Washington is about 974 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Washington is approximately 172,348 sq km, making Washington 97,272% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (6.1 million more people live in Washington).
Tip: This to-scale comparison of District of Columbia vs. Washington uses the Mercator projection, which distorts the size of regions near the poles.