UK Overseas National Insurance Registrations by Borough and Origin Country

UK-wide data on National Insurance Number registrations for adult overseas nationals, sourced from the Department for Work and Pensions' National Insurance Recording System. Figures are rounded to the nearest ten and cover financial years from April to March. The dataset is maintained by the Greater London Authority and was last updated in June 2026.

Use Cases

• Analyze trends in overseas national arrivals based on year of registration data.
• Model the geographic distribution of new registrants based on recorded postcode.
• Compare inflows of overseas nationals by country of origin over time.
• Assess local authority-level impacts of immigration using borough and MSOA-level counts.

Strengths

• Data is a 100% extract from the official National Insurance Recording System.
• Figures are provided at multiple geographic levels including borough and MSOA.
• Time series data is organized by financial year for consistent comparison.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• A small number of registrations have an unknown geography and are excluded from the geographic tables.

Provenance

Source

Department for Work and Pensions (DWP) National Insurance Recording System.

Collection Method

Administrative records from the National Insurance Recording System, with geography assigned by matching postcodes.

Time Range

Financial years (1st April - 31st March).

Freshness

Last updated 2026-06-24 21:07:30.720528; freshness should be verified.

Geography

United Kingdom, with breakdowns by borough and Middle Layer Super Output Area (MSOA).