The smallest Census Area used, NRS created Output Areas (OAs) for the 2011 Census to allow comparability with OAs for the 2001 Census. The OAs were created as groups of postcodes nesting as well as possible into the following areas: Council Area (CA), and 2010 locality.
Any area for which Census output is produced is the aggregation of Output Areas (OAs) that approximate best to the area.
More information on Output Areas can be found in the 2011 Census Geography Background Information note within the 2011 Census Supporting Information section of the NRS website.
Boundaries and Indexes for 2011 Output Areas are available via the 2011 Census Geography homepage on the NRS website.