Puerto Rico is about 51 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Puerto Rico is approximately 9,104 sq km, making Puerto Rico 5,044% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (2.5 million more people live in Puerto Rico).
Tip: This to-scale comparison of District of Columbia vs. Puerto Rico 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.