Kiribati is about 4.6 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Kiribati is approximately 811 sq km, making Kiribati 358% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (487,534 fewer people live in Kiribati).
Tip: This to-scale comparison of District of Columbia vs. Kiribati uses the Mercator projection, which distorts the size of regions near the poles.