Estimates of London's population between 1801 and 2021 (persons present 1801 to 1971 and usual residents for 1981 to 2021) derived from historic Census data. Figures for years before 1931 are estimates by the Greater London Council published in Research Memorandum 413, 'The Changing Population of the London Boroughs'. Figures for 1931, 1951, and 1961 were published in 'Census 1961 Greater...

This report from the GLA Intelligence Unit compares 2011 census estimates of the population aged 0-18 to the following alternative data sources: ONS 2010 based sub-national population projections (SNPP); GLA 2011 round population projections; General Practitioner registrations; and Child benefit claims.