Llanrumney
vs Pentwyn
Pentwyn has the younger population: 19% of residents are aged 15–29, against 18% in Llanrumney. Homes in Llanrumney sold for a median of £230,000, 10% above Pentwyn. Pentwyn has more green space nearby (29% within 500 m, against 25%).
People
Llanrumney has 11,602 residents in 4,808 households; Pentwyn has 16,197 in 6,516. The share of residents aged 65 and over is about the same in both (15% and 16%). The share of people living alone is about the same in both (29% and 30%).
Homes and prices
The most common type of home is semi-detached houses in Llanrumney (45%) and terraced houses in Pentwyn (46%). Pentwyn has the higher share of owner-occupied homes: 58%, 3.5 percentage points more than Llanrumney (Cardiff: 58%). Pentwyn has the higher share of private renting: 16%, 1.6 percentage points more than Llanrumney (Cardiff: 24%). Over two years, homes sold for a median of £230,000 in Llanrumney and £210,000 in Pentwyn, against £270,000 across Cardiff.
Surroundings
Pentwyn has the higher share of land within 500 m that is green space: 29%, 4.2 percentage points more than Llanrumney (Cardiff: 19%). A typical postcode has 69 everyday shops and services within a 15-minute walk in Llanrumney, and 75 in Pentwyn. The typical postcode is 294 m from the nearest school in Llanrumney and 242 m in Pentwyn. The typical postcode is 3,968 m from the nearest tram stop or railway station in Llanrumney and 2,198 m in Pentwyn. Gigabit-capable broadband reaches 98% of premises in Llanrumney and 92% in Pentwyn.
Safety
Over 12 months, police recorded 118 crimes and incidents per 1,000 residents in Llanrumney and 76 in Pentwyn, against 118 across Cardiff. Police.uk records crimes by approximate location, not by where victims or offenders live. Busy streets, shops, stations and nightlife record more. Figures are counts, not a measure of personal risk.
Sources: Census 2021 (ONS) · HM Land Registry Price Paid Data · official school registers · © OpenStreetMap contributors · Environment Agency · data.police.uk, 12 months to Aug 2026 · Ofcom Connected Nations
In brief.
Each ward in a few lines, from its own page.
Llanrumney is one of 28 wards in Cardiff, home to 11,602 people in 4,808 households (Census 2021). Homes sold for a median of £230,000 over the past two years, 15% below the Cardiff median. On average 25% of the land within 500 metres of a home postcode is green space — 34% above the Cardiff average.
Pentwyn is one of 28 wards in Cardiff, home to 16,197 people in 6,516 households (Census 2021). Homes sold for a median of £210,000 over the past two years, 22% below the Cardiff median. On average 29% of the land within 500 metres of a home postcode is green space — 57% above the Cardiff average.
More comparisons.
Llanrumney and Pentwyn next to other wards of Cardiff.