OA to Westminster Constituency Best Fit Lookup for England and Wales (2011-2024)

Government Digital Service provides a 'best fit' lookup table linking 2011 Census Output Areas (OA11CD) to Westminster Parliamentary Constituencies as of July 2024 (PCON24CD, PCON24NM, PCON24NMW) for England and Wales. The dataset was last updated on 2025-05-20. It contains text fields with specified lengths, such as a 9-character code for constituencies and a 40-character name field.

Use Cases

• Aggregating census or survey data from Output Areas to Parliamentary Constituencies based on the provided lookup codes.
• Mapping socio-economic indicators to electoral boundaries for political or demographic analysis.
• Joining other datasets using the OA11CD or PCON24CD identifiers to enable cross-boundary analysis.
• Validating or creating constituency-level summaries from finer-grained geographic data.

Strengths

• Provides a direct mapping between two key UK geographic hierarchies: 2011 Output Areas and 2024 Parliamentary Constituencies.
• Field lengths are explicitly defined (e.g., 9 characters for codes, 40 for names), suggesting structured data.
• Sourced from the Government Digital Service via the UK's official statistics geoportal.

Limitations

• Row count is unknown, which may limit suitability assessment for large-scale joins.
• Column-level documentation is absent; field semantics must be inferred after download.
• The 'best fit' methodology implies some approximation; exact geographic alignment may not be perfect.

Provenance

Source

Government Digital Service

Collection Method

Likely generated by statistical boundary matching ('best fit') methodology.

Time Range

Links 2011 geographies to July 2024 constituency boundaries.

Freshness

Last updated 2025-05-20 09:47:38.080000

Geography

England and Wales