Street Farmhouse · Photo: Olehenriksen · CC BY-SA 4.03.9% of households live in a flat or apartment, fewer than in 88% of UK towns
With households in detached houses at 43%, Trimley St Mary is ahead of 82% of UK towns on that count. The town’s 1,660 households held 3,736 residents at the 2021 Census. In Trimley St Mary, 28% of adults have never married or formed a civil partnership. The median age in the town is 48.4, higher than in just over three quarters of UK towns.
Fewer residents aged 15 to 24 than 77% of UK towns: 8.9%
Share of residents in each five-year age band, Census 2021.
More residents are 60–64 than any other five-year age: nearly one in ten residents, 1.5 times the share across England’s towns. Here, a quarter of residents are 65 or over. As a reference point, 12% of residents are aged 15 to 24 across England’s towns.
Median age of UK towns of 2,500+
■ Trimley St Mary, 48.4. 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 England, 51% of residents are women. Women live longer than men, so towns with many older residents have more women.
Below 98% of UK towns: 5.7% of residents lived at another address a year earlier
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%.
Full-time students make up 3.9% of adults, against 7.9% across England’s towns. The benchmark for residents who moved in within the year across England’s towns: 11%.
Fewer households with dependent children than 77% of UK towns: 24%
Household make-up at the 2021 Census. Each square is 1% of households.
Against Suffolk’s towns and England’s towns
People per household
England’s towns.
In Trimley St Mary the average household is 2.2 people, beside 2.4 across England’s towns. Shared households of unrelated adults are rarer here than in just over three quarters of UK towns. The usual figure: 29% of households have dependent children across England’s towns. Locally, 28% of households are one person living alone.
13% of households live in a terraced house, fewer than in 80% 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
Households without a car or van: 11% here and 24% across England’s towns.
Residents born outside the UK: 5.4%, a lower share than 60% 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 25%
When those born abroad arrived
Main language · residents aged 3 and over
By birthplace, the largest groups from abroad were born in EU countries (3.1%) and in Africa (0.8%). Measured more widely, 18% of residents were born outside the UK across England’s towns. Among those born abroad, the share arriving in 2017 or later is 11% (England’s towns: 21%).
Trimley St Mary ranks above 77% of UK towns on residents with no religion: 45%
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: 94% of Trimley St Mary · Suffolk’s towns 86% · England’s towns 73%.
Religion · all residents
48% of residents describe themselves as Christian, against 46% across England’s towns. Measured more widely, 37% of residents said they have no religion across England’s towns. In Trimley St Mary, 94% of residents describe themselves as White British.
In Trimley St Mary, 52% of adults are married or in a civil partnership, more than in 73% 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
110 residents give 50 hours or more of unpaid care each week. On average, 44% of adults are married or in a civil partnership across England’s towns. At 9.2%, the share of unpaid carers is in line with the figure across England’s towns.
Degree-level qualifications reach 22% of adults
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
In Trimley St Mary, 22% of adults hold a degree-level qualification, against 34% across England’s towns, while 20% have no qualification at all (18%).
196th highest median age among 530 UK towns of 3,000 to 5,000
Median age, Census 2021. Hover a dot for its students and residents born abroad; click for its page.
Bailrigg is the youngest (18.9); Milford on Sea the oldest (64.6). Nearest to Trimley St Mary in age: Mytholmroyd (48.4), Hemingford Grey (48.4), Mayland (48.4) and Windlesham (48.4).
Trimley St Mary and its 7 nearest towns: 3 of them 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 |
|---|---|---|---|---|---|
| Trimley St Mary | 3,736 | — | 48.4 | 25% | 24% |
| Trimley St Martin | 1,725 | 1 mi | 45.9 | 21% | 24% |
| Felixstowe | 24,218 | 1.4 mi | 51 | 29% | 20% |
| Kirton | 1,245 | 2 mi | 51.8 | 28% | 24% |
| Shotley Gate | 1,418 | 2.8 mi | 48.2 | 21% | 26% |
| Harwich | 20,219 | 4.2 mi | 46 | 25% | 25% |
| Martlesham Heath | 2,730 | 6.1 mi | 54.5 | 34% | 18% |
| Kesgrave | 14,947 | 6.6 mi | 44.1 | 20% | 33% |
Health, work and homes have their own pages
What this data can and can’t tell you
- “Suffolk’s towns” and “England’s towns” mean their built-up areas. Census comparisons pool every built-up area in Suffolk (or England), summed the same way as Trimley St Mary’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 Trimley St Mary’s residents
What is the population of Trimley St Mary?
The 2021 Census counted 3,736 people in Trimley St Mary’s built-up area.
What is the average age in Trimley St Mary?
The median age was 48.4 at the 2021 Census, older than 76% of UK towns. 8.9% of residents were 15 to 24 and 25% were 65 or over.
How diverse is Trimley St Mary?
94% of residents described themselves as White British in 2021, against 73% across England’s towns and 86% across Suffolk’s towns. 5.4% were born outside the UK.
What religion are people in Trimley St Mary?
45% said they had no religion and 48% that they were Christian at the 2021 Census; 0.4% were Muslim and 6.1% didn’t answer.
Is Trimley St Mary good for families?
24% of households had dependent children in 2021, against 29% across England’s towns. Schools are on Trimley St Mary’s schools page.
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). 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.