National Statistics UPRN Lookup (October 2025) (Epoch 121) V2

Great Britain's National Statistics UPRN Lookup (NSUL) relates Unique Property Reference Numbers (UPRNs) from AddressBase® Epoch 121 to a range of statutory administrative, electoral, health, and other statistical geographies as of October 2025. The dataset is produced by ONS Geography and uses 'best-fit' allocation from 2021 Census output areas, with updates issued every six weeks. This Version 2 file uses a revised methodology to correct issues in some geography allocations from a previously published version.

Use Cases

• Link individual addresses to local authority and electoral ward boundaries based on the UPRN-to-geography mapping.
• Analyze public health statistics by relating property locations to health geographies mentioned in the description.
• Perform demographic analysis by assigning census output areas to specific addresses via the 'best-fit' allocation.
• Integrate address-level data with National Park and Workplace Zone geographies using the 'exact-fit' allocations.
• Update and correct geographic analyses using the provided files listing UPRNs with changed geography assignments.

Strengths

• File size is 438 MB, indicating a substantial dataset.
• Uses a revised methodology (Version 2) to correct previous geography allocation issues.
• Includes supplementary files detailing differences between the revised and previous versions.
• Geographic coverage is explicitly for Great Britain as of October 2025.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

Office for National Statistics (ONS) Geography

Collection Method

Produced by relating UPRNs from Ordnance Survey AddressBase® Epoch 121 to geographies via 'best-fit' allocation from 2021 Census output areas.

Time Range

Snapshot as of October 2025.

Freshness

Updated every 6 weeks; snapshot as of October 2025.

Geography

Great Britain