London
1,649 km²
St. Helier
24 km²
City Map Compare/London vs St. Heliervs
vs
2 km
London covers 1,649 km² of contiguous built-up land, 69× the built-up area of St. Helier (24 km²).
| London | St. Helier | |
|---|---|---|
| Urban area | London | St. Helier |
| Population (2025) | 10.4 million | 58,333 |
| Built-up area | 1,649 km² | 24 km² |
| Density | 6,312 /km² | 2,431 /km² |
Urban area = contiguous built-up land and the people living in it in 2025, drawn the same way for every city regardless of administrative boundaries. Source: GHSL Urban Centre Database R2024A, European Commission, Joint Research Centre (CC BY 4.0); some names adjusted to the city names people use, and country attribution follows the dataset.