Dublin is about 4.9 times smaller than Columbus.

Columbus is approximately 574 sq km, while Dublin is approximately 118 sq km, making Dublin 20.53% the size of Columbus.
Tip: This to-scale comparison of Columbus vs. Dublin 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.