San Diego
778 km²
Tijuana
294 km²
City Map Compare/San Diego vs Tijuanavs
vs
5 km
San Diego covers 778 km² of contiguous built-up land, 2.6× the built-up area of Tijuana (294 km²).
| San Diego | Tijuana | |
|---|---|---|
| Urban area | San Diego | Tijuana |
| Population (2025) | 1.98 million | 1.54 million |
| Built-up area | 778 km² | 294 km² |
| Density | 2,541 /km² | 5,232 /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.