A nationwide census, known as Census 2001, was conducted in the United Kingdom on Sunday, 29 April 2001. This was the 20th UK census and recorded a resident population of 58,789,194. The 2001 UK census was organised by the Office for National Statistics (ONS) in England and Wales, the General Register Office for Scotland (GROS) and the Northern Ireland Statistics and Research Agency (NISRA). Detailed results by region, council area, ward and output area are available from their respective websites.