Comparison of available population estimates

At the April 2023 meeting of the Population Statistics User Group, the GLA Demography team presented an overview of currently available sources of population estimates for the previous decade, namely:

The original ONS mid-year population estimates (including rolled-forward estimates for 2021) Experimental outputs from the ONS's Dynamic Population Model

The modelled population backseries produced by the GLA to act as inputs to our 2021-based interim population projections

The slides from the presentation are published here together with packages of comparison plots for all local authority districts and regions in England to allow users to easily view some of the key differences between the sources for their own areas. The plots also include comparisons of the Dynamic Population Model's provisional 2022 estimates of births with the modelled estimates of recent births produced by the GLA.

Data and Resources

2023_04_04_PSUG_Population_Estimates.pdf
Presentation from the April 2023 meeting of the Population Statistics User...
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london.zip
Comparison plots for London local authorities and region. Plots are labelled...
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rest_of_england.zip
Comparison plots for all other local authorities and regions in England....
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gss_code_to_name_lookup.csv
A lookup of standard geographic codes and names (2021 boundaries)
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Additional Info

Field	Value
Source	https://data.london.gov.uk/dataset/comparison-of-available-population-estimates-2lwox
Last Updated	December 17, 2025, 13:10 (UTC)
Created	October 22, 2025, 12:06 (UTC)
GUID	2lwox
Language
dcat_issued	2023-04-05T19:14:23.000Z
dcat_modified	2023-04-05T19:26:55.000Z
harvest_object_id	06b0ee1e-e418-4f0f-95d8-b04efd2ff06d
harvest_source_id	a3e8ccdb-5c53-4b4b-9db7-ae23b3e3e29f
harvest_source_title	london