Middle Layer Super Output Areas: 2001 Boundaries for England and Wales

Office for National Statistics provides digital vector boundaries for Middle Layer Super Output Areas in England and Wales, as of 31 December 2001. The dataset contains three boundary versions: full resolution (extent of the realm and coastline-clipped) and a generalised 20m coastline-clipped version. File sizes range from 49 MB to 154 MB.

Use Cases

• Mapping census data based on the provided 2001 Middle Layer Super Output Area boundaries.
• Conducting spatial analysis of socioeconomic indicators using the coastline-clipped boundary versions.
• Creating generalised visualisations for reports using the 20m generalised boundary data.
• Integrating historical administrative geography into GIS projects based on the 2001 snapshot.

Strengths

• Provides three specific boundary versions: full resolution (extent of the realm), full resolution (coastline-clipped), and generalised 20m (coastline-clipped).
• Offers direct download links for ArcGIS REST services, facilitating programmatic access.
• Contains intellectual property rights from both Ordnance Survey and ONS, indicating authoritative sources.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Row count is unknown, which may limit suitability assessment for large-scale analyses.
• Data reflects a snapshot from 2001; freshness should be verified for contemporary applications.

Provenance

Source

Office for National Statistics

Time Range

Snapshot as of 31 December 2001

Freshness

Last updated 2026-07-08 13:31:53.685900; freshness should be verified

Geography

England and Wales