Photo: David Purchase · CC BY-SA 2.0Bryn Du is older than 94% of UK towns: a median age of 53.5
Set against 24% across Wales’s towns, 55% of households live in a detached house in Bryn Du. The village’s 333 households held 710 residents at the 2021 Census. Here, just over a fifth of households have dependent children. Households in flats are rarer here than in 97% of UK towns.
More residents aged 65 and over than 89% of UK towns: 29%
Share of residents in each five-year age band, Census 2021.
More residents are 50–54 than any other five-year age: 9.7% of residents, 1.4 times the share across Wales’s towns. On the census count, 8.6% of residents are aged 15 to 24. For comparison, 21% of residents are 65 or over across Wales’s towns.
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.
Bryn Du sits below 85% of UK towns for full-time students (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%.
Across Wales’s towns, 29% of adults are in managerial and professional jobs and 27% in routine work; in Bryn Du, 30% and 25%. 6.8% of residents lived at another address a year earlier. For comparison, 8% of adults are full-time students across Wales’s towns.
Households here average 2.2 people, below 81% of UK towns
Household make-up at the 2021 Census. Each square is 1% of households.
Against Gwynedd’s towns and Wales’s towns
People per household
Wales’s towns.
With one-person households at 33%, Bryn Du is ahead of 76% of UK towns on that count. The census found that 2.1% of households are unrelated adults sharing a home locally.
Only 8.2% of households have no car or van in Bryn Du
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
By its share of households in terraced houses (24%), Bryn Du is above 64% of UK towns. Every 12th household or so has no car or van.
Only 2.5% of residents were born outside the UK in Bryn Du
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
Across Wales’s towns, 96% of residents have English as their main language; in Bryn Du, 99%. The benchmark for residents born outside the UK across Wales’s towns: 7.4%. The two biggest birthplaces abroad are in EU countries (1.6%) and in Africa (0.6%).
Welsh, spoken by 53% of Bryn Du’s residents
Welsh language skills, residents aged 3 and over, Census 2021.
Welsh language skills · residents aged 3 and over
Some 372 people here aged 3 and over said in 2021 that they can speak Welsh, 53% of the total, against 16% across Welsh towns: more than in 93% of them. Within Gwynedd, Caernarfon has the largest share, 82%.
Bryn Du sits above 96% of UK towns for residents who describe themselves as White British (97%)
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: 97% of Bryn Du · Gwynedd’s towns 93% · Wales’s towns 90%.
Religion · all residents
Residents who describe themselves as Christian make up 55%, against 43% across Wales’s towns. Set beside that, 90% of residents describe themselves as White British across Wales’s towns. 38% of residents said they have no religion.
Fewer adults who have never married than 85% of UK towns: 27%
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
Unpaid carers make up 12%, against 10% across Wales’s towns. Few places have as many married adults and civil partners: 52% here, more than in 73% of UK towns. Adults who have never married make up 38% across Wales’s towns. Some 21 people give 50 hours or more of unpaid care a week.
The share of adults with a degree-level qualification: 33%
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
Degree-level qualifications are held by 33% of Bryn Du’s adults, against 31% across Wales’s towns; 19% have no qualification (20%).
Every nearby town is younger than Bryn Du
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 |
|---|---|---|---|---|---|
| Bryn Du | 710 | — | 53.5 | 29% | 21% |
| Bodedern | 1,193 | 4.6 mi | 41.2 | 20% | 29% |
| Valley | 2,003 | 5.3 mi | 51.2 | 29% | 23% |
| Llangefni | 5,264 | 7.5 mi | 39.5 | 20% | 31% |
| Llanerchymedd | 1,155 | 8.4 mi | 44.3 | 21% | 30% |
| Holyhead | 11,753 | 8.4 mi | 39.4 | 18% | 29% |
| Gaerwen | 1,277 | 8.6 mi | 39.8 | 19% | 30% |
| Caernarfon | 9,831 | 10.8 mi | 39.6 | 19% | 28% |
Health, work and homes have their own pages
What this data can and can’t tell you
- “Gwynedd’s towns” and “Wales’s towns” mean their built-up areas. Census comparisons pool every built-up area in Gwynedd (or Wales), summed the same way as Bryn Du’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 Bryn Du’s residents
What is the population of Bryn Du?
The 2021 Census counted 710 people in Bryn Du’s built-up area.
What is the average age in Bryn Du?
The median age was 53.5 at the 2021 Census. 8.6% of residents were 15 to 24 and 29% were 65 or over.
How diverse is Bryn Du?
97% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 93% across Gwynedd’s towns. 2.5% were born outside the UK.
What religion are people in Bryn Du?
38% said they had no religion and 55% that they were Christian at the 2021 Census; 0.6% were Muslim and 5.8% didn’t answer.
Is Bryn Du good for families?
21% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Bryn Du’s schools page.
How many people speak Welsh in Bryn Du?
372 residents aged 3 and over, 53%, 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.