Changchun
411 km²
Seoul
2,282 km²
City Map Compare/Changchun vs Seoulvs
vs
5 km
Seoul covers 2,282 km² of contiguous built-up land, 5.6× the built-up area of Changchun (411 km²).
| Changchun | Seoul | |
|---|---|---|
| Urban area | Changchun | Seoul |
| Population (2025) | 3.52 million | 22.3 million |
| Built-up area | 411 km² | 2,282 km² |
| Density | 8,564 /km² | 9,755 /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.