Methodology related to population estimates

The administrative data sources that were used in the statistical design for Census 2021, with information on their coverage, accuracy, and timeliness.

Developments in producing mid-2021 population estimates rolled forward from Census 2021, by local authority district, age, and sex. Includes method changes needed to roll forward the three months from Census Day to mid-year and discusses our ongoing challenges.

A comparison of the different types of population estimate that are planned for or are published in 2022 and early 2023. Includes information about whether these are official estimates of the population or used only for wider research, as well as the sources, coverage and main uses and comparability issues for the estimate.

Details the strengths, limitations, uses, users and methods used for Census 2021, England and Wales.

How we maximised the quality of Census 2021 population estimates during the processing and quality assurance of the final statistics.

Interactive tool to help local authorities compare age-sex estimates and comparator data from Census 2021 to other areas within England and Wales.

Quality and methodology information for Population estimates by marital status and living arrangements, detailing the strengths and limitations of the data, methods used, and data uses and users.

Methods used to produce the population estimates of the very old (aged 90 years and over) by single year of age and sex, UK, England, and Wales.

Quality and methodology information for national population estimates broken down into small geographical areas (Super Output Areas, health geographies, electoral wards, Parliamentary constituencies and National Parks) in England and Wales. Details the strengths and limitations of the data, methods used, and data uses and users.

Methodology for national population estimates broken down into small geographical areas – Super Output Areas, health geographies, electoral wards, Parliamentary constituencies and National Parks.