Seattle is about 2.6 times smaller than Columbus.

Columbus is approximately 574 sq km, while Seattle is approximately 217 sq km, making Seattle 37.87% the size of Columbus.
Tip: This to-scale comparison of Columbus 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.