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Population estimates by local health boards, year, sex and age

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Next update expected:July 2026

Updates

8th April 2026
Dataset first published.

Main information

Designation
Accredited official statistics
Data provider
Office for National Statistics (ONS)
Data source
Mid-year population estimates

Overview

Summary of dataset and variables

This dataset provides population estimates for the local health boards in Wales, for the period from mid-2009 onwards by sex and single year of age.

It should be noted that, for mid-2020, there are some definitional changes, particularly affecting the migration components, compared with mid-2019 population estimates data, and it is advised users read the Quality and Methodology Information section on the Office for National Statistics website.

From 1 April 2019, health service provision for residents of Bridgend local authority moved from Abertawe Bro Morgannwg to Cwm Taf. For more information see the joint statement from Cwm Taf and Abertawe Bro Morgannwg University Health Boards (see weblinks). The health board names have changed with Cwm Taf University Health Board becoming Cwm Taf Morgannwg University Health Board and Abertawe Bro Morgannwg University Health Board becoming Swansea Bay University Health Board.

For Wales, the mid-2021 population estimates are the first population estimates to be based on Census 2021.

On 23 November 2023, the dataset from mid-2012 to mid-2020 for Wales and England was rebased to be consistent with the results of Census 2021.

On 15 July 2024, estimates for mid-2022 were revised by the ONS to account for updated estimates of international migration for Wales and England.

On 30 July 2025, estimates for mid-2022 and mid-2023 were revised by the ONS to account for updated estimates of international migration for Wales and England.

Data collection or calculation

The Office for National Statistics (ONS) publish mid-year population estimates for Wales and England as a whole. Further information on how the data are calculated can be found on the ONS' website. A link can be found in the weblink section.

Statistical quality

The ONS publish mid-year population estimates for Wales and England as a whole. Further information on statistical quality can be found on the ONS' website. A link can be found in the weblink section.

Related reports

Published by

Organisation
Welsh Government
Contact email
stats.popcensus@gov.wales