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Data Provider: Welsh Government Population projection components of change by local authority and year
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Component 2
Click here to sort2014 to 2015Click here to sort2015 to 2016Click here to sort2016 to 2017Click here to sort2017 to 2018Click here to sort2018 to 2019Click here to sort2019 to 2020Click here to sort2020 to 2021Click here to sort2021 to 2022Click here to sort2022 to 2023Click here to sort2023 to 2024Click here to sort2024 to 2025Click here to sort2025 to 2026Click here to sort2026 to 2027Click here to sort2027 to 2028Click here to sort2028 to 2029Click here to sort2029 to 2030Click here to sort2030 to 2031Click here to sort2031 to 2032Click here to sort2032 to 2033Click here to sort2033 to 2034Click here to sort2034 to 2035Click here to sort2035 to 2036Click here to sort2036 to 2037Click here to sort2037 to 2038Click here to sort2038 to 2039
[Collapse]Population at end of year3,099,8903,108,0543,116,3713,124,7843,133,3363,142,0243,150,8213,159,7163,168,5513,177,1583,185,4673,193,4003,200,8843,207,9273,214,5263,220,6983,226,4673,231,8333,236,8053,241,3903,245,6143,249,5123,253,0973,256,4123,259,522
Population at end of year[Expand]Population at start of period3,092,0363,099,8903,108,0543,116,3713,124,7843,133,3363,142,0243,150,8213,159,7163,168,5513,177,1583,185,4673,193,4003,200,8843,207,9273,214,5263,220,6983,226,4673,231,8333,236,8053,241,3903,245,6143,249,5123,253,0973,256,412
[Expand]Net UK migrants1,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,8101,810
[Collapse]Net overseas migrants3,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,3153,315
Net overseas migrantsInward overseas migrants14,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,10614,106
Outward overseas migrants10,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,79110,791
[Expand]Total fertility rate1.
[Expand]Standardised mortality ratio100.998.095.893.891.889.988.086.184.482.881.179.678.276.875.574.273.071.970.969.868.867.967.166.165.3
[Expand]Expectation of life at birth81.081.381.681.882.082.382.582.883.083.283.583.783.984.184.384.584.784.885.085.285.485.585.685.885.9
[Expand]Special population - armed forces3,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,3953,395
[Expand]Special population - prisoners2,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,0872,087



2014-based local authority population projection components

Last update

September 2016 September 2016

Next update

No longer updated. This will be replaced by a future projection.

Publishing organisation

Welsh Government

Source 1

2014-based projections for local authorities in Wales, Welsh Government

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

This dataset provides the components of change involved in the calculation of the population projections for local authorities in Wales. Data cover the change between each successive projection year and relate to the change from the middle of each year to the middle of the following year. The first year's data represent the change from the base year of mid-2014 to mid-2015, through the projection period to show the change for mid-2038 to mid-2039. This is the fourth set of population projections published for the 22 local authorities in Wales.
Note that the projections become increasingly uncertain the further we try to look into the future.
Also note that these figures differ from the Wales data in the national population projections produced by the Office for National Statistics 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 2014 population estimates have been used as the base for the local authority 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 to four years

Data reference periods

Data are published for the period mid-year 2014 to mid-year 2015 up until mid-year 2038 to mid-year 2039.

Users, uses and context

See the local authority population projection statistical release in weblinks.

Rounding applied

Most data are rounded independently to the nearest whole number and may not add exactly. Standardised mortality ratios, total fertility rates and years of life expectancy estimates are rounded to 1 decimal place and should not be subject to any addition as they are rates.

Revisions information

No revisions have been made to the data published for 2014. These data replaced the 2011 local authority population projections for Wales as the formal estimates of population growth.

Statistical quality

See the local authority population projection statistical release in weblinks.


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