Vienna is about 2.2 times smaller than Indianapolis.

Indianapolis is approximately 935 sq km, while Vienna is approximately 415 sq km, making Vienna 44.36% the size of Indianapolis.
Tip: This to-scale comparison of Indianapolis vs. Vienna 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.