Williamsburg is about 1.7 times bigger than Key West.

Key West (area of Key West island) is approximately 14 sq km, while Williamsburg (map shows its 52 named neighbourhoods; the area covers the whole city) is approximately 23 sq km, making Williamsburg 70% larger than Key West.
Tip: This to-scale comparison of Key West vs. Williamsburg uses the Mercator projection, which distorts the size of regions near the poles.
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