Saint Lucia is about 280 times smaller than Washington.

Washington is approximately 172,348 sq km, while Saint Lucia is approximately 616 sq km, making Saint Lucia 0.36% the size of Washington. Meanwhile, the population of Washington is ~6.7 million people (6.6 million fewer people live in Saint Lucia).
Tip: This to-scale comparison of Washington vs. Saint Lucia uses the Mercator projection, which distorts the size of regions near the poles.