Aurora is about 1.2 times smaller than Warsaw.

Warsaw is approximately 517 sq km, while Aurora (map shows its 53 named neighbourhoods; the area covers the whole city) is approximately 425 sq km, making Aurora 82.16% the size of Warsaw.
Tip: This to-scale comparison of Warsaw vs. Aurora 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.