Jacksonville is about 1.2 times bigger than Bangkok.

Bangkok is approximately 1,569 sq km, while Jacksonville (map shows its 197 named neighbourhoods; the area covers the whole city) is approximately 1,935 sq km, making Jacksonville 23% larger than Bangkok.
Tip: This to-scale comparison of Bangkok 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.