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How the population has changed in Cardiff

Demographic trends in Cardiff and other local authorities within the UK from 2002 to 2020
Last updated:

Cardiff's demographics, 2020:

Total population 369,202 people

The total population in Cardiff rose compared with 2019.

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Population density 2,620 people per sq km

The population density in Cardiff is higher than the United Kingdom as a whole.

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Median age 34 years

The average age in Cardiff is younger than the United Kingdom as a whole.

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Warning:

This is a demo article. The numbers are based on official ONS mid-year population estimates, but may not be presented accurately.

Total population in Cardiff

In 2020, Cardiff was the largest local authority in Wales, with a total population of 369,202. An increase compared with 2019.

Population of local authorities in Wales

Number of usual residents, 2002-2020
Source: Office for National Statistics

Population density in Cardiff

In 2020, the population density in Cardiff was 2,620 people per square kilometre, which was more than Wales (153), and more than the United Kingdom as a whole (276).

Densest local authorities in Wales

Population density in people per sq km, 2020
Source: Office for National Statistics

Median age in Cardiff

In 2020, the median age in Cardiff was 34 years, which was younger than Wales (42 years), and younger than the United Kingdom as a whole (41 years).

Oldest local authorities in Wales

Median age in years, 2020
Source: Office for National Statistics

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