Photo: Jaggery · CC BY-SA 2.019% of households have dependent children, below 96% of UK towns
Set against 29% across Wales’s towns, 64% of households live in a terraced house in Deri. Unpaid carers account for 14%. The median age locally is 50.5, higher than in 87% of UK towns. The 2021 Census counted 583 residents in 277 households.
Deri ranks above 61% of UK towns on residents aged 65 and over: 23%
Share of residents in each five-year age band, Census 2021.
Set against 12% across Wales’s towns, 10% of residents are aged 15 to 24 in Deri. Measured more widely, 21% of residents are 65 or over across Wales’s towns.
Broad ages · share of residents
Women and men · all residents
52% women, 48% men
About 93 men for every 100 women. Across Wales, 51% of residents are women.
Deri ranks below 96% of UK towns on full-time students: 3.4%
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 nearly one in ten residents lived at another address a year earlier across Wales’s towns, Deri has 6%. As a yardstick, 8% of adults are full-time students across Wales’s towns.
38% of households are one person living alone, a share 95% of UK towns don’t reach
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.
There is little gap on shared households of unrelated adults: 2.9%, about the same as across Wales’s towns. Set beside that, nearly a third of households are one person living alone across Wales’s towns. The average household has 2.2 people.
Deri sits below 91% of UK towns for households in detached houses (12%)
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
Set against 21% across Wales’s towns, nearly a quarter of households have no car or van in Deri. As a reference point, nearly a quarter of households live in a detached house across Wales’s towns. In Deri, 5.9% of households live in a flat or apartment.
Below 96% of UK towns: 2.6% of residents were born outside the UK
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
The figure for residents whose main language is English is 99% in Deri and 96% across Wales’s towns. The wider picture: 7.4% of residents were born outside the UK across Wales’s towns. Most residents from abroad were born in EU countries (1.2%) or in the Middle East and Asia (0.9%).
Deri’s Welsh speakers make up 9.8% of residents
Welsh language skills, residents aged 3 and over, Census 2021.
Welsh language skills · residents aged 3 and over
Across Welsh towns, 16% of residents can speak Welsh; here 56 people, 9.8% of those aged 3 and over, said they can: fewer than in 72% of Welsh towns. In Gwent, Abertridwr and Senghenydd has the highest share (14%).
96% of residents describe themselves as White British, more than in 92% 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 Deri · Gwent’s towns 91% · Wales’s towns 90%.
Religion · all residents
Christians make up 45% of residents, against 43% across Wales’s towns. Residents who describe themselves as White British make up 90% across Wales’s towns. The share of residents with no religion stands at 48%.
Only 44% of adults are married or in a civil partnership in Deri
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
Adults who have never married: 34%, above 57% of UK towns. As a reference point, 43% of adults are married or in a civil partnership across Wales’s towns. The number giving 50 or more hours of unpaid care a week is 29.
24% of adults are qualified to degree level
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
Against 31% across Wales’s towns, 24% of adults here have a degree-level qualification, while 23% hold no qualification (20%).
Every neighbour of Deri has a younger population
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 |
|---|---|---|---|---|---|
| Deri | 583 | — | 50.5 | 23% | 19% |
| New Tredegar | 3,280 | 1.3 mi | 40.8 | 19% | 28% |
| Bargod | 8,034 | 1.7 mi | 41.4 | 21% | 28% |
| Aberbargoed | 4,412 | 1.9 mi | 37.8 | 16% | 33% |
| Bedlinog | 1,098 | 2.3 mi | 46.3 | 21% | 24% |
| Markham | 1,443 | 2.3 mi | 37.2 | 18% | 35% |
| Abertysswg | 1,424 | 2.5 mi | 41.2 | 19% | 30% |
| Pen-pedair-heol | 3,787 | 2.8 mi | 46.9 | 23% | 25% |
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 Deri’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 Deri’s residents
What is the population of Deri?
The 2021 Census counted 583 people in Deri’s built-up area.
What is the average age in Deri?
The median age was 50.5 at the 2021 Census. 10% of residents were 15 to 24 and 23% were 65 or over.
How diverse is Deri?
96% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 91% across Gwent’s towns. 2.6% were born outside the UK.
What religion are people in Deri?
48% said they had no religion and 45% that they were Christian at the 2021 Census; 0.2% were Muslim and 6.2% didn’t answer.
Is Deri good for families?
19% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Deri’s schools page.
How many people speak Welsh in Deri?
56 residents aged 3 and over, 9.8%, 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.