District of Columbia is about 4.9 times bigger than Norfolk Island.

Norfolk Island is approximately 36 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 392% larger than Norfolk Island. Meanwhile, the population of Norfolk Island is ~1,748 people (599,975 more people live in District of Columbia).
Tip: This to-scale comparison of Norfolk Island vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.