Sydney is about 8 times smaller than Cincinnati.

Cincinnati is approximately 202 sq km, while Sydney is approximately 27 sq km, making Sydney 13.23% the size of Cincinnati.
Tip: This to-scale comparison of Cincinnati vs. Sydney 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.