Llechau · Photo: FruitMonkey · CC BY-SA 4.0A higher share of households with dependent children than 95% of UK towns, at 37%
26% of households are one person living alone (Wales’s towns: 32%). Llanharry had 3,747 residents and 1,536 households at the 2021 Census, with a median age of 37.7 (younger than 90% of UK towns). The share of households in flats stands at 6.1%. On married adults and civil partners, Llanharry sits lower than 71% of UK towns: 45%.
What the Census says about Llanharry’s people
A town of families
37% of Llanharry’s 1,536 households had dependent children in 2021, more than in 95% of UK towns and the highest share in Mid Glamorgan. 22% of residents are under 15. Households ↓
More with no religion than most
58% of residents answered “no religion” in 2021 and 35% Christian, against 47% and 43% across Wales’s towns. Ethnicity & religion ↓
Younger than most towns
Half of Llanharry’s residents are under 37.7 and half over, against 44.4 in the typical UK town. 9.2% are 15 to 24 and 15% are 65 or over. Ages ↓
Written from the data on this page: ONS Census 2021 (output areas summed to the 2022 built-up area).
Younger than 90% of UK towns: half of Llanharry is under 37.7
Share of residents in each five-year age band, Census 2021.
Against a figure of 21% across Wales’s towns, the share of residents aged 65 and over in Llanharry comes in at 15%. The largest age band is 35–39: 8% of residents, 1.3 times the share across Wales’s towns.
Median age of UK towns of 2,500+
■ Llanharry, 37.7. The typical town is 44.4.
Broad ages · share of residents
Women and men · all residents
51% women, 49% men
About 96 men for every 100 women. Across Wales, 51% of residents are women.
Residents who moved in within the year: 6.2%, a lower share than 95% of UK towns
What adults did at the 2021 Census (the ONS’s NS-SEC classes), and where residents lived a year earlier.
Adults by occupation class · residents 16 and over
Address a year before the Census
Residents who lived somewhere else a year earlier. The bar runs to 25%.
Where 8% of adults are full-time students across Wales’s towns, Llanharry has 5.2%. On average, nearly one in ten residents lived at another address a year earlier across Wales’s towns.
The Census was taken on 21 March 2021, in term time, so students were counted at their term addresses.
Larger households than 83% of UK towns: 2.4 people on average
Household make-up at the 2021 Census. Each square is 1% of households.
Against Mid Glamorgan’s towns and Wales’s towns
People per household
Wales’s towns.
By its share of shared households of unrelated adults (2%), Llanharry is below 72% of UK towns.
Below 62% of UK towns: 13% of households have no car or van
Accommodation type and cars or vans per household, Census 2021. Owning and renting are on Cost of living.
Type of home
Cars or vans · share of households
Across Wales’s towns, 24% of households live in a detached house; in Llanharry, 25%. 23% of households live in a terraced house, a higher share than in 60% of UK towns. Measured more widely, just over a fifth of households have no car or van across Wales’s towns.
3.1% born outside the UK, fewer than in 90% of UK towns
Country of birth, year of arrival and main language, Census 2021.
Born outside the UK, by region · share of all residents; the bar runs to 10%
When those born abroad arrived
Main language · residents aged 3 and over
Of residents born abroad, 19% arrived in 2017 or later, against 23% across Wales’s towns. Compared with other places, residents whose main language is English are common here: 99%, more than in 78% of UK towns. The comparison figure for residents born outside the UK is 7.4% across Wales’s towns. Among residents born abroad, the largest groups were born in EU countries (1.3%) and in the Middle East and Asia (0.7%).
15% of residents speak Welsh in Llanharry
Welsh language skills, residents aged 3 and over, Census 2021.
Welsh language skills · residents aged 3 and over
Against 16% across Welsh towns, 15% of residents aged 3 and over can speak Welsh here (536 people): more than in 66% of Welsh towns. Pontyclun leads Mid Glamorgan with 20%.
A higher share of residents with no religion than 99% of UK towns, at 58%
How residents described themselves at the 2021 Census. Lines join the lowest and highest of the three figures.
Ethnic groups other than White British · all residents
White British, not charted: 95% of Llanharry · Mid Glamorgan’s towns 95% · Wales’s towns 90%.
