District of Columbia is about 71 times smaller than Connecticut.

Connecticut is approximately 12,548 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 1.41% the size of Connecticut. Meanwhile, the population of Connecticut is ~3.6 million people (3.0 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Connecticut vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.