Photo: Jaggery · CC BY-SA 2.0

36.2Median age

Who lives here · ONS Census 2021

A median age of 36.2: Underwood is younger than 93% of UK towns

The share of households in detached houses trails 99% of UK towns: 3.9%. 2,134 residents in 860 households: that is Underwood at the 2021 Census. On the census count, 61% of households live in a terraced house. Few places have as many residents with no religion: 53% here, more than in 97% of UK towns.

15%aged 65 or over 4.9%born abroad 860households

What stands out · In brief

What the Census says about Underwood’s people

36.2median age, younger than 93% of UK towns

Younger than most towns

Half of Underwood’s residents are under 36.2 and half over, against 44.4 in the typical UK town. 11% are 15 to 24 and 15% are 65 or over. Ages ↓

Written from the data on this page: ONS Census 2021 (output areas summed to the 2022 built-up area).

Ages

Below 90% of UK towns: 15% of residents are 65 or over

Share of residents in each five-year age band, Census 2021.

UnderwoodWales’s towns

0–410–1420–2430–3440–4450–5460–6470–7480–84

30–34 is the most common age band: nearly one in ten residents, 1.3 times the share across Wales’s towns. As a yardstick, 21% of residents are 65 or over across Wales’s towns. On the census count, 11% of residents are aged 15 to 24.

Broad ages · share of residents

Under 1522%

15 to 2411%

25 to 4427%

45 to 6424%

65 and over15%

UnderwoodGwent’s townsWales’s towns

Women and men · all residents

52% women, 48% men

Underwood

Wales

WomenMen

About 91 men for every 100 women. Across Wales, 51% of residents are women.

Students & newcomers

A smaller share of residents who moved in within the year than 97% of UK towns: 6%

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

Full-time students4.2%

Higher managerial and professional4.5%

Lower managerial and professional14%

Intermediate11%

Small employers and self-employed7.7%

Supervisory and technical8.5%

Semi-routine18%

Routine21%

Never worked or long-term unemployed11%

UnderwoodGwent’s townsWales’s towns

Address a year before the Census

Residents who lived somewhere else a year earlier. The bar runs to 25%.

Underwood

6.1%

Wales’s towns

9.8%

Moved within the UKTerm-time addressMoved from abroad

Moved in within a year

127

residents, 6%; Wales’s towns 9.1%

Of them from abroad

0.3× Wales’s share

4.2% of adults are full-time students, against 8% across Wales’s towns. The comparison figure for residents who moved in within the year is 9.1% across Wales’s towns.

Households

2.5 people per household, more than in 90% of UK towns

Household make-up at the 2021 Census. Each square is 1% of households.

Living alone, 66+ 12%Living alone, under 66 18%Families with dependent children 31%Couples and families, no young children 37%Shared houses and other 2.9%

Against Gwent’s towns and Wales’s towns

Underwood

Gwent’s towns

Wales’s towns

People per household

1 person30%

2 people31%

3 people18%

4 people11%

5 or more9.7%

Wales’s towns.

Set against 27% across Wales’s towns, 31% of households have dependent children in Underwood. The census found that 2.9% of households are unrelated adults sharing a home here.

Homes & cars

A lower share of households in flats than 89% of UK towns, at 3.7%

Accommodation type and cars or vans per household, Census 2021. Owning and renting are on Cost of living.

Type of home

Underwood

Gwent’s towns

Wales’s towns

DetachedSemi-detachedTerracedFlat or maisonetteCaravan or other

Cars or vans · share of households

No car or van21%

One43%

Two28%

Three or more8.1%

UnderwoodGwent’s townsWales’s towns

Households without a car or van make up 21%, close to the figure across Wales’s towns. Set beside that, 14% of households live in a flat or apartment across Wales’s towns.

Where people were born

4.9% born outside the UK, fewer than in 65% 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 10%

Underwood

4.9%

Gwent’s towns

6.1%

Wales’s towns

7.4%

EU countriesRest of EuropeMiddle East and AsiaAfricaAmericas, Oceania, other

When those born abroad arrived

UnderwoodWales’s towns

Before 19711971–801981–901991–20002001–102011–132014–162017–192020–21

Main language · residents aged 3 and over

English is main language98%

Another main language, speaks English very well or well2.3%

Another main language, little or no English0.1%

UnderwoodGwent’s townsWales’s towns

Across Wales’s towns, nearly a quarter of those born abroad arrived in 2017 or later; here, 6.7%. Measured more widely, 7.4% of residents were born outside the UK across Wales’s towns. The largest groups were born in EU countries (2.9%) and in Africa (0.8%).

Welsh language

Welsh in Underwood: 6.6% of residents speak it

Welsh language skills, residents aged 3 and over, Census 2021.

