Palau is about 2.6 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Palau is approximately 459 sq km, making Palau 159% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (580,028 fewer people live in Palau).
Tip: This to-scale comparison of District of Columbia vs. Palau uses the Mercator projection, which distorts the size of regions near the poles.