Population in Cardiff
Population in Cardiff was 381,516 in 2025, according to the Office for National Statistics (United Kingdom). That is down 0.1% from 2024.
Population in Cardiff, 2011 to 2025
All 15 values
| Period | persons |
|---|---|
| 2025 | 381,516 |
| 2024 | 382,028 |
| 2023 | 379,539 |
| 2022 | 369,640 |
| 2021 | 359,824 |
| 2020 | 360,287 |
| 2019 | 357,137 |
| 2018 | 355,125 |
| 2017 | 354,348 |
| 2016 | 352,982 |
| 2015 | 351,600 |
| 2014 | 350,949 |
| 2013 | 349,982 |
| 2012 | 348,084 |
| 2011 | 345,442 |
Compared with Wales
| Place | 2025 |
|---|---|
| Cardiff | 381,516 |
| Wales | 3,175,181 |
Rankings
Definition
Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). Norway: Statistics Norway, 1 January. United States: Census Bureau population estimates for 1 July. United Kingdom regions and local authorities: Office for National Statistics estimates for 30 June. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.
The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.
How to cite
Office for National Statistics. Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM_2002_1). Contains public sector information licensed under the Open Government Licence v3.0. https://www.nomisweb.co.uk/api/v01/dataset/NM_2002_1.data.json?geography=TYPE480,TYPE424&gender=0&c_age=200&measures=20100&time=2011,latest. Retrieved 2026-10-11.Use this data in your AI agent
Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:
What is the latest population in Cardiff? Cite the source.
get_value {"indicator":"population","place":"gb-la-w06000015"}
GET https://invokely.ai/api/v1/value?indicator=population&place=gb-la-w06000015Questions
What is the population in Cardiff?
Population in Cardiff was 381,516 in 2025, according to the Office for National Statistics (United Kingdom). That is down 0.1% from 2024.
Where does this figure come from?
Office for National Statistics (United Kingdom). Population estimates, local authority based by single year of age: all ages, both sexes, mid-year (ONS, Nomis NM_2002_1). Retrieved by Invokely on 2026-10-11.
What was the highest population in Cardiff?
382,028 in 2024, the highest value since 2011 in this series.