Seattle is about 2 times smaller than Aurora.

Aurora (map shows its 53 named neighbourhoods; the area covers the whole city) is approximately 425 sq km, while Seattle is approximately 217 sq km, making Seattle 51.14% the size of Aurora.
Tip: This to-scale comparison of Aurora vs. Seattle 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.