National population projections (NPPs) provide an indication of the potential future population size of the UK. A headline only interim release using the latest available population data including Census 2021 (with a planned 2021 base-year) and new international migration assumptions using the latest estimates of international migration. Assumptions for cross border migration, fertility and mortality are reused from 2020-based interim NPPs. NPPs are widely used in planning, for example, fiscal projections, health, education, and pensions.



The United Kingdom Statistics Authority has designated these statistics as National Statistics, in accordance with the Statistics and Registration Service Act 2007 and signifying compliance with the Code of Practice for Official Statistics.

Designation can be broadly interpreted to mean that the statistics:

  • meet identified user needs
  • are well explained and readily accessible
  • are produced according to sound methods
  • are managed impartially and objectively in the public interest

Once statistics have been designated as National Statistics it is a statutory requirement that the Code of Practice shall continue to be observed.