Welsh language skills · residents aged 3 and over

Can speak Welsh6.6%

Can speak, read and write Welsh4.8%

Any Welsh skill (including understanding only)9.9%

UnderwoodGwent’s townsWales’s towns

At the 2021 Census, 136 residents aged 3 and over, 6.6%, said they can speak Welsh, against 16% across Welsh towns: fewer than in 98% of Welsh towns. Top of Gwent: Abertridwr and Senghenydd, at 14%.

Ethnicity & religion

39% describe themselves as Christian, fewer than in 93% of UK towns

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

UnderwoodGwent’s townsWales’s towns

Other White2.9%

Asian0.8%

Mixed8%

Black0.6%

Other0.5%

0%5%10%

White British, not charted: 87% of Underwood · Gwent’s towns 91% · Wales’s towns 90%.

Religion · all residents

UnderwoodGwent’s townsWales’s towns

No religion53%

Christian39%

Muslim0.8%

Hindu, Sikh, Jewish, Buddhist0.2%

Other religion0.9%

Didn’t answer5.8%

0%30%60%

Across Wales’s towns, 90% of residents describe themselves as White British; in Underwood, 87%. The share of residents who describe themselves as Christian across Wales’s towns is 43%. The groups that follow White British are Mixed or multiple (8%), Other White (2.9%) and Pakistani (0.3%).

Relationships & caring

Adults who have never married make up 39% in Underwood, more than in 88% 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

Never married or in a civil partnership39%

Married or civil partnership42%

Separated2.8%

Divorced8.5%

Widowed7%

UnderwoodGwent’s townsWales’s towns

212residents give unpaid care to someone with an illness, disability or old age: 11%, against 10% in Wales’s towns

Unpaid care given · share of residents 5 and over

Up to 19 hours a week4.2%

20 to 49 hours2.4%

50 hours or more3.9%

Some 79 people give 50 hours or more of unpaid care a week. As a reference point, 38% of adults have never married or formed a civil partnership across Wales’s towns. At 42%, the share of married adults and civil partners is lower than in 83% of UK towns. Unpaid carers: 11% here and 10% across Wales’s towns.

Qualifications

Degree-level qualifications: held by 20% of adults

Highest qualification, residents 16 and over, Census 2021.

Highest qualification · residents 16 and over

No qualifications27%

Apprenticeship5.8%

A levels or similar17%

Degree level20%

UnderwoodGwent’s townsWales’s towns

At degree level, Underwood counts 20% of its adults, against 31% across Wales’s towns; at the other end, 27% have no qualification (20%).

Neighbours

Every nearby town is older than Underwood

Nearby built-up areas coloured by median age, Census 2021. Tap a town for its page.

LangstoneUndy and MagorCaerleonPonthirNewportRogietCaer-wentUnderwood

under 3838–4444–5050–5656+

Town	People	Away	Median age	65+	Homes with children
Underwood	2,134	—	36.2	15%	31%
Langstone	2,912	0.9 mi	45.3	20%	32%
Undy and Magor	5,742	3 mi	45.9	20%	28%
Caerleon	7,329	3.6 mi	47.9	25%	26%
Ponthir	1,260	4.2 mi	55.1	29%	23%
Newport	130,882	4.5 mi	37.4	16%	31%
Rogiet	1,791	4.7 mi	41.1	16%	32%
Caer-went	1,523	5.4 mi	45.4	21%	30%

More about Underwood’s residents

Health, work and homes have their own pages

Health C⁺Life expectancy, early deaths and Census health, adjusted for age Work & commute C⁻Income, the claimant count, jobs and how people get to work Cost of living BOwners and renters, prices, rents and council tax SchoolsEvery primary and secondary, with results and inspections

How to read these numbers

What this data can and can’t tell you

“Gwent’s towns” and “Wales’s towns” mean their built-up areas. Census comparisons pool every built-up area in Gwent (or Wales), summed the same way as Underwood’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 Underwood’s residents

What is the population of Underwood?

The 2021 Census counted 2,134 people in Underwood’s built-up area.

What is the average age in Underwood?

The median age was 36.2 at the 2021 Census. 11% of residents were 15 to 24 and 15% were 65 or over.

How diverse is Underwood?

87% of residents described themselves as White British in 2021, against 90% across Wales’s towns and 91% across Gwent’s towns. 4.9% were born outside the UK.

What religion are people in Underwood?

53% said they had no religion and 39% that they were Christian at the 2021 Census; 0.8% were Muslim and 5.8% didn’t answer.

Is Underwood good for families?

31% of households had dependent children in 2021, against 27% across Wales’s towns. Schools are on Underwood’s schools page.

How many people speak Welsh in Underwood?

136 residents aged 3 and over, 6.6%, said they can speak Welsh at the 2021 Census, against 16% across Welsh towns.

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, TS032). 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.