Place CheckerOfficial local evidence

Census 2021 neighbourhood · W02000289

Treharris & Trelewis

Treharris & Trelewis is a Census neighbourhood of about 8,681 residents in Merthyr Tydfil. This is a statistical area, not an administrative boundary or a postcode district.

Area evidence brief for Merthyr Tydfil
8,681

Usual residents

ONS Census 2021 · MSOA

3,706

Households

ONS Census 2021 · MSOA

880.2

Residents per km²

ONS Census 2021 · MSOA

72.9%

Households owning their home

ONS Census 2021 · tenure

17.2%

Households with no car or van

ONS Census 2021 · car availability

26.0%

Adults with a degree or above

ONS Census 2021 · qualifications

Neighbourhoods most like this one

Closest matches elsewhere in England and Wales, across 14 Census themes. Similarity is statistical, not a recommendation, and says nothing about how anywhere feels to live in.

Blackwood, Caerphilly7,145 residents · 73.9% owned · 16.3% no carOakdale & Pen-twyn, Caerphilly9,520 residents · 74.4% owned · 14.1% no carSarn, Bryn-coch & Bryncethin, Bridgend6,499 residents · 67.2% owned · 18.6% no carBedwas & Trethomas, Caerphilly6,767 residents · 70.2% owned · 20.0% no carHengoed & Maesycwmer, Caerphilly7,931 residents · 70.9% owned · 16.8% no carTonyrefail West, Rhondda Cynon Taf10,173 residents · 70.9% owned · 18.5% no car

Most similar within Merthyr Tydfil

The closest matches in the same local authority.

Cefncoedycymer, Heolgerrig & Park, Merthyr Tydfil8,331 residents · 76.9% owned · 15.9% no car

Census 2021 · Census neighbourhood (MSOA)

Life in Treharris & Trelewis

People, households and homes at the stated Census geography. These describe the 2021 population, not the occupants of a particular home.

Tenure

Owned72.9%
2,703 households
Private rented14.2%
528 households
Social rented12.7%
469 households
Shared ownership0.2%
6 households
Lives rent free0%
0 households
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Accommodation type

Terraced40.2%
1,490 households
Semi-detached29.7%
1,101 households
Detached24.1%
893 households
In a purpose-built block of flats or tenement4.1%
153 households
A caravan or other mobile or temporary structure0.7%
27 households
In a commercial building, for example, in an office building, hotel or over a shop0.5%
20 households
Part of a converted or shared house, including bedsits0.4%
13 households
Part of another converted building, for example, former school, church or warehouse0.2%
7 households
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Car or van availability

1 car or van in household40.4%
1,496 households
2 cars or vans in household31.4%
1,164 households
No cars or vans in household17.2%
638 households
3 or more cars or vans in household10.9%
405 households
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Number of bedrooms

3 bedrooms58.2%
2,156 households
2 bedrooms20.4%
756 households
4 or more bedrooms19.2%
712 households
1 bedroom2.2%
82 households
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Household composition

Single family household68.6%
2,542 households
One-person household27.2%
1,009 households
Other household types4.1%
152 households
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Household size

2 people in household36.6%
1,355 households
1 person in household27.2%
1,009 households
3 people in household18.5%
684 households
4 people in household13.2%
489 households
5 people in household3.5%
129 households
6 people in household0.9%
32 households
7 people in household0.1%
5 households
8 or more people in household0.1%
2 households
0 people in household0%
0 households
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Age

Under 1516.8%
1,456 residents
15–2916.7%
1,447 residents
30–4419.8%
1,717 residents
45–6427.1%
2,354 residents
65 and over19.6%
1,705 residents
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Ethnic group

White98.1%
8,515 residents
Asian, Asian British or Asian Welsh0.9%
76 residents
Mixed or Multiple ethnic groups0.8%
67 residents
Other ethnic group0.1%
12 residents
Black, Black British, Black Welsh, Caribbean or African0.1%
8 residents
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Highest qualification

Level 4 qualifications or above26%
1,857 residents aged 16 and over
No qualifications23.9%
1,701 residents aged 16 and over
Level 3 qualifications17.5%
1,247 residents aged 16 and over
Level 2 qualifications14.8%
1,053 residents aged 16 and over
Level 1 and entry level qualifications9.8%
701 residents aged 16 and over
Apprenticeship5.6%
402 residents aged 16 and over
Other qualifications2.4%
170 residents aged 16 and over
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Economic activity

Economically active (excluding full-time students)57%
4,065 residents aged 16 and over
Economically inactive41.3%
2,947 residents aged 16 and over
Economically active and a full-time student1.7%
120 residents aged 16 and over
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Occupational class (NS-SeC)

L4, L5 and L6 Lower managerial, administrative and professional occupations19.3%
1,375 residents aged 16 and over
L12 Semi-routine occupations13.9%
992 residents aged 16 and over
L13 Routine occupations13.7%
979 residents aged 16 and over
L7 Intermediate occupations12.8%
912 residents aged 16 and over
L14.1 and L14.2 Never worked and long-term unemployed9.4%
673 residents aged 16 and over
L8 and L9 Small employers and own account workers8.7%
622 residents aged 16 and over
L1, L2 and L3 Higher managerial, administrative and professional occupations8.4%
598 residents aged 16 and over
L10 and L11 Lower supervisory and technical occupations8.1%
578 residents aged 16 and over
L15 Full-time students5.6%
401 residents aged 16 and over
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

General health

Very good health45.4%
3,942 residents
Good health31.3%
2,714 residents
Fair health14.9%
1,292 residents
Bad health6.4%
559 residents
Very bad health2%
174 residents
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Disability

Not disabled under the Equality Act76.9%
6,674 residents
Disabled under the Equality Act23.1%
2,007 residents
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Household deprivation

Household is not deprived in any dimension43.9%
1,626 households
Household is deprived in one dimension32.8%
1,213 households
Household is deprived in two dimensions17.9%
661 households
Household is deprived in three dimensions5.2%
194 households
Household is deprived in four dimensions0.2%
7 households
Treharris & Trelewis · Census neighbourhood (MSOA) · ONS Census 2021

Each percentage uses its Census table’s own total. Rounding and source categories can affect totals. ONS Census data · OGL v3.0.

How the similarity is worked out

Alike on the Census, which is not the same as alike to live in.

Every neighbourhood is described by its shares across the Census themes above — tenure, housing, cars, household make-up, age, ethnic group, qualifications, work, health and deprivation — each theme weighted equally, which is the approach ONS takes in its own Output Area Classification. The neighbourhoods listed are the closest on those numbers, published in full rather than folded into a score. Nothing here measures schools, crime, prices or what a place is like to be in, and a close match is a statistical fact rather than a suggestion to move.

Browse every neighbourhood in Merthyr Tydfil

Evidence ledger

Source and date are part of the record.

Shared catalogue checked 2026-08-28: 88 candidate data layers listed. Catalogue presence is not publication approval; only separately approved public projections may be shown.