Miami is about 1.8 times bigger than Beaverton.

Beaverton (map shows its 13 named neighbourhoods; the area covers the whole city) is approximately 51 sq km, while Miami is approximately 92 sq km, making Miami 81% larger than Beaverton.
Tip: This to-scale comparison of Beaverton vs. Miami uses the Mercator projection, which distorts the size of regions near the poles.
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