District of Columbia is about 115 times smaller than Slovenia.

Slovenia is approximately 20,273 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.87% the size of Slovenia. Meanwhile, the population of Slovenia is ~2.1 million people (1.5 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Slovenia 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.