San Jose is about 30 times smaller than Istanbul.

Istanbul is approximately 5,343 sq km, while San Jose is approximately 180 sq km, making San Jose 3.37% the size of Istanbul.
Tip: This to-scale comparison of Istanbul vs. San Jose uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.