The UK censuses took place on 29th April 2001. They were run by the Northern Ireland Statistics & Research Agency (NISRA),  General Register Office for Scotland (GROS), and the Office for National Statistics (ONS) for both England and Wales. The UK comprises the countries of England, Wales, Scotland and Northern Ireland.Statistics from the UK censuses help paint a picture of the nation and how we live. They provide a detailed snapshot of the population and its characteristics, and underpin funding allocation to provide public services. The aggregate statistics produced as outputs from UK censuses provide information on a wide range of demographic and socio-economic characteristics of the population of the United Kingdom. They are predominantly a collection of aggregated, or summary counts of the numbers of people, families or households resident in specific geographical areas or ‘zones’ possessing particular characteristics, or combinations of characteristics drawn from the themes of population, people and places, families, ethnicity and religion, health, work, and housing. Aggregate statistics are available for the full range of geographies employed within the census, from the smallest (output areas with an average of 150 persons in England and Wales), to national level. For further information about the geographies used in the output of census aggregate statistics, see the section on census geography in the Office for National Statistics’ Beginner’s Guide to UK Geography. Data can be accessed through InFuse. Citation Through InFuse: Office for National Statistics (2011): 2001 Census aggregate data (Edition: May 2011). UK Data Service. DOI: https://doi.org/10.5257/census/aggregate-2001-2 Through Casweb: Office for National Statistics; General Register Office for Scotland; Northern Ireland Statistics and Research Agency (2005): 2001 Census aggregate data (Edition: 2005). UK Data Service. DOI: https://doi.org/10.5257/census/aggregate-2001-1 The aggregate statistics outputs from the 2001 Census are available in three main datasets: Key Statistics - summary tables covering the most significant and requested countsStandard Tables - the most detailed of the aggregate statistics tables (not produced for the smallest geographical areas used in the census)Census Area Statistics - mostly versions of the Standard Tables for smaller areas, but containing less detail