Cincinnati is about 8 times smaller than London.

London (including the 32 boroughs of greater London) is approximately 1,572 sq km, while Cincinnati is approximately 202 sq km, making Cincinnati 12.84% the size of London.
Tip: This to-scale comparison of London 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.