Religion · all residents
Of the other groups, the largest are Mixed or multiple (1.9%), Other White (1.4%) and Indian (0.4%). On residents who describe themselves as Christian, Llanharry sits lower than 97% of UK towns: 35%. Elsewhere, 47% of residents said they have no religion across Wales’s towns. The figure for residents who describe themselves as White British is 95% in Llanharry and 90% across Wales’s towns.
In Llanharry, 37% of adults have never married or formed a civil partnership, more than in 75% of UK towns
Legal partnership status (residents 16 and over) and unpaid care (residents 5 and over), Census 2021.
Partnership status · residents 16 and over
Unpaid care given · share of residents 5 and over
At 10%, the share of unpaid carers is in line with the figure across Wales’s towns. The benchmark for adults who have never married across Wales’s towns: 38%. 129 residents care, unpaid, for at least 50 hours a week.
Degree level: the highest qualification of 32% of adults
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
Degree-level qualifications are held by 32% of Llanharry’s adults, against 31% across Wales’s towns; 23% have no qualification (20%).
35th youngest of 530 UK towns of 3,000 to 5,000 people
Median age, Census 2021. Hover a dot for its students and residents born abroad; click for its page.
The youngest is Bailrigg (18.9) and the oldest Milford on Sea (64.6). Nearest to Llanharry in age: Chartham (37.6), Harwell (37.7), Aberbargoed (37.8) and Tangmere (37.9).
No nearby town is as young as Llanharry
Nearby built-up areas coloured by median age, Census 2021. Tap a town for its page.
| Town | People | Away | Median age | 65+ | Homes with children |
|---|---|---|---|---|---|
| Llanharry | 3,747 | — | 37.7 | 15% | 37% |
| Pontyclun | 5,801 | 1.9 mi | 43.3 | 18% | 35% |
| Llanharan and Brynna | 8,106 | 2 mi | 38 | 15% | 36% |
| Talbot Green | 3,291 | 2.2 mi | 45.9 | 24% | 27% |
| Llantrisant | 4,196 | 2.8 mi | 48.3 | 24% | 25% |
| Pencoed | 9,119 | 3.5 mi | 45.5 | 23% | 28% |
| Cowbridge | 3,649 | 3.7 mi | 54.8 | 37% | 22% |
| Beddau | 7,356 | 4.2 mi | 40 | 18% | 30% |
Health, work and homes have their own pages
What this data can and can’t tell you
- The Census was taken in a lockdown, in term time. 21 March 2021 fell in term time, and students were asked to give their term-time address, so most were counted where they study. Some may have been living with family that day.
- “Mid Glamorgan’s towns” and “Wales’s towns” mean their built-up areas. Census comparisons pool every built-up area in Mid Glamorgan (or Wales), summed the same way as Llanharry’s figures, so households in open countryside are left out.
- Small counts are blurred. The ONS adds small random changes to Census counts to protect privacy, so the same total differs a little between tables, and the shares of a small town can move by a point or two.
Questions about Llanharry’s residents
What is the population of Llanharry?
The 2021 Census counted 3,747 people in Llanharry’s built-up area.
What is the average age in Llanharry?
The median age was 37.7 at the 2021 Census, younger than 90% of UK towns. 9.2% of residents were 15 to 24 and 15% were 65 or over.
How diverse is Llanharry?
95% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 95% across Mid Glamorgan’s towns. 3.1% were born outside the UK.
What religion are people in Llanharry?
58% said they had no religion and 35% that they were Christian at the 2021 Census; 0.3% were Muslim and 5.3% didn’t answer.
Is Llanharry good for families?
37% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Llanharry’s schools page.
How many people speak Welsh in Llanharry?
536 residents aged 3 and over, 15%, said they can speak Welsh at the 2021 Census, against 16% across Welsh towns.
Sources: ONS Census 2021, output areas summed to the ONS 2022 built-up area (TS002, TS003, TS004, TS007A, TS008, TS015, TS017, TS019, TS021, TS029, TS030, TS039, TS044, TS045, TS062, TS067, TS032). All under the Open Government Licence v3.0.
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.