Istanbul is about 90 times bigger than Pasadena.

Pasadena is approximately 59 sq km, while Istanbul is approximately 5,343 sq km, making Istanbul 8,885% larger than Pasadena.
Tip: This to-scale comparison of Pasadena vs. Istanbul 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.