Photo: Roger Cornfoot · CC BY-SA 2.076% of households live in a terraced house, more than in 99% of UK towns
Residents with no religion make up 58%, against 47% across Wales’s towns. Across Ynysddu, 5.8% of households live in a detached house. Compared with other places, residents aged 15 to 24 are scarce here: 7.8%, fewer than in 94% of UK towns. The village counted 987 residents and 398 households at the 2021 Census.
Half of Ynysddu is under 42.6, younger than 65% of UK towns
Share of residents in each five-year age band, Census 2021.
Across Wales’s towns, 21% of residents are 65 or over; in Ynysddu, 20%. The biggest five-year age group is 55–59, with 8% of residents.
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.
Below 78% of UK towns: 4.2% of adults are full-time students
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%.
Across Wales’s towns, 29% of adults are in managerial and professional jobs and 27% in routine or semi-routine work; Ynysddu has 25% and 30%. The wider picture: 8% of adults are full-time students across Wales’s towns. The census found that nearly one in ten residents lived at another address a year earlier in the village.
A larger share of households with dependent children than 81% of UK towns: 31%
Household make-up at the 2021 Census. Each square is 1% of households.
Against Gwent’s towns and Wales’s towns
People per household
Wales’s towns.
Shared households of unrelated adults: 1%, below 99% of UK towns. Few places have so few one-person households: 29% here, fewer than in 61% of UK towns. The comparison figure for households with dependent children is 27% across Wales’s towns. The average household has 2.4 people.
Below 79% of UK towns: 5.8% of households live in a flat or apartment
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
In Ynysddu, nearly a fifth of households have no car or van, beside 21% across Wales’s towns. The usual figure: 14% of households live in a flat or apartment across Wales’s towns.
Fewer residents born outside the UK than 97% of UK towns: 2.3%
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
With residents whose main language is English at 99%, Ynysddu is ahead of 98% of UK towns on that count. Across Wales’s towns, the share of residents born outside the UK is 7.4%. The largest groups were born in EU countries (1.2%) and in the Americas, Oceania and elsewhere (0.5%).
A Welsh-speaking share of 7.8% in Ynysddu
Welsh language skills, residents aged 3 and over, Census 2021.
Welsh language skills · residents aged 3 and over
Welsh speakers number 74, or 7.8% of residents aged 3 and over, against 16% across Welsh towns: fewer than in 91% of them. Top of Gwent: Abertridwr and Senghenydd, at 14%.
Ynysddu sits below 97% of UK towns for residents who describe themselves as Christian (35%)
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 Ynysddu · Gwent’s towns 91% · Wales’s towns 90%.
Religion · all residents
Beyond White British, the biggest groups are Other White (1.8%), Mixed or multiple (1.3%) and Chinese (0.3%). Residents who describe themselves as White British are more common here than in 91% of UK towns. Set beside that, 43% of residents describe themselves as Christian across Wales’s towns.
45% of adults are married or in a civil partnership, fewer than in 71% 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
Some 30 people give 50 hours or more of unpaid care a week. Unpaid carers are more common here than in 82% of UK towns. Against that, 43% of adults are married or in a civil partnership across Wales’s towns. Across Wales’s towns, 38% of adults have never married or formed a civil partnership; in Ynysddu, 37%.
Qualified to degree level: 24% of adults
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
Across Wales’s towns, 31% of adults have a degree-level qualification; in Ynysddu, 24%, and 25% have none, against 20%.
Around Ynysddu, 4 of 7 towns have a higher median age
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 |
|---|---|---|---|---|---|
| Ynysddu | 987 | — | 42.6 | 20% | 31% |
| Cwmfelinfach | 1,353 | 0.7 mi | 40.4 | 17% | 27% |
| Maesycwmmer | 2,095 | 2 mi | 46.1 | 24% | 25% |
| Pontllanfraith | 9,363 | 2 mi | 43.5 | 22% | 27% |
| Llanbradach | 3,766 | 2.2 mi | 44.1 | 22% | 25% |
| Bedwas | 6,463 | 2.3 mi | 44.4 | 22% | 28% |
| Trethomas | 1,713 | 2.4 mi | 33.8 | 14% | 38% |
| Ystrad Mynach | 11,856 | 2.6 mi | 39.5 | 16% | 32% |
Health, work and homes have their own pages
What this data can and can’t tell you
- “Gwent’s towns” and “Wales’s towns” mean their built-up areas. Census comparisons pool every built-up area in Gwent (or Wales), summed the same way as Ynysddu’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 Ynysddu’s residents
What is the population of Ynysddu?
The 2021 Census counted 987 people in Ynysddu’s built-up area.
What is the average age in Ynysddu?
The median age was 42.6 at the 2021 Census. 7.8% of residents were 15 to 24 and 20% were 65 or over.
How diverse is Ynysddu?
96% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 91% across Gwent’s towns. 2.3% were born outside the UK.
What religion are people in Ynysddu?
58% said they had no religion and 35% that they were Christian at the 2021 Census; 0% were Muslim and 5.3% didn’t answer.
Is Ynysddu good for families?
31% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Ynysddu’s schools page.
How many people speak Welsh in Ynysddu?
74 residents aged 3 and over, 7.8%, 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.