Miami is about 4.6 times smaller than Aurora.

Aurora (map shows its 53 named neighbourhoods; the area covers the whole city) is approximately 425 sq km, while Miami is approximately 92 sq km, making Miami 21.75% the size of Aurora.
Tip: This to-scale comparison of Aurora vs. Miami 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.