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...
Explore
- More information
london.zip
Comparison plots for London local authorities and region. Plots are labelled...
Explore
- More information
rest_of_england.zip
Comparison plots for all other local authorities and regions in England....
Explore
- More information
gss_code_to_name_lookup.csv
A lookup of standard geographic codes and names (2021 boundaries)
Explore
- More information

Additional Info

Field	Value
Source	https://data.london.gov.uk/dataset/comparison-of-available-population-estimates-2lwox
Last Updated	January 28, 2026, 13:30 (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	7e1ff00a-a391-405e-8c19-5004466f8da3
harvest_source_id	a3e8ccdb-5c53-4b4b-9db7-ae23b3e3e29f
harvest_source_title	london