District of Columbia is about 1,519 times smaller than New Zealand.

New Zealand is approximately 268,838 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.07% the size of New Zealand. Meanwhile, the population of New Zealand is ~5.1 million people (4.5 million fewer people live in District of Columbia).
Tip: This to-scale comparison of New Zealand vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.