The census in the United Kingdom is decennial, that is, held every ten years, although there is provision in the Census Act 1920 for a census to take place at intervals of five years or more.
There have only been two occasions where the census has not been decennial: There was no census in 1941 due to the war; and a mini-census using a ten percent sample of the population was conducted on 24 April 1966.
This bulletin presents the key messages from the first release of 2011 Census data for the UK.
It describes the usually resident population of the UK and its constituent countries, by age and sex, and provides information on how the population has changed over time.
Censuses were undertaken by the Office for National Statistics in England and Wales, National Records of Scotland, and the Northern Ireland Statistics and Research Agency.
The 2011 Census data for the UK are based on the combined results of these individual censuses, which were all held on 27 March 2011.
The 2011 Census outputs for the UK are delivered by the Office for National Statistics.
Back to table of contents The UK population was 63,182,000 in 2011.
This is the first population estimate for the UK to be produced from all three 2011 Censuses, which were conducted on 27 March 2011.
This release includes estimates of the usually resident population of the UK and its constituent countries, by sex and five-year age band.
This bulletin follows the first release of statistics for England and Wales and for Northern Ireland on 16 July 2012 and for Scotland on 17 December 2012.