Columbus is about 1.5 times smaller than Dallas.

Dallas is approximately 880 sq km, while Columbus is approximately 574 sq km, making Columbus 65.23% the size of Dallas.
Tip: This to-scale comparison of Dallas vs. Columbus 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.