District of Columbia is about 474 times smaller than Austria.

Austria is approximately 83,871 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.21% the size of Austria. Meanwhile, the population of Austria is ~8.9 million people (8.3 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Austria vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.