Istanbul is about 37 times bigger than Dayton.

Dayton is approximately 145 sq km, while Istanbul is approximately 5,343 sq km, making Istanbul 3,596% larger than Dayton.
Tip: This to-scale comparison of Dayton vs. Istanbul 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.