Houston is about 14 times bigger than Hayward.

Hayward (map shows its 16 named neighbourhoods; the area covers the whole city) is approximately 119 sq km, while Houston is approximately 1,659 sq km, making Houston 1,298% larger than Hayward.
Tip: This to-scale comparison of Hayward vs. Houston uses the Mercator projection, which distorts the size of regions near the poles.
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