Date published:
Statistics:
Census 2021,
Census 2021 results,
Census 2021 reference materials
Explore how the census questionnaire evolved over a decade.
Overview
This report details key differences between the 2011 and 2021 Census questionnaires in Northern Ireland, helping users understand where changes in definitions or response options - not population shifts - may explain differences in results.
The report highlights:
- Changes in question wording, structure, and content
- Impacts on data comparability
- Rationale for additions, removals, or updates
An outputs comparability document will follow shortly. It will identify the equivalent census table produced in 2011, indicating any differences, and whether the output is comparable.