Seattle is about 1.2 times smaller than Edinburgh.

Edinburgh (map shows its 30 named neighbourhoods; the area covers the whole city) is approximately 259 sq km, while Seattle is approximately 217 sq km, making Seattle 83.9% the size of Edinburgh.
Tip: This to-scale comparison of Edinburgh 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.