This section provides information on the methodology we use to produce our statistics. This includes classifications, harmonisation, best practice, geography and user guidance for a wide range of content. This is also a home to the Census for England and Wales, where you can find information on the 2011 and previous censuses.
Guidance and methodology
Methodology and quality
The methodology used for outputs, the work of the Quality Centre, and an introduction to Methodology at ONS.
Data, analysis and information for 2011 and earlier censuses.
Geographical data and services to support statistics, including maps and digital boundaries, postcode and address searches, and area and place names and codes.
How we classify our statistics, including current, international and National Accounts classifications.
Information on the Harmonisation Programme led by us, to help provide clearer comparisons between data sources.
Information to help users of a wide range of statistics, including guidance on area based analysis, health and life events, Urban Audit, well-being, parliamentary constituencies and natural capital.
How we collect and classify UK data on ethnic group, national identity, religion and sexual identity.
Best practice guidance on how and when to apply disclosure control.
Understanding ONS statistics
An interactive guide to find statistics on UK business published by the Government Statistical Service.
Compendium of UK statistics
Official statistics that can be compared for the four nations of the UK.