District of Columbia is about 7 times bigger than DFW Airport.

DFW Airport is approximately 27 km² (10 sq mi), while District of Columbia is approximately 177 sq km, making District of Columbia 568% larger than DFW Airport.
Tip: This to-scale comparison of DFW Airport vs. District of Columbia 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.