Photo: Gareth James · CC BY-SA 2.0A Welsh-speaking village: 70% of Llanberis’s residents speak Welsh
Here 35% of households are one person living alone, where the figure across Wales’s towns is 32%. Llanberis is home to 1,838 residents in 806 households, by the 2021 Census. For Llanberis, the census puts households in terraced houses at 49%. Married adults and civil partners are rarer here than in 97% of UK towns.
What the Census says about Llanberis’s people
A Welsh-speaking village
1,257 residents, 70% of those aged 3 and over, said they can speak Welsh in 2021, more than in 96% of Welsh towns. Welsh language ↓
Written from the data on this page: ONS Census 2021 (output areas summed to the 2022 built-up area).
10% of residents are 15 to 24, more than in 71% of UK towns
Share of residents in each five-year age band, Census 2021.
The share of residents aged 65 and over trails 63% of UK towns: 20%. At the same time, half of Llanberis’s residents are over 44.5, older than in half of UK towns. By way of comparison, 12% of residents are aged 15 to 24 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.
A larger share of full-time students than 85% of UK towns: 6.1%
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%.
Residents who moved in within the year make up 7.8%, against 9.1% across Wales’s towns. The wider picture: 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.
Smaller households than 76% of UK towns: 2.2 people on average
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.
There is little gap on shared households of unrelated adults: 3.9%, about the same as across Wales’s towns. Households with dependent children account for 25%.
Only 20% of households in Llanberis live in a detached house
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
The share of households without a car or van is 14%, against 21% across Wales’s towns. On the census count, just over one in ten households live in a flat or apartment. For comparison, 24% of households live in a detached house across Wales’s towns.
Fewer residents born outside the UK than 85% of UK towns: 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
Most residents from abroad were born in EU countries (1.3%) or in the Middle East and Asia (0.9%). More residents whose main language is English than in 93% of UK towns: 99%. As a yardstick, 7.4% of residents were born outside the UK across Wales’s towns.
Llanberis: 70% of residents speak Welsh
Welsh language skills, residents aged 3 and over, Census 2021.
Welsh language skills · residents aged 3 and over
At the 2021 Census, 1,257 residents aged 3 and over, 70%, said they can speak Welsh, against 16% across Welsh towns: more than in 96% of Welsh towns. No town in Gwynedd beats Caernarfon (82%).
Llanberis sits above 93% of UK towns for residents with no religion (50%)
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: 95% of Llanberis · Gwynedd’s towns 93% · Wales’s towns 90%.
Religion · all residents
Christians make up 41% of residents, against 43% across Wales’s towns. Set beside that, 47% of residents said they have no religion across Wales’s towns. 95% of residents describe themselves as White British.
Above 96% of UK towns: 45% of adults have never married or formed a civil partnership
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 42 people give 50 hours or more of unpaid care a week. Unpaid carers are rarer here than in 72% of UK towns. The share of adults who have never married across Wales’s towns is 38%.
A degree-level qualification for 39% of adults
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
In Llanberis, 39% of adults hold a degree-level qualification, against 31% across Wales’s towns, while 15% have no qualification at all (20%).
Of the 7 towns nearest Llanberis, 1 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 |
|---|---|---|---|---|---|
| Llanberis | 1,838 | — | 44.5 | 20% | 25% |
| Clwt-y-bont | 1,385 | 1.9 mi | 39 | 17% | 31% |
| Llanrug | 1,537 | 3.2 mi | 41.2 | 22% | 34% |
| Bethel | 1,091 | 4.6 mi | 44.7 | 24% | 32% |
| Tregarth | 1,252 | 5.1 mi | 43.8 | 20% | 30% |
| Bethesda | 3,757 | 5.1 mi | 39.8 | 17% | 29% |
| Y Felinheli | 2,333 | 5.5 mi | 42.9 | 21% | 25% |
| Caernarfon | 9,831 | 5.8 mi | 39.6 | 19% | 28% |
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 Llanberis’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 Llanberis’s residents
What is the population of Llanberis?
The 2021 Census counted 1,838 people in Llanberis’s built-up area.
What is the average age in Llanberis?
The median age was 44.5 at the 2021 Census. 10% of residents were 15 to 24 and 20% were 65 or over.
How diverse is Llanberis?
95% 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 Llanberis?
50% said they had no religion and 41% that they were Christian at the 2021 Census; 0.2% were Muslim and 8.7% didn’t answer.
Is Llanberis good for families?
25% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Llanberis’s schools page.
How many people speak Welsh in Llanberis?
1,257 residents aged 3 and over, 70%, 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.