Church of St. Morhaiarn · Photo: RobinLeicester · CC BY-SA 3.0A larger share of households with dependent children than 94% of UK towns: 36%
The average household has 2.6 people, against 2.3 across Wales’s towns. Gwalchmai had 386 residents and 149 households at the 2021 Census, with a median age of 40. Here, 64% of households live in a detached house. Few places have so few households in flats: 3.3% here, fewer than in 92% of UK towns.
A median age of 40: Gwalchmai is younger than 80% of UK towns
Share of residents in each five-year age band, Census 2021.
With residents aged 15 to 24 at 13%, Gwalchmai is ahead of 94% of UK towns on that count. On the census count, 18% of residents are 65 or over.
Broad ages · share of residents
Women and men · all residents
51% women, 49% men
About an even split. Across Wales, 51% of residents are women.
Gwalchmai sits below 99% of UK towns for residents who moved in within the year (3.4%)
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%.
Nearly one in ten adults are full-time students, about the same as across Wales’s towns. Residents who moved in within the year make up 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.
A smaller share of shared households of unrelated adults than 96% of UK towns: 1.3%
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.
In Gwalchmai, 28% of households are one person living alone, beside 32% across Wales’s towns. Set beside that, 3.1% of households are unrelated adults sharing a home across Wales’s towns.
Households in terraced houses make up 8% in Gwalchmai, less than in 93% 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
Where 21% of households have no car or van across Wales’s towns, Gwalchmai has 11%. As a yardstick, 29% of households live in a terraced house across Wales’s towns.
A smaller share of residents born outside the UK than 60% of UK towns: 5.5%
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
By birthplace, the largest groups from abroad were born in EU countries (3.1%) and in the Middle East and Asia (0.8%). For comparison, 7.4% of residents were born outside the UK across Wales’s towns. Few places have so few residents whose main language is English: 96% here, fewer than in 70% of UK towns.
Welsh is spoken by 67% of Gwalchmai’s 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 252 people, 67% of those aged 3 and over, said they can: more than in 96% of Welsh towns. No town in Gwynedd beats Caernarfon (82%).
Below 74% of UK towns: 87% of residents describe themselves as White British
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: 87% of Gwalchmai · Gwynedd’s towns 93% · Wales’s towns 90%.
Religion · all residents
1% of residents are Muslim. The share of residents who describe themselves as White British across Wales’s towns is 90%. Lower than in 69% of UK towns: 47% of residents describe themselves as Christian.
Gwalchmai ranks above 70% of UK towns on adults who have never married: 36%
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
10 residents give 50 hours or more of unpaid care each week. Across Wales’s towns, adults who have never married come to 38%. Few places have as many unpaid carers: 11% here, more than in just over four fifths of UK towns. Married people and civil partners make up 47% of adults, against 43% across Wales’s towns.
Adults qualified to degree level or above: 36%
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
16% of Gwalchmai’s adults have no qualification (20% across Wales’s towns), and 36% have one at degree level (31%). Many of the 17% whose highest qualification is A levels are students working towards a degree.
Of the 7 towns nearest Gwalchmai, 5 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 |
|---|---|---|---|---|---|
| Gwalchmai | 386 | — | 40 | 18% | 36% |
| Bodedern | 1,193 | 4.2 mi | 41.2 | 20% | 29% |
| Llangefni | 5,264 | 4.4 mi | 39.5 | 20% | 31% |
| Llanerchymedd | 1,155 | 5.2 mi | 44.3 | 21% | 30% |
| Gaerwen | 1,277 | 6.4 mi | 39.8 | 19% | 30% |
| Valley | 2,003 | 6.5 mi | 51.2 | 29% | 23% |
| Benllech | 2,072 | 8.8 mi | 62 | 45% | 13% |
| Llanfair Pwllgwyngyll | 2,905 | 9.1 mi | 52 | 33% | 22% |
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 Gwalchmai’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 Gwalchmai’s residents
What is the population of Gwalchmai?
The 2021 Census counted 386 people in Gwalchmai’s built-up area.
What is the average age in Gwalchmai?
The median age was 40 at the 2021 Census. 13% of residents were 15 to 24 and 18% were 65 or over.
How diverse is Gwalchmai?
87% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 93% across Gwynedd’s towns. 5.5% were born outside the UK.
What religion are people in Gwalchmai?
42% said they had no religion and 47% that they were Christian at the 2021 Census; 1% were Muslim and 8.6% didn’t answer.
Is Gwalchmai good for families?
36% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Gwalchmai’s schools page.
How many people speak Welsh in Gwalchmai?
252 residents aged 3 and over, 67%, 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.