Indianapolis is about 6 times smaller than Istanbul.

Istanbul is approximately 5,343 sq km, while Indianapolis is approximately 935 sq km, making Indianapolis 17.5% the size of Istanbul.
Tip: This to-scale comparison of Istanbul vs. Indianapolis 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.