Washington is about 3.1 times smaller than Prague.

Prague is approximately 496 sq km, while Washington is approximately 158 sq km, making Washington 31.91% the size of Prague.
Tip: This to-scale comparison of Prague vs. Washington 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.