Photo: Llywelyn2000 · CC BY-SA 4.0In Trawsfynydd, 100% of residents describe themselves as White British, more than in 99% of UK towns
0.8% of households are unrelated adults sharing a home (Wales’s towns: 3.1%). There were 133 households in Trawsfynydd at the 2021 Census, home to 317 residents. In Trawsfynydd, just over two in five adults have never married or formed a civil partnership. With a median age of 38.4, Trawsfynydd is younger than 88% of UK towns.
13% of residents are aged 15 to 24, more than in 95% of UK towns
Share of residents in each five-year age band, Census 2021.
Set against 21% across Wales’s towns, 20% of residents are 65 or over in Trawsfynydd. As a yardstick, 12% of residents are aged 15 to 24 across Wales’s towns.
Broad ages · share of residents
Women and men · all residents
49% women, 51% men
About an even split. Across Wales, 51% of residents are women.
In Trawsfynydd, 10% of adults are full-time students, more than in 96% 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%.
9.1% of residents lived at another address a year earlier across Wales’s towns, against 11% in Trawsfynydd. As a reference point, 8% of adults are full-time students across Wales’s towns.
The Census was taken on 21 March 2021, in term time, so students were counted at their term addresses.
31% of households have dependent children, more than in 79% 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.
At 2.4 people, the average household compares with 2.3 across Wales’s towns. Across Trawsfynydd, just over a third of households are one person living alone. On average, 27% of households have dependent children across Wales’s towns.
More households in terraced houses than 93% of UK towns: 39%
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
Households in flats are rarer here than in 99% of UK towns. By way of comparison, 29% of households live in a terraced house across Wales’s towns. Across Trawsfynydd, 23% of households have no car or van. In Trawsfynydd, 16% of households live in a detached house, beside 24% across Wales’s towns.
A smaller share of residents born outside the UK than 99% of UK towns: 0.3%
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
Compared with 96% across Wales’s towns, 99% of residents have English as their main language here. Residents born outside the UK: 7.4% across Wales’s towns, for comparison.
81% of Trawsfynydd’s residents say they can speak Welsh
Welsh language skills, residents aged 3 and over, Census 2021.
Welsh language skills · residents aged 3 and over
Asked in 2021, 246 residents aged 3 and over, 81%, said they can speak Welsh; across Welsh towns, 16%: more than in 99% of Welsh towns. No town in Gwynedd beats Caernarfon (82%).
Above 87% of UK towns: 47% of residents said they have no religion
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: 100% of Trawsfynydd · Gwynedd’s towns 93% · Wales’s towns 90%.
Religion · all residents
Across Trawsfynydd, nearly half of residents describe themselves as Christian.
38% of adults are married or in a civil partnership, below 94% 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
Unpaid carers make up 8.7% of residents, against 10% across Wales’s towns. Across Wales’s towns, 43% of adults are married or in a civil partnership.
Degree-level qualifications: 21% of adults
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
Degree-level qualifications are held by 21% of Trawsfynydd’s adults, against 31% across Wales’s towns; 26% have no qualification (20%). A levels are as far as 13% have gone so far, many of them students midway to a degree.
No nearby town is as young as Trawsfynydd
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 |
|---|---|---|---|---|---|
| Trawsfynydd | 317 | — | 38.4 | 20% | 31% |
| Blaenau Ffestiniog | 3,449 | 6.4 mi | 43.4 | 20% | 26% |
| Penrhyndeudraeth | 1,463 | 6.5 mi | 45.6 | 23% | 25% |
| Harlech | 1,261 | 8.2 mi | 56 | 34% | 15% |
| Porthmadog | 2,579 | 9 mi | 48.3 | 28% | 22% |
| Dolgellau | 2,599 | 11 mi | 50.3 | 26% | 21% |
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.
- “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 Trawsfynydd’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 Trawsfynydd’s residents
What is the population of Trawsfynydd?
The 2021 Census counted 317 people in Trawsfynydd’s built-up area.
What is the average age in Trawsfynydd?
The median age was 38.4 at the 2021 Census. 13% of residents were 15 to 24 and 20% were 65 or over.
How diverse is Trawsfynydd?
100% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 93% across Gwynedd’s towns. 0.3% were born outside the UK.
What religion are people in Trawsfynydd?
47% said they had no religion and 49% that they were Christian at the 2021 Census; 0% were Muslim and 3.5% didn’t answer.
Is Trawsfynydd good for families?
31% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Trawsfynydd’s schools page.
How many people speak Welsh in Trawsfynydd?
246 residents aged 3 and over, 81%, 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.