Population and Migration Methodology

Methodology and background information for ONS's population and migration statistics, including population estimates and population projections.

Guidance and methodology on health and life events statistics including births and conceptions, marriages, deaths and mortality can be found at the User Guidance area of the website.

• An overview of ONS's population statistics

  An overview of ONS's population statistics including population estimates, population projections, migration and the census

• Demography

  Guides on the methods used by ONS to calculate demographic statistics

• Electoral Statistics

  Information and guidance on European and UK electoral statistics

• Future plans for population statistics

  Details of proposed projects and information on how ONS plans on improving the quality of its population, migration and demography statistics

• International Migration methodology

  Information on the methodology used for International Migration statistics

• National Statistics Centre for Demography Advisory Board (NSCD AB)

  National Statistics Centre for Demography Advisory Board (NSCD AB) meeting minutes

• Population estimates methodology

  Methodology behind ONS's production of mid-year population estimates

• Population Projections

  Information and guidance on population projections and the methodology used to produce population projections.

• Short-term Migration Methodology

  Methodology and guidance relating to Short-term Migration statistics

• UK Population Committee (UKPC)

  UK Population Committee (UKPC) meeting minutes

• Population Statistics Research Unit (PSRU)

  Information, latest news and publications from the Population Statistics Research Unit

• Internal Migration Methodology

  Information on the methodology used for Internal Migration statistics