Washington is about 1.3 times bigger than Hayward.

Hayward (map shows its 16 named neighbourhoods; the area covers the whole city) is approximately 119 sq km, while Washington is approximately 158 sq km, making Washington 33% larger than Hayward.
Tip: This to-scale comparison of Hayward vs. Washington uses the Mercator projection, which distorts the size of regions near the poles.
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