Boston is about 1.6 times smaller than Fremont.

Fremont (map shows its 28 named neighbourhoods; the area covers the whole city) is approximately 202 sq km, while Boston is approximately 124 sq km, making Boston 61.3% the size of Fremont.
Tip: This to-scale comparison of Fremont vs. Boston 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.