Photo: Oxymoron · CC BY-SA 2.0Fewer car-free households than 88% of UK towns: 8.8%
Flats are home to 3.9% of households, against 23% across England’s towns. Census figures put households with dependent children at 24% in Trimley St Martin. At 1.8%, the share of shared households of unrelated adults is lower than in 80% of UK towns. There were 780 households here at the 2021 Census, home to 1,725 residents.
What the Census says about Trimley St Martin’s people
More with no religion than most
47% of residents answered “no religion” in 2021 and 45% Christian, against 37% and 46% across England’s towns. Ethnicity & religion ↓
Written from the data on this page: ONS Census 2021 (output areas summed to the 2022 built-up area).
A smaller share of residents aged 15 to 24 than 71% of UK towns: 9.1%
Share of residents in each five-year age band, Census 2021.
Half of Trimley St Martin’s residents are over 45.9, older than in just over three in five UK towns. Across the comparison, 12% of residents are aged 15 to 24 across England’s towns. For Trimley St Martin, the census puts residents aged 65 and over at 21%. In Halesworth, the oldest of Suffolk’s towns by this measure, it is 35%.
Broad ages · share of residents
Women and men · all residents
50% women, 50% men
About an even split. Across England, 51% of residents are women.
Full-time students make up 2.6% in Trimley St Martin, less than in 99% 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%.
Residents who moved in within the year make up 8.3%, against 11% across England’s towns. Across England’s towns, full-time students come to 7.9%.
2.2 people per household, fewer than in 73% of UK towns
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.
For Trimley St Martin, the census puts one-person households at 30%.
Above 67% of UK towns: 36% of households live in a detached house
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 18%, against 24% across England’s towns. On average, just over a fifth of households live in a detached house across England’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 25%
Main language · residents aged 3 and over
Residents born abroad were most often born in EU countries (3.5%), then in the Middle East and Asia (0.5%). On average, 18% of residents were born outside the UK across England’s towns. The figure for residents whose main language is English is 97% in Trimley St Martin and 90% across England’s towns.
A larger share of residents with no religion than 85% of UK towns: 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: 93% of Trimley St Martin · Suffolk’s towns 86% · England’s towns 73%.
Religion · all residents
After White British, the most common groups are Other White (3.2%), Mixed or multiple (2.4%) and African (0.2%). The comparison figure for residents with no religion is 37% across England’s towns. Compared with other places, residents who describe themselves as White British are common here: 93%, more than in 61% of UK towns. By contrast, residents who describe themselves as Christian make up 45%, against 46% across England’s towns.
Trimley St Martin ranks above 62% of UK towns on married adults and civil partners: 50%
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
Nearly one in ten residents give unpaid care, about the same as across England’s towns. On the census count, a third of adults have never married or formed a civil partnership. Elsewhere, 44% of adults are married or in a civil partnership across England’s towns.
23% of adults hold a degree-level qualification
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
17% of Trimley St Martin’s adults have no qualification (18% across England’s towns), and 23% have one at degree level (34%).
Around Trimley St Martin, 6 of 7 towns have a higher median age
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 Martin | 1,725 | — | 45.9 | 21% | 24% |
| Trimley St Mary | 3,736 | 1 mi | 48.4 | 25% | 24% |
| Kirton | 1,245 | 1.1 mi | 51.8 | 28% | 24% |
| Felixstowe | 24,218 | 2.4 mi | 51 | 29% | 20% |
| Shotley Gate | 1,418 | 3 mi | 48.2 | 21% | 26% |
| Harwich | 20,219 | 4.6 mi | 46 | 25% | 25% |
| Martlesham Heath | 2,730 | 5.1 mi | 54.5 | 34% | 18% |
| Kesgrave | 14,947 | 5.6 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 Martin’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 Martin’s residents
What is the population of Trimley St Martin?
The 2021 Census counted 1,725 people in Trimley St Martin’s built-up area.
What is the average age in Trimley St Martin?
The median age was 45.9 at the 2021 Census. 9.1% of residents were 15 to 24 and 21% were 65 or over.
How diverse is Trimley St Martin?
93% of residents described themselves as White British in 2021, against 73% across England’s towns and 86% across Suffolk’s towns. 5.5% were born outside the UK.
What religion are people in Trimley St Martin?
47% said they had no religion and 45% that they were Christian at the 2021 Census; 0% were Muslim and 7.1% didn’t answer.
Is Trimley St Martin good for families?
24% of households had dependent children in 2021, against 29% across England’s towns. Schools are on Trimley St Martin’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.