2011 United Kingdom census
A census of the population of the United Kingdom is taken every ten years. The 2011 census was held in all countries of the UK on 27 March 2011. It was the first UK census which could be completed online. The Office for National Statistics is responsible for the census in England and Wales, the General Register Office for Scotland  is responsible in Scotland, and the Northern Ireland Statistics and Research Agency is responsible  in Northern Ireland.