Jacksonville is about 16 times bigger than Boston.

Boston is approximately 124 sq km, while Jacksonville (map shows its 197 named neighbourhoods; the area covers the whole city) is approximately 1,935 sq km, making Jacksonville 1,461% larger than Boston.
Tip: This to-scale comparison of Boston vs. Jacksonville 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.