Beaverton is about 3.1 times smaller than Washington.

Washington is approximately 158 sq km, while Beaverton (map shows its 13 named neighbourhoods; the area covers the whole city) is approximately 51 sq km, making Beaverton 32.29% the size of Washington.
Tip: This to-scale comparison of Washington vs. Beaverton uses the Mercator projection, which distorts the size of regions near the poles.
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