Hiroshima
338 km²
Osaka
2,212 km²
City Map Compare/Hiroshima vs Osakavs
vs
5 km
Osaka covers 2,212 km² of contiguous built-up land, 6.5× the built-up area of Hiroshima (338 km²).
| Hiroshima | Osaka | |
|---|---|---|
| Urban area | Hiroshima | Osaka–Kobe–Kyoto |
| Population (2025) | 1.15 million | 12.7 million |
| Built-up area | 338 km² | 2,212 km² |
| Density | 3,403 /km² | 5,721 /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.