Cincinnati is about 2.1 times smaller than Vienna.

Vienna is approximately 415 sq km, while Cincinnati is approximately 202 sq km, making Cincinnati 48.65% the size of Vienna.
Tip: This to-scale comparison of Vienna vs. Cincinnati 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.