Staten Island is about 1.5 times smaller than Seattle.

Seattle is approximately 217 sq km, while Staten Island is approximately 149 sq km, making Staten Island 68.56% the size of Seattle.
Tip: This to-scale comparison of Seattle vs. Staten Island 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.