Connecticut is about 71 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Connecticut is approximately 12,548 sq km, making Connecticut 6,989% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (3.0 million more people live in Connecticut).
Tip: This to-scale comparison of District of Columbia vs. Connecticut uses the Mercator projection, which distorts the size of regions near the poles.