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We moved them to The National Archives website, to keep this website as responsive as possible.
Please note: all historical data is still on this website.
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Dewis pwnc arall neu clirio pob hidlydd.
Quality and methodology information for national population projections, detailing the strengths and limitations of the data, methods used and data uses and users.
The data sources and methodology used to produce mortality assumptions in the 2024-based national population projections.
The data sources and methodology used to produce fertility assumptions in the 2024-based national population projections.
The variant projections, a range of scenarios with alternative demographic assumptions, used in the 2024-based national population projections.
The data sources and methodology used to produce migration assumptions in the 2024-based national population projections.
A research evaluation comparing the accuracy of the admin-based population estimates (ABPEs) and mid-year population estimates (MYEs) for England and Wales.
Quality and methodology information for the Annual Population Survey. Includes strengths and limitations, methods, and data uses and users.
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.
Quality and methodology information (QMI) for annual mid-year population estimates of the very old, including centenarians. Includes strengths and limitations, methods, and data uses and users.
What the population estimates by marital status and living arrangements cover, how we produce them, and their quality and comparability. Includes definitions and latest, past and upcoming changes.
