2011 Census Supporting Information
Corrections and Revisions
We have made some small revisions to the files below since they were initially published. For more details please refer to the Geography Revisions and Corrections page.
Supporting Information Products
The following supporting information has been provided in Adobe Acrobat Portable Document Format (PDF) and Excel format.
Background Information on 2011 Census Geographies (PDF 3.0 Mb)
Geography Classifications (PDF 52 Kb)
NRS Frozen Geography policy (PDF 129 Kb)
Best-fit and Exact-fit policy (PDF 1.35 Mb)
Coverage of boundaries (PDF 2.6 Mb)
This file explains the differences between the coverage supplied: Extent of the Realm and Clipped to the coastline.
Administrative boundary changes since 2001 (PDF 27 Kb)
This file provides information about boundary changes since 2001.
Comparison of thresholds (PDF 73 Kb)
Comparison of thresholds Output Area, Datazone, and Intermediate Zone with Office for National Statistics (ONS) Output Area, Lower layer Super Output Area (LSOA), and Middle layer Super Output Area (MSOA).
Output Areas by council area (PDF 10 Kb)
Count of Output areas in each Council area
Islands (PDF 19 Kb)
Lists islands and their 2011 Census populations.
2011 Output Area reference files
Non-contiguous Output Areas (Excel 105 Kb)
List of all non contiguous Output Areas.
Output Areas – Part Removed (PDF 21 Kb)
A list of the output areas and postcodes affected by the removal of smaller parts of non-contiguous output areas that were separated by other output areas.
2011 Output Area code, old to new (Excel 4.01 Mb)
This file provides a look-up between the archived 2011 Output Area (OA) code (published 15 August 2013) and the new 2011 OA code, along with the Council area code they are assigned to.
2001 Output Area Linkage
Linkage Matrix Background Information (PDF 880 Kb)
This file provides a look-up linking the 2001 to 2011 Output Areas.
2001 Output Area to 2011 Output Area - one to one (Excel 4.05 Mb)
This file provides a link between 2001 and 2011 Output Areas using the 2001 master postcode.
2001 Output Area to 2011 Output Area – one to many (Excel 1.01Mb)
This file enables users to identify which 2001 Output Areas make up the 2011 Output Area.
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A list of common definitions and acronyms used in these pages is available on our Glossary page.