Seattle is about 3.9 times bigger than Chapel Hill.

Chapel Hill is approximately 56 sq km, while Seattle is approximately 217 sq km, making Seattle 287% larger than Chapel Hill.
Tip: This to-scale comparison of Chapel Hill 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.