Turks and Caicos Islands is about 5 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Turks and Caicos Islands is approximately 948 sq km, making Turks and Caicos Islands 436% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (543,437 fewer people live in Turks and Caicos Islands).
Tip: This to-scale comparison of District of Columbia vs. Turks and Caicos Islands uses the Mercator projection, which distorts the size of regions near the poles.