Photo: Dot Potter · CC BY-SA 2.0Households in flats make up 0.8% in Mostyn, less than in 99% of UK towns
Across Wales’s towns, 43% of adults are married or in a civil partnership; in Mostyn, 37%. Few places have as many households without a car or van: 26% here, more than in 88% of UK towns. The 2021 Census counted 889 residents in 388 households. In Mostyn, 98% of residents describe themselves as White British.
Younger than 75% of UK towns: half of Mostyn is under 41
Share of residents in each five-year age band, Census 2021.
Residents aged 15 to 24 make up 11%, against 12% across Wales’s towns. Few places have so few residents aged 65 and over: 20% here, fewer than in 62% of UK towns.
Broad ages · share of residents
Women and men · all residents
52% women, 48% men
About 92 men for every 100 women. Across Wales, 51% of residents are women.
Full-time students: 3.7%, a lower share than 91% 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%.
Nearly one in ten residents lived at another address a year earlier across Wales’s towns, against 7.4% in Mostyn. To put it in context, 8% of adults are full-time students across Wales’s towns.
1.8% of households are unrelated adults sharing a home, below 80% of UK towns
Household make-up at the 2021 Census. Each square is 1% of households.
Against Clwyd’s towns and Wales’s towns
People per household
Wales’s towns.
The average household has 2.3 people, against 2.3 across Wales’s towns. For shared households of unrelated adults, the comparison across Wales’s towns is 3.1%. One-person households: a third of the total. Mostyn has more households with dependent children than 56% of UK towns, at 28%.
Fewer detached houses than 85% of UK towns: 15% of households
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 terraced houses make up 19%, against 29% across Wales’s towns. 0.8% of households live in a flat, less than in 99% of UK towns; 15% in a detached house, against 24% across Wales’s towns.
Only 2.9% of residents were born outside the UK in Mostyn
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
With residents whose main language is English at 99%, Mostyn is ahead of 95% of UK towns on that count. Residents born abroad were most often born in EU countries (1.5%), then in the Middle East and Asia (0.6%). The usual figure: 7.4% of residents were born outside the UK across Wales’s towns.
Speaking Welsh: 15% in Mostyn
Welsh language skills, residents aged 3 and over, Census 2021.
Welsh language skills · residents aged 3 and over
At the 2021 Census, 125 residents aged 3 and over, 15%, said they can speak Welsh, against 16% across Welsh towns: more than in 66% of Welsh towns. No town in Clwyd beats Llanfairfechan (44%).
Mostyn ranks above 85% of UK towns on residents with no religion: 47%
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: 98% of Mostyn · Clwyd’s towns 92% · Wales’s towns 90%.
Religion · all residents
There is little gap on residents who describe themselves as Christian: 43%, about the same as across Wales’s towns.
13% of residents give unpaid care, more than in 99% 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
Where 38% of adults have never married or formed a civil partnership across Wales’s towns, Mostyn has 40%. Unpaid care takes 50 hours a week or more for 43 people. For unpaid carers, the comparison across Wales’s towns is 10%.
Degree-level qualifications: 19% of adults
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
Across Wales’s towns, 20% of adults have no qualification; in Mostyn, 32%, while 19% hold one at degree level (31%).
Older than Mostyn: 6 of the 7 towns nearby
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 |
|---|---|---|---|---|---|
| Mostyn | 889 | — | 41 | 20% | 28% |
| Holywell | 7,741 | 2.5 mi | 43.1 | 20% | 28% |
| Bagillt | 5,943 | 3.3 mi | 42.2 | 19% | 29% |
| Pentre Halkyn | 1,082 | 4.9 mi | 51.1 | 29% | 22% |
| Caldy | 1,227 | 5.1 mi | 55.4 | 34% | 24% |
| West Kirby | 13,383 | 5.5 mi | 50.4 | 28% | 25% |
| Flint | 12,776 | 6.5 mi | 39.8 | 18% | 29% |
| Meliden | 2,002 | 6.6 mi | 46.3 | 24% | 27% |
Health, work and homes have their own pages
What this data can and can’t tell you
- “Clwyd’s towns” and “Wales’s towns” mean their built-up areas. Census comparisons pool every built-up area in Clwyd (or Wales), summed the same way as Mostyn’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 Mostyn’s residents
What is the population of Mostyn?
The 2021 Census counted 889 people in Mostyn’s built-up area.
What is the average age in Mostyn?
The median age was 41 at the 2021 Census. 11% of residents were 15 to 24 and 20% were 65 or over.
How diverse is Mostyn?
98% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 92% across Clwyd’s towns. 2.9% were born outside the UK.
What religion are people in Mostyn?
47% said they had no religion and 43% that they were Christian at the 2021 Census; 0% were Muslim and 9% didn’t answer.
Is Mostyn good for families?
28% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Mostyn’s schools page.
How many people speak Welsh in Mostyn?
125 residents aged 3 and over, 15%, 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.