Malta is about 1.8 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Malta is approximately 316 sq km, making Malta 79% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (137,537 fewer people live in Malta).
Tip: This to-scale comparison of District of Columbia vs. Malta uses the Mercator projection, which distorts the size of regions near the poles.