Photo: Graham Robson · CC BY-SA 2.0Only 1% of households are unrelated adults sharing a home in Seaton Delaval
Households average 2 people, against 2.4 across England’s towns. Meanwhile, residents who describe themselves as White British are more common here than in 92% of UK towns. 8,012 residents in 3,968 households: that is Seaton Delaval at the 2021 Census. Locally, 8.6% of residents are aged 15 to 24.
Seaton Delaval’s population changed by +8% since 2011, more than in 52% of UK towns
ONS mid-year estimates, each year indexed to mid-2011 = 100. Seaton Delaval’s figure is the small areas (2021 LSOAs) that make up the town.
People, mid-2011 = 100
Change by age, 2011 to 2024
About 7,500 people in 2011; 8,100 in 2024.
Change by age ran from +28% for the 65 and over to −10% for the 16 to 29. Mid-2015 to mid-2016 brought the biggest yearly rise, 170 people.
A median age of 46.5: Seaton Delaval is older than 65% of UK towns
Share of residents in each five-year age band, Census 2021.
55–59 is the most common age band: 7.8% of residents. At 23%, the share of residents aged 65 and over is higher than in 61% of UK towns. In Corbridge, the oldest of Northumberland’s towns by this measure, it is 38%.
Median age of UK towns of 2,500+
■ Seaton Delaval, 46.5. The typical town is 44.4.
Broad ages · share of residents
Women and men · all residents
51% women, 49% men
About an even split. Across England, 51% of residents are women.
3.6% of adults are full-time students, fewer than in 93% 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%.
Compared with 11% across England’s towns, 8.1% of residents lived at another address a year earlier here. The comparison figure for full-time students is 7.9% across England’s towns.
38% of households are one person living alone, more than in 96% of UK towns
Household make-up at the 2021 Census. Each square is 1% of households.
Against Northumberland’s towns and England’s towns
People per household
England’s towns.
Households with dependent children make up 22%, against 29% across England’s towns. The wider picture: 30% of households are one person living alone across England’s towns.
Seaton Delaval sits below 83% of UK towns for households in detached houses (16%)
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
Here 18% of households live in a terraced house, where the figure across England’s towns is 24%. As a yardstick, just over a fifth of households live in a detached house across England’s towns. One household in 5 has no car or van. On households in flats, Seaton Delaval sits higher than 70% of UK towns: 15%.
3.2% of residents were born outside the UK, below 88% 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
The two biggest birthplaces abroad are in EU countries (1.4%) and in Africa (0.6%). More residents whose main language is English than in 91% of UK towns: 99%. The usual figure: 18% of residents were born outside the UK across England’s towns. Across England’s towns, just over a fifth of those born abroad arrived in 2017 or later; here, 16%.
Seaton Delaval ranks above 74% 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: 96% of Seaton Delaval · Northumberland’s towns 96% · England’s towns 73%.
Religion · all residents
After White British, the largest groups are Other White (1.7%), Mixed or multiple (1%) and Indian (0.3%). Across the comparison, 37% of residents said they have no religion across England’s towns. In Seaton Delaval, 49% of residents describe themselves as Christian, beside 46% across England’s towns.
A larger share of unpaid carers than 75% of UK towns: 10%
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
238 people care, unpaid, for 50 hours or more a week. Fewer married adults and civil partners than in 70% of UK towns: 45%. The usual figure: nearly one in ten residents give unpaid care across England’s towns. Across England’s towns, nearly two in five adults have never married or formed a civil partnership; in Seaton Delaval, 34%.
28% of adults have a degree-level qualification
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
28% of Seaton Delaval’s adults have a degree-level qualification, against 34% across England’s towns; 17% have none (18%).
Ranked by age, 153rd oldest of 424 UK towns this size
Median age, Census 2021. Hover a dot for its students and residents born abroad; click for its page.
Ages run from 28.4 in Tidworth to 65.3 in Barton on Sea. Nearest to Seaton Delaval in age: Otford and Kemsing (46.4), Pembroke (46.4), Pelton and Ouston (46.5) and Eckington (46.5).
Among its 7 nearest neighbours, 3 are older than Seaton Delaval
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 |
|---|---|---|---|---|---|
| Seaton Delaval | 8,012 | — | 46.5 | 23% | 22% |
| New Hartley | 1,764 | 0.9 mi | 46.8 | 22% | 28% |
| Seghill | 2,799 | 1.2 mi | 48.2 | 25% | 20% |
| Seaton Sluice | 2,957 | 2 mi | 55.4 | 34% | 18% |
| Backworth | 4,483 | 2.4 mi | 36 | 9.8% | 39% |
| Cramlington | 28,846 | 2.5 mi | 45.8 | 23% | 26% |
| Shiremoor | 6,965 | 2.5 mi | 38.4 | 16% | 31% |
| Dudley | 4,799 | 2.7 mi | 44.2 | 21% | 25% |
Health, work and homes have their own pages
What this data can and can’t tell you
- “Northumberland’s towns” and “England’s towns” mean their built-up areas. Census comparisons pool every built-up area in Northumberland (or England), summed the same way as Seaton Delaval’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. Seaton Delaval’s trend uses the small areas (2021 LSOAs) with most of their people inside it: 8,012 people in 2021, against 8,012 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 Seaton Delaval’s residents
What is the population of Seaton Delaval?
The 2021 Census counted 8,012 people in Seaton Delaval’s built-up area. The ONS estimates the same small areas held 8,100 people in mid-2024, 8% more than in 2011.
What is the average age in Seaton Delaval?
The median age was 46.5 at the 2021 Census, older than 65% of UK towns. 8.6% of residents were 15 to 24 and 23% were 65 or over.
How diverse is Seaton Delaval?
96% of residents described themselves as White British in 2021, against 73% across England’s towns and 96% across Northumberland’s towns. 3.2% were born outside the UK.
What religion are people in Seaton Delaval?
45% said they had no religion and 49% that they were Christian at the 2021 Census; 0.5% were Muslim and 5.3% didn’t answer.
Is Seaton Delaval good for families?
22% of households had dependent children in 2021, against 29% across England’s towns. Schools are on Seaton Delaval’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) · 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.