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Data Provider: Welsh Government National Statistics Population projections by year and gender
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2016-based national population projections for Wales, 2016-2041

Last update
July 2018 July 2018

Next update
Not updated, this will be replaced by a future projection.

Publishing organisation
Welsh Government

Source 1
2016-based national population projections for Wales, Office for National Statistics

Contact email

National Statistics

Lowest level of geographical disaggregation

Geographical coverage

Languages covered
English and Welsh

Data licensing
You may use and re-use this data free of charge in any format or medium, under the terms of the Open Government License - see

General description
The Office for National Statistics (ONS) produces national population projections for Wales, and the other UK countries (Release date: 26 October 2017). This dataset provides the Wales data from that source by gender, single year of age and each year from the base year of 2016, through the projection period to 2041.

Note that the projections become increasingly uncertain the further we try to look into the future.

Note also that these figures differ from the Wales data in the local authority population projections because the key aim of the local authority population projections is to produce robust local authority population projections for Wales, which reflect local trends in recent years while the main purpose of the national projections is to produce robust population projections for Wales which reflect national trends in recent years.

The national projections and the local authority projections are different for two main reasons:

1. The methodology used to produce assumptions in the local authority projections are different to those used in the national projections. Some of these are due to slightly different data sources.

Also, although one set of assumptions may fit well for a national trend, using similar assumptions may not always produce feasible results for all local authority areas because of the different nature and trends between local authorities.

2. The geographical level for which the assumptions are based and applied is also important. For example, it is not appropriate to sum local rates (eg fertility) to derive a national rate, and therefore a model operating at different geographic levels (but using rates) will produce different results for the different geographic levels.

Data collection and calculation
Population projections provide estimates of the size of the future population, and are based on assumptions about births, deaths and migration. The assumptions are based on past trends. Projections only indicate what may happen should the recent trends continue. Projections done in this way do not make allowances for the effects of local or central government policies on future population levels, distribution and change.

The 2016 national population estimates have been used as the base for these national projections. The projected population is for 30 June each year. The base population estimates are based on the usually resident population. Usual residents away from home temporarily are included, but visitors are excluded. Students are counted at their term-time address. It should also be noted that the UN definition of an international migrant is used - those changing country of residence for a period of at least 12 months. Short-term migrants (eg migrant workers from Eastern European countries) are not counted in the population estimates and hence are not included in the population projections.

Frequency of publication
Every two years

Data reference periods
Data are published for the period 2016 to 2041.

Users, uses and context
See weblinks.

Rounding applied
Data are rounded independently to the nearest whole number and may not add exactly. Mean and median ages are rounded to 2 decimal places and are not additive.

Revisions information
No revisions have been made to the data published for 2016. These data replaced the 2014 national population projections for Wales as the formal estimates of population growth.

Statistical quality
See weblinks.

Population projections; population growth; migration; natural change; births; deaths