Photo: Robert Graham · CC BY-SA 2.0In Castleside, 1.5% of households live in a flat or apartment, fewer than in 98% of UK towns
In Castleside, 31% of residents said they have no religion, beside 37% across England’s towns. The 2021 Census counted 1,532 residents in 686 households. Across Castleside, 1.6% of households are unrelated adults sharing a home. Compared with other places, married adults and civil partners are common here: 55%, more than in 88% of UK towns.
What the Census says about Castleside’s people
Older than most towns
Half of Castleside’s residents are under 50.3 and half over, against 44.4 in the typical UK town. 27% are 65 or over, against 18% across England’s towns. Ages ↓
Many carers
174 residents gave unpaid care to someone with an illness, disability or old age in 2021, 12% of those 5 and over: more than in 95% of UK towns. Relationships & caring ↓
Written from the data on this page: ONS Census 2021 (output areas summed to the 2022 built-up area).
Half of Castleside is over 50.3, older than 86% of UK towns
Share of residents in each five-year age band, Census 2021.
The biggest five-year age group is 50–54, with nearly one in ten residents. More residents aged 65 and over than in just over four fifths of UK towns: 27%. Set against 12% across England’s towns, 11% of residents are aged 15 to 24 in Castleside.
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.
A lower share of residents who moved in within the year than 80% of UK towns, at 7.3%
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%.
Managerial and professional jobs account for 34% of Castleside’s adults, routine and semi-routine work for 23%, against 33% and 24% across England’s towns. For comparison, 11% of residents lived at another address a year earlier across England’s towns. Here, 4.8% of adults are full-time students.
Fewer family households than 81% of UK towns: 24% in Castleside
Household make-up at the 2021 Census. Each square is 1% of households.
Against County Durham’s towns and England’s towns
People per household
England’s towns.
By its share of one-person households (27%), Castleside is below 74% of UK towns. A household here holds 2.2 people on average. Against that, 29% of households have dependent children across England’s towns.
Households without a car or van: 12%, a lower share than 68% 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
18% of households live in a terraced house (England’s towns: 24%). For Castleside, the census puts households in detached houses at 34%. Every 8th household or so has no car or van.
Fewer residents born outside the UK than 96% of UK towns: 2.5%
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
The two biggest birthplaces abroad are in EU countries (1.4%) and in Africa (0.5%). 99% of residents have English as their main language, a higher share than in 91% of UK towns. Against that, 18% of residents were born outside the UK across England’s towns.
A higher White British share than 98% of UK towns: 97% of residents
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: 97% of Castleside · County Durham’s towns 93% · England’s towns 73%.
Religion · all residents
Residents who describe themselves as Christian make up 65%, against 46% across England’s towns. As a yardstick, 73% of residents describe themselves as White British across England’s towns.
12% of residents give unpaid care, more than in 95% 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
Adults who have never married make up 28%, against 39% across England’s towns. Against that, nearly one in ten residents give unpaid care across England’s towns. Heavy unpaid care, 50 hours a week or more, falls to 55 residents.
Degree-level qualifications: held by 30% of adults
Highest qualification, residents 16 and over, Census 2021.
Highest qualification · residents 16 and over
Castleside’s adults: 30% with a degree-level qualification and 17% with none, against 34% and 18% across England’s towns.
Among its 7 nearest neighbours, 1 are older than Castleside
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 |
|---|---|---|---|---|---|
| Castleside | 1,532 | — | 50.3 | 27% | 24% |
| Consett | 29,874 | 1.9 mi | 42.7 | 19% | 28% |
| Leadgate | 3,339 | 3.2 mi | 43.2 | 20% | 25% |
| Medomsley | 1,216 | 4.1 mi | 49.6 | 25% | 25% |
| Blackhall Mill | 1,528 | 5.1 mi | 47.3 | 25% | 23% |
| Lanchester | 3,510 | 5.2 mi | 52.2 | 32% | 23% |
| Annfield Plain | 7,786 | 5.6 mi | 42 | 20% | 25% |
| Dipton | 2,653 | 5.7 mi | 45.2 | 23% | 27% |
Health, work and homes have their own pages
What this data can and can’t tell you
- “County Durham’s towns” and “England’s towns” mean their built-up areas. Census comparisons pool every built-up area in County Durham (or England), summed the same way as Castleside’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 Castleside’s residents
What is the population of Castleside?
The 2021 Census counted 1,532 people in Castleside’s built-up area.
What is the average age in Castleside?
The median age was 50.3 at the 2021 Census. 11% of residents were 15 to 24 and 27% were 65 or over.
How diverse is Castleside?
97% of residents described themselves as White British in 2021, against 73% across England’s towns and 93% across County Durham’s towns. 2.5% were born outside the UK.
What religion are people in Castleside?
31% said they had no religion and 65% that they were Christian at the 2021 Census; 0.2% were Muslim and 4.3% didn’t answer.
Is Castleside good for families?
24% of households had dependent children in 2021, against 29% across England’s towns. Schools are on Castleside’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.