Photo: David Dixon · CC BY-SA 2.039% of households live in a terraced house, more than in 93% of UK towns
Compared with 38% across Wales’s towns, 46% of adults have never married or formed a civil partnership here. The 2021 Census counted 655 residents in 282 households. On the census count, 32% of households have dependent children. 3.9% of households live in a flat or apartment, a lower share than in 89% of UK towns.
Younger than 63% of UK towns: half of Brynsiencyn is under 42.8
Share of residents in each five-year age band, Census 2021.
Little separates the share of residents aged 15 to 24 here, 12%, from the figure across Wales’s towns. The biggest five-year age group is 55–59, with 7.4% of residents. Fewer residents aged 65 and over than in 52% of UK towns: 22%.
Broad ages · share of residents
Women and men · all residents
47% women, 53% men
About 111 men for every 100 women. Across Wales, 51% of residents are women.
Brynsiencyn sits below 94% of UK towns for residents who moved in within the year (6.4%)
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%.
At 8%, the share of full-time students is in line with the figure across Wales’s towns. The comparison figure for residents who moved in within the year is 9.1% across Wales’s towns.
The Census was taken on 21 March 2021, in term time, so students were counted at their term addresses.
Shared households of unrelated adults: 1.8%, a lower share than 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.
At 2.3 people, the average household compares with 2.3 across Wales’s towns. Shared households of unrelated adults make up 3.1% across Wales’s towns. The share of one-person households stands at 31%.
32% of households live in a detached house, more than in 58% 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
Households without a car or van make up 14%, against 21% across Wales’s towns. At the same time, 3.9% of households live in a flat, less than in 89% of UK towns; 32% in a detached house, against 24% across Wales’s towns.
Brynsiencyn ranks below 86% of UK towns on residents born outside the UK: 3.4%
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 largest groups were born in EU countries (1.8%) and in Africa (0.6%). Residents born outside the UK make up 7.4% across Wales’s towns. On residents whose main language is English, Brynsiencyn sits higher than 89% of UK towns: 99%.
66% of residents speak Welsh in Brynsiencyn
Welsh language skills, residents aged 3 and over, Census 2021.
Welsh language skills · residents aged 3 and over
Welsh speakers number 420, or 66% of residents aged 3 and over, against 16% across Welsh towns: more than in 96% of them. In Gwynedd, Caernarfon has the highest share (82%).
96% of residents describe themselves as White British, a share 86% of UK towns don’t reach
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 Brynsiencyn · Gwynedd’s towns 93% · Wales’s towns 90%.
Religion · all residents
On religion, 48% answered “no religion” and 45% Christian, against 47% and 43% across Wales’s towns. Of the other groups, the largest are Other White (1.8%), Mixed or multiple (1.5%) and Indian (0.2%). Residents who describe themselves as Christian are rarer here than in nearly four fifths of UK towns. Set beside that, nine in ten residents describe themselves as White British across Wales’s towns.
Brynsiencyn sits below 95% of UK towns for married adults and civil partners (38%)
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
24 residents care, unpaid, for at least 50 hours a week. Across Wales’s towns, the share of married adults and civil partners is 43%. At 10%, the share of unpaid carers is higher than in just over two thirds of UK towns.
A degree-level qualification for 29% of adults
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
29% of Brynsiencyn’s adults have a degree-level qualification, against 31% across Wales’s towns; 22% have none (20%). A levels top the qualifications of 14%, many of them students on the way to a degree.
Of the 7 towns nearest Brynsiencyn, 4 are older
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 |
|---|---|---|---|---|---|
| Brynsiencyn | 655 | — | 42.8 | 22% | 32% |
| Y Felinheli | 2,333 | 2.5 mi | 42.9 | 21% | 25% |
| Caernarfon | 9,831 | 2.7 mi | 39.6 | 19% | 28% |
| Bethel | 1,091 | 2.8 mi | 44.7 | 24% | 32% |
| Gaerwen | 1,277 | 3 mi | 39.8 | 19% | 30% |
| Llanrug | 1,537 | 4 mi | 41.2 | 22% | 34% |
| Llanfair Pwllgwyngyll | 2,905 | 4.3 mi | 52 | 33% | 22% |
| Menai Bridge | 3,045 | 5.5 mi | 47.3 | 24% | 20% |
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 Brynsiencyn’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 Brynsiencyn’s residents
What is the population of Brynsiencyn?
The 2021 Census counted 655 people in Brynsiencyn’s built-up area.
What is the average age in Brynsiencyn?
The median age was 42.8 at the 2021 Census. 12% of residents were 15 to 24 and 22% were 65 or over.
How diverse is Brynsiencyn?
96% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 93% across Gwynedd’s towns. 3.4% were born outside the UK.
What religion are people in Brynsiencyn?
48% said they had no religion and 45% that they were Christian at the 2021 Census; 0.2% were Muslim and 6.6% didn’t answer.
Is Brynsiencyn good for families?
32% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Brynsiencyn’s schools page.
How many people speak Welsh in Brynsiencyn?
420 residents aged 3 and over, 66%, 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.