

Strengths

• File size is 196 MB, indicating a substantial dataset.
• Issued quarterly, suggesting regular updates and maintenance.
• Produced by ONS Geography, an authoritative UK statistical body.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Last updated 2025-08-11 07:51:33; freshness should be verified.
• Row count is 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 postcode and census geography registers.

Time Range

Snapshot as of May 2022.

Freshness

Data snapshot is from May 2022; metadata was last updated in August 2025.

Geography

United Kingdom.