Seychelles is about 2.6 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Seychelles is approximately 455 sq km, making Seychelles 157% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (504,706 fewer people live in Seychelles).
Tip: This to-scale comparison of District of Columbia vs. Seychelles uses the Mercator projection, which distorts the size of regions near the poles.