Photo: Roger Cornfoot · CC BY-SA 2.0A Welsh-speaking town: 75% of Llangefni’s residents speak Welsh
Compared with 43% across Wales’s towns, two in five adults are married or in a civil partnership here. Census day 2021: 5,264 residents and 2,278 households in Llangefni. For Llangefni, the census puts one-person households at 35%. The median age locally is 39.5, lower than in 83% of UK towns.
What the Census says about Llangefni’s people
A Welsh-speaking town
3,809 residents, 75% of those aged 3 and over, said they can speak Welsh in 2021, more than in 98% of Welsh towns. Welsh language ↓
Written from the data on this page: ONS Census 2021 (output areas summed to the 2022 built-up area) and ONS mid-year population estimates.
Llangefni grew +13% from 2011 to 2024, ahead of 70% of UK towns
ONS mid-year estimates, each year indexed to mid-2011 = 100. Llangefni’s figure is the small areas (2021 LSOAs) that make up the town.
People, mid-2011 = 100
Change by age, 2011 to 2024
About 5,100 people in 2011; 5,800 in 2024.
The largest rise in a single year came from mid-2023 to mid-2024: 160 people. Growth was strongest among the 0 to 15 (+18%) and weakest among the 45 to 64 (+6%).
More residents aged 15 to 24 than 83% of UK towns: 11%
Share of residents in each five-year age band, Census 2021.
5–9 is the most common age band: 7.6% of residents, 1.3 times the share across Wales’s towns. Residents aged 65 and over account for 20%. Across Wales’s towns, 12% of residents are aged 15 to 24.
Median age of UK towns of 2,500+
■ Llangefni, 39.5. The typical town is 44.4.
Broad ages · share of residents
Women and men · all residents
52% women, 48% men
About 94 men for every 100 women. Across Wales, 51% of residents are women.
More students than 91% of UK towns: 7% of adults in Llangefni
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%.
8% of residents had moved in within the year before the Census, fewer than the 9.1% across Wales’s towns. Across Wales’s towns, 29% of adults are in managerial and professional jobs and 27% in routine or semi-routine work; Llangefni has 27% and 31%.
The Census was taken on 21 March 2021, in term time, so students were counted at their term addresses.
Llangefni: 31% of households have dependent children, above 78% 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.
Shared households of unrelated adults make up 1.6%, against 3.1% across Wales’s towns. The comparison figure for households with dependent children is 27% across Wales’s towns. Households here average 2.3 people each.
A higher share of households in terraced houses than 67% of UK towns, at 24%
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 in flats tops 73% of UK towns: 16%. The benchmark for households in terraced houses across Wales’s towns: 29%. Here, 21% of households have no car or van.
3.7% of residents were born outside the UK, fewer than in 82% of UK towns
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%
When those born abroad arrived
Main language · residents aged 3 and over
Just over a fifth of the town’s residents born abroad came in 2017 or later, set against 23% across Wales’s towns. Few places have as many residents whose main language is English: 98% here, more than in 69% of UK towns. Across the comparison, 7.4% of residents were born outside the UK across Wales’s towns. Among residents born abroad, the largest groups were born in EU countries (1.8%) and in the Middle East and Asia (0.7%).
Llangefni’s residents: 75% speak Welsh
Welsh language skills, residents aged 3 and over, Census 2021.
Welsh language skills · residents aged 3 and over
Against 16% across Welsh towns, 75% of residents aged 3 and over can speak Welsh here (3,809 people): more than in 98% of Welsh towns. The highest share in Gwynedd belongs to Caernarfon (82%).
A larger share of residents who describe themselves as White British than 85% of UK towns: 96%
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 Llangefni · Gwynedd’s towns 93% · Wales’s towns 90%.
Religion · all residents
Across Wales’s towns, 47% of residents said they have no religion; in Llangefni, 42%. For comparison, 90% of residents describe themselves as White British across Wales’s towns. Muslims make up 1.3% of residents.
Adults who have never married: 40%, a higher share than 88% 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
Unpaid carers giving 50 hours or more a week: 131. At 8.6%, the share of unpaid carers is lower than in 70% of UK towns. Across Wales’s towns, adults who have never married come to 38%.
Among adults, 30% hold a degree-level qualification
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
19% of Llangefni’s adults have no qualification (20% across Wales’s towns), and 30% have one at degree level (31%). The highest qualification of 17% is A levels, often students still at university.
77th youngest of 516 UK towns of 4,000 to 7,000 people
Median age, Census 2021. Hover a dot for its students and residents born abroad; click for its page.
Bailrigg is the youngest (18.9); Barton on Sea the oldest (65.3). Nearest to Llangefni in age: Albrighton (39.3), Acrefair and Cefn-mawr (39.3), Shotton Colliery (39.7) and Tibshelf (39.7).
Median age: 6 of the 7 towns around Llangefni 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 |
|---|---|---|---|---|---|
| Llangefni | 5,264 | — | 39.5 | 20% | 31% |
| Gaerwen | 1,277 | 2.9 mi | 39.8 | 19% | 30% |
| Llanfair Pwllgwyngyll | 2,905 | 5 mi | 52 | 33% | 22% |
| Benllech | 2,072 | 5.5 mi | 62 | 45% | 13% |
| Llanerchymedd | 1,155 | 5.7 mi | 44.3 | 21% | 30% |
| Menai Bridge | 3,045 | 6.1 mi | 47.3 | 24% | 20% |
| Y Felinheli | 2,333 | 6.6 mi | 42.9 | 21% | 25% |
| Bangor | 16,994 | 7.5 mi | 26.4 | 12% | 26% |
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 Llangefni’s figures, so households in open countryside are left out. The population trend compares with the whole county and nation.
- Estimates since 2021 are modelled. The ONS builds mid-year estimates from the Census, births, deaths and migration records. Llangefni’s trend uses the small areas (2021 LSOAs) with most of their people inside it: 5,502 people in 2021, against 5,264 in the built-up area.
- 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 Llangefni’s residents
What is the population of Llangefni?
The 2021 Census counted 5,264 people in Llangefni’s built-up area. The ONS estimates the same small areas held 5,800 people in mid-2024, 13% more than in 2011.
What is the average age in Llangefni?
The median age was 39.5 at the 2021 Census, younger than 83% of UK towns. 11% of residents were 15 to 24 and 20% were 65 or over.
How diverse is Llangefni?
96% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 93% across Gwynedd’s towns. 3.7% were born outside the UK.
What religion are people in Llangefni?
42% said they had no religion and 50% that they were Christian at the 2021 Census; 1.3% were Muslim and 6.4% didn’t answer.
Is Llangefni good for families?
31% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Llangefni’s schools page.
How many people speak Welsh in Llangefni?
3,809 residents aged 3 and over, 75%, 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) · ONS mid-year population estimates for 2021 LSOAs, mid-2011 to mid-2024. 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.