Washington is about 43 times bigger than Cabo Verde.

Cabo Verde is approximately 4,033 sq km, while Washington is approximately 172,348 sq km, making Washington 4,173% larger than Cabo Verde. Meanwhile, the population of Cabo Verde is ~596,707 people (6.1 million more people live in Washington).
Tip: This to-scale comparison of Cabo Verde vs. Washington uses the Mercator projection, which distorts the size of regions near the poles.