Saint Vincent and the Grenadines is about 2.2 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Saint Vincent and the Grenadines is approximately 389 sq km, making Saint Vincent and the Grenadines 120% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (500,754 fewer people live in Saint Vincent and the Grenadines).
Tip: This to-scale comparison of District of Columbia vs. Saint Vincent and the Grenadines uses the Mercator projection, which distorts the size of regions near the poles.