This dataset provides the components of change within the official population estimates for the local authorities in Wales. These estimates are consistent with the results of the 2011 Census and show the contributions that natural change (births less deaths); different elements of migration and other smaller adjustments make to the changing population estimates in each local authority over the period since 1991. The mid-2020 population estimates are the first population estimates to show some of the impacts of the coronavirus (COVID-19) pandemic. However, these estimates refer to the population as at 30 June 2020, meaning that they only account for the first three months of the pandemic. Future releases of the population estimates will provide information on the impact from mid-2020 onwards. It should be noted that there are some definitional changes for mid-2020 (particularly affecting the migration components) compared to mid-2019 populations estimates data and it is advised that users read the Quality and Methodology Information section on the Office for National Statistics website. This material is Crown Copyright and may be re-used (not including logos) free of charge in any format or medium, under the terms of the Open Government Licence.