Photo: Djmckee1 · CC BY 3.020% of households have dependent children, below 95% of UK towns
Households average 2 people, against 2.4 across England’s towns. Seghill is home to 2,799 residents in 1,400 households, by the 2021 Census. In Seghill, 46% of residents said they have no religion. Few places have as many households without a car or van: 21% here, more than in 76% of UK towns.
What the Census says about Seghill’s people
Fewer people than in 2011
ONS mid-year estimates put Seghill at 3,000 in 2011 and 2,800 in 2024, down 6%, against 10% for England: slower growth than in 98% of UK towns. Since 2011 ↓
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.
A change of −6% since 2011 leaves Seghill behind 98% of UK towns
ONS mid-year estimates, each year indexed to mid-2011 = 100. Seghill’s figure is the small areas (2021 LSOAs) that make up the town.
People, mid-2011 = 100
Change by age, 2011 to 2024
About 3,000 people in 2011; 2,800 in 2024.
Growth was strongest among the 65 and over (+36%) and weakest among the 30 to 44 (−28%).
Half of Seghill is over 48.2, older than 75% of UK towns
Share of residents in each five-year age band, Census 2021.
No age band is larger than 55–59: nearly one in ten residents, 1.3 times the share across England’s towns. Residents aged 65 and over are more common here than in 71% of UK towns. The share of residents aged 15 to 24 stands at 12%.
Median age of UK towns of 2,500+
■ Seghill, 48.2. The typical town is 44.4.
Broad ages · share of residents
Women and men · all residents
49% women, 51% men
About an even split. Across England, 51% of residents are women.
7.2% of residents lived at another address a year earlier, fewer than in 82% 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%.
Full-time students: 4.7% here and 7.9% across England’s towns. Elsewhere, just over one in ten residents lived at another address a year earlier across England’s towns.
Seghill ranks below 99% of UK towns on shared households of unrelated adults: 1.1%
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.
In Seghill, 38% of households are one person living alone, beside 30% across England’s towns. Across England’s towns, the share of shared households of unrelated adults is 4.3%.
Below 68% of UK towns: 16% of households live in a terraced 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
13% of households live in a flat or apartment, against 23% across England’s towns. In Seghill, a quarter of households live in a detached house. Measured more widely, 24% of households live in a terraced house across England’s towns.
2.7% born outside the UK, fewer than in 95% 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%
Main language · residents aged 3 and over
By birthplace, the largest groups from abroad were born in EU countries (1.3%) and in the Americas, Oceania and elsewhere (0.6%). Seghill has more residents whose main language is English than 97% of UK towns, at 99%. Across England’s towns, the share of residents born outside the UK is 18%.
A larger share of residents who describe themselves as White British than 99% of UK towns: 98%
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 Seghill · Northumberland’s towns 96% · England’s towns 73%.
Religion · all residents
Residents who describe themselves as Christian make up 49%, against 46% across England’s towns. As a reference point, 73% of residents describe themselves as White British across England’s towns.
Seghill sits above 82% of UK towns for unpaid carers (11%)
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 care takes 50 hours a week or more for 106 people. Few places have as many adults who have never married: 35% here, more than in nearly two thirds of UK towns. As a reference point, 8.7% of residents give unpaid care across England’s towns. 46% of adults are married or in a civil partnership, against 44% across England’s towns.
25% of adults have a degree-level qualification
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
Across England’s towns, 34% of adults have a degree-level qualification; in Seghill, 25%, and 20% have none, against 18%.
210th highest median age among 514 UK towns of 2,500 to 4,000
Median age, Census 2021. Hover a dot for its students and residents born abroad; click for its page.
Keele is the youngest (20.6); West Chiltington the oldest (63.1). Nearest to Seghill in age: Wargrave (48), Woolton Hill and Highclere (48.1), Whiston (48.2) and Newbold Verdon (48.2).
Every neighbour of Seghill has a younger population
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 |
|---|---|---|---|---|---|
| Seghill | 2,799 | — | 48.2 | 25% | 20% |
| Seaton Delaval | 8,012 | 1.2 mi | 46.5 | 23% | 22% |
| Dudley | 4,799 | 1.5 mi | 44.2 | 21% | 25% |
| New Hartley | 1,764 | 1.8 mi | 46.8 | 22% | 28% |
| Killingworth | 12,180 | 1.8 mi | 43.6 | 21% | 26% |
| Cramlington | 28,846 | 1.9 mi | 45.8 | 23% | 26% |
| Backworth | 4,483 | 2.1 mi | 36 | 9.8% | 39% |
| Shiremoor | 6,965 | 2.6 mi | 38.4 | 16% | 31% |
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 Seghill’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. Seghill’s trend uses the small areas (2021 LSOAs) with most of their people inside it: 2,799 people in 2021, against 2,799 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 Seghill’s residents
What is the population of Seghill?
The 2021 Census counted 2,799 people in Seghill’s built-up area. The ONS estimates the same small areas held 2,800 people in mid-2024, 6% fewer than in 2011.
What is the average age in Seghill?
The median age was 48.2 at the 2021 Census, older than 75% of UK towns. 12% of residents were 15 to 24 and 25% were 65 or over.
How diverse is Seghill?
98% of residents described themselves as White British in 2021, against 73% across England’s towns and 96% across Northumberland’s towns. 2.7% were born outside the UK.
What religion are people in Seghill?
46% said they had no religion and 49% that they were Christian at the 2021 Census; 0.1% were Muslim and 4.1% didn’t answer.
Is Seghill good for families?
20% of households had dependent children in 2021, against 29% across England’s towns. Schools are on Seghill’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.