Washington is about 2.5 times smaller than Denver.

Denver is approximately 396 sq km, while Washington is approximately 158 sq km, making Washington 39.93% the size of Denver.
Tip: This to-scale comparison of Denver 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.