Hayward is about 14 times smaller than Houston.

Houston is approximately 1,659 sq km, while Hayward (map shows its 16 named neighbourhoods; the area covers the whole city) is approximately 119 sq km, making Hayward 7.15% the size of Houston.
Tip: This to-scale comparison of Houston vs. Hayward uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.