Istanbul
1,269 km²
Sofia
201 km²
City Map Compare/Istanbul vs Sofiavs
vs
5 km
Istanbul covers 1,269 km² of contiguous built-up land, 6.3× the built-up area of Sofia (201 km²).
| Istanbul | Sofia | |
|---|---|---|
| Urban area | Istanbul | Sofia |
| Population (2025) | 14.2 million | 1.07 million |
| Built-up area | 1,269 km² | 201 km² |
| Density | 11,198 /km² | 5,314 /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.