Middle Layer Super Output Areas: 2001 Clipped 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 includes full-resolution and generalised (20m) boundaries, clipped to the coastline. It contains both Ordnance Survey and ONS Intellectual Property Rights.

Use Cases

• Create census data visualizations based on the provided 2001 administrative boundaries.
• Perform spatial joins for demographic analysis using the generalised (20m) clipped boundaries.
• Map regional socio-economic indicators based on the Middle Layer Super Output Area geography.

Strengths

• Provides three specific boundary versions: full resolution (extent of realm), full resolution (clipped), and generalised 20m (clipped).
• Contains intellectual property rights from both Ordnance Survey and the Office for National Statistics.
• Offers direct access via multiple ArcGIS REST service URLs for programmatic use.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data is specific to a single snapshot date (31 December 2001), limiting temporal analysis.
• Row count is unknown, which may limit suitability assessment for large-scale processing.

Provenance

Source

Office for National Statistics

Collection Method

Likely digitized and generalized from official cartographic sources.

Time Range

As of 31 December 2001

Freshness

Last updated 2026-07-08 13:33:10.440671; freshness should be verified.

Geography

England and Wales