Photo: John Lord · CC BY-SA 2.0More households in detached houses than 99% of UK towns: 75%
Across Wales’s towns, 38% of adults have never married or formed a civil partnership; in Efail Isaf, 24%. The median age locally is 50.6, higher than in 88% of UK towns. Census day 2021: 588 residents and 238 households locally. Households without a car or van account for 5.1%.
25% of Efail Isaf is 65 or over, a higher share than 73% of UK towns
Share of residents in each five-year age band, Census 2021.
No age band is larger than 55–59: nearly one in ten residents, 1.3 times the share across Wales’s towns. Measured more widely, 21% of residents are 65 or over across Wales’s towns. For Efail Isaf, the census puts residents aged 15 to 24 at 11%.
Broad ages · share of residents
Women and men · all residents
51% women, 49% men
About 95 men for every 100 women. Across Wales, 51% of residents are women.
Residents who moved in within the year make up 4.3% in Efail Isaf, less than in 99% 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%.
In Efail Isaf, 53% of adults work in managerial and professional jobs and 10% in routine and semi-routine work, against 29% and 27% across Wales’s towns. More full-time students than in 62% of UK towns: 5.1%. Elsewhere, 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.
In Efail Isaf, 19% of households are one person living alone, fewer than in 98% of UK towns
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.
Across Wales’s towns, the share of shared households of unrelated adults is 3.1%; Efail Isaf has 2.1%. On average, nearly a third of households are one person living alone across Wales’s towns. The average household has 2.5 people. Lower than in 62% of UK towns: 26% of households have dependent children.
4.2% of households live in a terraced house, fewer than in 98% of UK towns
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
The share of households in flats is 2.1%, against 14% across Wales’s towns. By way of comparison, 29% of households live in a terraced house across Wales’s towns.
Efail Isaf sits below 65% of UK towns for residents born outside the UK (4.9%)
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%
Main language · residents aged 3 and over
Among residents born abroad, the largest groups were born in the Middle East and Asia (2.7%) and in EU countries (1%). The comparison figure for residents born outside the UK is 7.4% across Wales’s towns. Higher than in 62% of UK towns: 98% of residents have English as their main language.
A Welsh-speaking share of 28% in Efail Isaf
Welsh language skills, residents aged 3 and over, Census 2021.
Welsh language skills · residents aged 3 and over
Asked in 2021, 159 residents aged 3 and over, 28%, said they can speak Welsh; across Welsh towns, 16%: more than in 81% of Welsh towns. Within Mid Glamorgan, Pontyclun has the largest share, 20%.
In Efail Isaf, 96% of residents describe themselves as White British, more than in 85% of UK towns
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: 96% of Efail Isaf · Mid Glamorgan’s towns 95% · Wales’s towns 90%.
Religion · all residents
Across Wales’s towns, 43% of residents describe themselves as Christian; in Efail Isaf, 50%. On average, nine in ten residents describe themselves as White British across Wales’s towns. 1.9% of residents are Muslim. Residents with no religion are more common here than in 61% of UK towns.
63% of adults are married or in a civil partnership, more than in 99% 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
The number giving 50 or more hours of unpaid care a week is 23. The benchmark for married adults and civil partners across Wales’s towns: 43%. At 8.5%, the share of unpaid carers is lower than in 72% of UK towns.
Adults with a degree-level qualification: 53%
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
Degree-level qualifications are held by 53% of Efail Isaf’s adults, against 31% across Wales’s towns; 14% have no qualification (20%).
Efail Isaf is older than every town around it
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 |
|---|---|---|---|---|---|
| Efail Isaf | 588 | — | 50.6 | 25% | 26% |
| Church Village | 14,162 | 0.7 mi | 42.5 | 21% | 32% |
| Taff's Well | 3,553 | 1.9 mi | 44.7 | 20% | 25% |
| Beddau | 7,356 | 1.9 mi | 40 | 18% | 30% |
| Pentyrch | 2,374 | 2 mi | 49 | 28% | 28% |
| Creigiau | 2,304 | 2.5 mi | 49.7 | 27% | 27% |
| Pontypridd | 31,895 | 3 mi | 37.3 | 17% | 26% |
| Llantrisant | 4,196 | 3.1 mi | 48.3 | 24% | 25% |
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 Efail Isaf’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 Efail Isaf’s residents
What is the population of Efail Isaf?
The 2021 Census counted 588 people in Efail Isaf’s built-up area.
What is the average age in Efail Isaf?
The median age was 50.6 at the 2021 Census. 11% of residents were 15 to 24 and 25% were 65 or over.
How diverse is Efail Isaf?
96% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 95% across Mid Glamorgan’s towns. 4.9% were born outside the UK.
What religion are people in Efail Isaf?
43% said they had no religion and 50% that they were Christian at the 2021 Census; 1.9% were Muslim and 3.9% didn’t answer.
Is Efail Isaf good for families?
26% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Efail Isaf’s schools page.
How many people speak Welsh in Efail Isaf?
159 residents aged 3 and over, 28%, 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.