District of Columbia is about 320 times smaller than Croatia.

Croatia is approximately 56,594 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.31% the size of Croatia. Meanwhile, the population of Croatia is ~4.2 million people (3.6 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Croatia vs. District of Columbia 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.