Indianapolis is about 2.2 times bigger than Vienna.

Vienna is approximately 415 sq km, while Indianapolis is approximately 935 sq km, making Indianapolis 125% larger than Vienna.
Tip: This to-scale comparison of Vienna 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.