Aurora is about 2 times bigger than Seattle.

Seattle is approximately 217 sq km, while Aurora (map shows its 53 named neighbourhoods; the area covers the whole city) is approximately 425 sq km, making Aurora 96% larger than Seattle.
Tip: This to-scale comparison of Seattle 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.