Photo: Stephen McKay · CC BY-SA 2.0A Welsh-speaking village: 74% of Llanerchymedd’s residents speak Welsh
In Llanerchymedd, 4.7% of households live in a flat or apartment, beside 14% across Wales’s towns. At the 2021 Census, 1,155 people lived locally, in 489 households. Households with dependent children: 30% of the total. Few places have as many households in terraced houses: 36% here, more than in 91% of UK towns.
What the Census says about Llanerchymedd’s people
A Welsh-speaking village
829 residents, 74% of those aged 3 and over, said they can speak Welsh in 2021, more than in 97% of Welsh towns. Welsh language ↓
Written from the data on this page: ONS Census 2021 (output areas summed to the 2022 built-up area).
A larger share of residents aged 15 to 24 than 54% of UK towns: 9.9%
Share of residents in each five-year age band, Census 2021.
There is little gap on residents aged 65 and over: 21%, about the same as across Wales’s towns. Half of Llanerchymedd’s residents are under 44.3, younger than in just over half of UK towns. As a reference point, 12% of residents are aged 15 to 24 across Wales’s towns. No age band is larger than 50–54: 8.4% of residents.
Broad ages · share of residents
Women and men · all residents
50% women, 50% men
About an even split. Across Wales, 51% of residents are women.
More full-time students than 68% of UK towns: 5.3%
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%.
Managerial and professional jobs account for just over a quarter of Llanerchymedd’s adults, routine and semi-routine work for 29%, against 29% and 27% across Wales’s towns. Residents who moved in within the year are rarer here than in nearly two thirds of UK towns. For full-time students, the comparison across Wales’s towns is 8%.
The Census was taken on 21 March 2021, in term time, so students were counted at their term addresses.
1.6% of households are unrelated adults sharing a home, below 87% 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.
Households average 2.3 people, against 2.3 across Wales’s towns. Here, 28% of households are one person living alone. By way of comparison, 3.1% of households are unrelated adults sharing a home across Wales’s towns.
Households in detached houses: 41%, a higher share than 76% 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
11% of households have no car or van, against 21% across Wales’s towns. For comparison, 24% of households live in a detached house across Wales’s towns.
Only 1.7% of residents were born outside the UK in Llanerchymedd
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
Residents born abroad were most often born in EU countries (1%), then in the Middle East and Asia (0.7%). Compared with other places, residents whose main language is English are common here: 99%, more than in 95% of UK towns. As a yardstick, 7.4% of residents were born outside the UK across Wales’s towns.
Llanerchymedd’s Welsh speakers make up 74% 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 829 people, 74% of those aged 3 and over, said they can: more than in 97% of Welsh towns. Within Gwynedd, Caernarfon has the largest share, 82%.
A larger share of residents who describe themselves as White British than 96% of UK towns: 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 Llanerchymedd · Gwynedd’s towns 93% · Wales’s towns 90%.
Religion · all residents
Set against 47% across Wales’s towns, 44% of residents said they have no religion in Llanerchymedd. For comparison, 90% of residents describe themselves as White British across Wales’s towns. The groups that follow White British are Other White (1.3%), Mixed or multiple (0.9%) and Indian (0.4%).
44% of adults are married or in a civil partnership, fewer than in 77% 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
Nothing unusual on adults who have never married: 38%, close to the figure across Wales’s towns. For 50 residents, unpaid care runs to 50 hours or more a week. To put it in context, 43% of adults are married or in a civil partnership across Wales’s towns.
Qualified to degree level: 30% of adults
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
30% of Llanerchymedd’s adults have a degree-level qualification, against 31% across Wales’s towns; 18% have none (20%).
Older than Llanerchymedd: 4 of the 7 towns nearby
Nearby built-up areas coloured by median age, Census 2021. Tap a town for its page.
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 Llanerchymedd’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 Llanerchymedd’s residents
What is the population of Llanerchymedd?
The 2021 Census counted 1,155 people in Llanerchymedd’s built-up area.
What is the average age in Llanerchymedd?
The median age was 44.3 at the 2021 Census. 9.9% of residents were 15 to 24 and 21% were 65 or over.
How diverse is Llanerchymedd?
97% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 93% across Gwynedd’s towns. 1.7% were born outside the UK.
What religion are people in Llanerchymedd?
44% said they had no religion and 50% that they were Christian at the 2021 Census; 0% were Muslim and 5% didn’t answer.
Is Llanerchymedd good for families?
30% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Llanerchymedd’s schools page.
How many people speak Welsh in Llanerchymedd?
829 residents aged 3 and over, 74%, 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.