Washington is about 1,915 times bigger than Fort Lauderdale.

Fort Lauderdale (excluding the city's 9.9 sq km of water area) is approximately 90 sq km, while Washington is approximately 172,348 sq km, making Washington 191,398% larger than Fort Lauderdale.
Tip: This to-scale comparison of Fort Lauderdale vs. Washington uses the Mercator projection, which distorts the size of regions near the poles.